Pub Date : 2021-01-01DOI: 10.22201/IGEOF.00167169P.2021.60.1.2037
Christian Yamir Cordero Vazquez, Omar Delgado Rodríguez, Héctor José Peinado Guevara, María de los Ángeles Ladrón de Guevara Torres, Jonathan Ossiel Hernández Ramos, Víctor Manuel Peinado Guevara
The knowledge of agricultural soil properties is crucial for the auspicious selection of crop, irrigation and fertilization types. This study contains the results of the field and laboratory application of electrical measurements used to obtain fines content, porosity, hydraulic conductivity and cation exchange capacity (CEC) in three agricultural plots for the purpose of growing barley. The values of fines content were attained using electrical measurements in laboratory soil samples and Ryjov's algorithm, which is comparable to the calculated values from textural analyses of Bouyoucos. In agricultural plot A, an Electrical Resistivity Tomography (ERT) profile, along with measurements of soil moisture and salinity, show high-resolution outcomes to determine soil properties, these are related to a clear image of soil thickness, as well as the identification of horizons. The Electrical Profiling (EP) survey conducted in the three plots showed higher productivity than the ERT method, resulting in soil properties maps. The plots display A-lowest, B-moderate and C-higher range of CEC values. This result conforms to crop yields per hectare and the fertility analysis carried out on each land plot, which confirms not only the effectiveness of the EP method and Ryjov's algorithm, but also their purpose for the study of agricultural soil properties.
{"title":"Determination of Soil Properties from Electrical Measurements in Agricultural Plots, Villa de Arriaga, San Luis Potosí, Mexico","authors":"Christian Yamir Cordero Vazquez, Omar Delgado Rodríguez, Héctor José Peinado Guevara, María de los Ángeles Ladrón de Guevara Torres, Jonathan Ossiel Hernández Ramos, Víctor Manuel Peinado Guevara","doi":"10.22201/IGEOF.00167169P.2021.60.1.2037","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.1.2037","url":null,"abstract":"The knowledge of agricultural soil properties is crucial for the auspicious selection of crop, irrigation and fertilization types. This study contains the results of the field and laboratory application of electrical measurements used to obtain fines content, porosity, hydraulic conductivity and cation exchange capacity (CEC) in three agricultural plots for the purpose of growing barley. The values of fines content were attained using electrical measurements in laboratory soil samples and Ryjov's algorithm, which is comparable to the calculated values from textural analyses of Bouyoucos. In agricultural plot A, an Electrical Resistivity Tomography (ERT) profile, along with measurements of soil moisture and salinity, show high-resolution outcomes to determine soil properties, these are related to a clear image of soil thickness, as well as the identification of horizons. The Electrical Profiling (EP) survey conducted in the three plots showed higher productivity than the ERT method, resulting in soil properties maps. The plots display A-lowest, B-moderate and C-higher range of CEC values. This result conforms to crop yields per hectare and the fertility analysis carried out on each land plot, which confirms not only the effectiveness of the EP method and Ryjov's algorithm, but also their purpose for the study of agricultural soil properties.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"9 1","pages":"76-100"},"PeriodicalIF":0.4,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84503017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.22201/IGEOF.00167169P.2021.60.1.2011
Giovanni Aldana-Gutiérrez, A. C. Ruiz-Fernández, Libia Hascibe Pérez-Bernal, Francisco Flores-Verdugo, Tomasa Cuellar-Martinez, Joan-Albert Sánchez-Cabeza
Los manglares, junto con los pastizales marinos y las marismas, se encuentran entre los ecosistemas costeros conocidos como ecosistemas de carbono azul. Estos ecosistemas son sumideros naturales de carbono, relevantes para la mitigacio?n del calentamiento global debido a que son capaces de secuestrar importantes cantidades de CO2 para produccio?n de biomasa, asi? como de almacenar materia orga?nica en sus sedimentos durante muy largo plazo. Se presentan los resultados de la evaluacio?n temporal de los flujos (g m-2 an?o-1) e inventarios (Mg ha-1) de carbono orga?nico (Corg) en nu?cleos sedimentarios recolectados en a?reas de manglar asociados a la laguna costera Estero de Uri?as (Mazatla?n, Sinaloa). La estrategia de trabajo incluyo? la caracterizacio?n geoqui?mica de los sedimentos mediante el ana?lisis de composicio?n elemental por espectrometri?a de fluorescencia de rayos-X para evaluar cambios en el origen de los sedimentos (terri?geno o marino); la determinacio?n de la distribucio?n de taman?o de grano para evaluar cambios en la hidrodina?mica de los sitios de estudio; y la cuantificacio?n de las concentraciones de Corg mediante un analizador elemental. Por u?ltimo, se presenta una estimacio?n del costo econo?mico de los impactos de las emisiones potenciales de CO2 como consecuencia de la oxidacio?n del Corg, debido a las potenciales perturbaciones de los sitios de estudio. La informacio?n generada representa una componente ma?s de los beneficios econo?micos de la preservacio?n de los ecosistemas de manglar, relevante en los planes de manejo de humedales costeros, cuya conservacio?n contribuye a la reduccio?n de emisiones de gases de efecto invernadero, y podri?a ser aprovechada como parte de una estrategia de adaptacio?n al cambio clima?tico basada en ecosistemas, en zonas tropicales y subtropicales alrededor del mundo.
{"title":"Flujos e inventarios de carbono azul en manglares asociados a una laguna costera antropizada","authors":"Giovanni Aldana-Gutiérrez, A. C. Ruiz-Fernández, Libia Hascibe Pérez-Bernal, Francisco Flores-Verdugo, Tomasa Cuellar-Martinez, Joan-Albert Sánchez-Cabeza","doi":"10.22201/IGEOF.00167169P.2021.60.1.2011","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.1.2011","url":null,"abstract":"Los manglares, junto con los pastizales marinos y las marismas, se encuentran entre los ecosistemas costeros conocidos como ecosistemas de carbono azul. Estos ecosistemas son sumideros naturales de carbono, relevantes para la mitigacio?n del calentamiento global debido a que son capaces de secuestrar importantes cantidades de CO2 para produccio?n de biomasa, asi? como de almacenar materia orga?nica en sus sedimentos durante muy largo plazo. Se presentan los resultados de la evaluacio?n temporal de los flujos (g m-2 an?o-1) e inventarios (Mg ha-1) de carbono orga?nico (Corg) en nu?cleos sedimentarios recolectados en a?reas de manglar asociados a la laguna costera Estero de Uri?as (Mazatla?n, Sinaloa). La estrategia de trabajo incluyo? la caracterizacio?n geoqui?mica de los sedimentos mediante el ana?lisis de composicio?n elemental por espectrometri?a de fluorescencia de rayos-X para evaluar cambios en el origen de los sedimentos (terri?geno o marino); la determinacio?n de la distribucio?n de taman?o de grano para evaluar cambios en la hidrodina?mica de los sitios de estudio; y la cuantificacio?n de las concentraciones de Corg mediante un analizador elemental. Por u?ltimo, se presenta una estimacio?n del costo econo?mico de los impactos de las emisiones potenciales de CO2 como consecuencia de la oxidacio?n del Corg, debido a las potenciales perturbaciones de los sitios de estudio. La informacio?n generada representa una componente ma?s de los beneficios econo?micos de la preservacio?n de los ecosistemas de manglar, relevante en los planes de manejo de humedales costeros, cuya conservacio?n contribuye a la reduccio?n de emisiones de gases de efecto invernadero, y podri?a ser aprovechada como parte de una estrategia de adaptacio?n al cambio clima?tico basada en ecosistemas, en zonas tropicales y subtropicales alrededor del mundo.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"26 1","pages":"13-30"},"PeriodicalIF":0.4,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90801366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.22201/IGEOF.00167169P.2021.60.1.2026
I. Arroyo, Lepolt Linkimer
Entre agosto y noviembre del 2018 ocurrio? una secuencia de sismos en el golfo Dulce, cerca de la ciudad de Golfito, al sureste de Costa Rica. El sismo principal tuvo una magnitud momento (Mw) 6.1 y fue sentido en Costa Rica y el oeste de Panama? con intensidades Mercalli Modificada ma?ximas de VI. En esta regio?n, la placa del Coco, junto con la cordillera ocea?nica del Coco, se subducen bajo la microplaca de Panama?. Usando los registros de la Red Sismolo?gica Nacional de Costa Rica, en este arti?culo se presenta la relocalizacio?n de esa sismicidad con la te?cnica de diferencia doble y se analiza la distribucio?n temporal y geogra?fica de la sismicidad, junto con el mecanismo focal e intensidades de los sismos de mayor taman?o. Los resultados muestran que la secuencia ocurrio? en la zona sismoge?nica interplacas, dentro del a?rea de ruptura del terremoto de Golfito de 1983 (Mw 7.4), entre 12 y 27 km de profundidad, en un agrupamiento buzante 35o al noreste bajo el golfo Dulce. Con base principalmente en estos resultados y en secuencias si?smicas previas, se propone que en el Sureste de Costa Rica la zona sismoge?nica tiene dimensiones de ~160 x 45 km. Adema?s, durante la secuencia de Golfito, ocurrio? la ruptura de una falla inversa (Mw 5.9) dentro de la placa del Coco bajo el golfo Dulce, asi? como la ruptura en fallas de rumbo dextrales en la microplaca de Panama? (Mw 4.6-5.6), a 50 km del golfo Dulce. El estudio de la sismicidad interplacas interciclo contribuye con el conocimiento de la dina?mica de la zona sismoge?nica interplacas. Esto es de particular importancia para el Sureste de Costa Rica, donde se han generado al menos seis terremotos destructivos con Mw > 7 desde 1803, lo que implica el peligro inminente de un pro?ximo terremoto en esta zona.
2018年8月至11月发生?哥斯达黎加东南部戈尔菲托镇附近的杜尔塞湾发生了一系列地震。主要地震的力矩级(Mw)为6.1级，哥斯达黎加和巴拿马西部都有震感。麦卡利的强度改变了吗?ximas de VI，在这个地区?n，可可板块和ocea山脉?在巴拿马的微板下。使用Sismolo网络的记录?哥斯达黎加国家警察，在这篇文章里?搬迁是在哪里提出的?地震活动与te?双差技术和分布分析?n时间和地理?地震活动，以及较大地震的震源机制和强度。结果显示序列发生了?在地震区?板间nica，在a?1983年Golfito地震(Mw 7.4)破裂的rea，深度为12至27公里，位于墨西哥湾东北部35度的震颤群中。主要基于这些结果和序列是吗?在哥斯达黎加东南部的地震带?nica的尺寸约为160 x 45公里。Adema ?s，在高尔夫球序列中，发生了什么?在杜尔斯湾的可可板块内，反向断层(Mw 5.9)的破裂，对吗?就像巴拿马微板块右旋向断层破裂一样?(Mw 4.6-5.6)，距杜尔斯湾50公里。对周期间板间地震活动的研究有助于了解dina?地震带的云母?但我不会interplacas。这对哥斯达黎加东南部尤其重要，自1803年以来，那里至少发生了6次Mw > 7级破坏性地震，这意味着地震发生的危险迫在眉睫。这个地区发生了下一次地震。
{"title":"Geometría de la zona sismogénica interplacas en el Sureste de Costa Rica a la luz de la secuencia de Golfito del 2018","authors":"I. Arroyo, Lepolt Linkimer","doi":"10.22201/IGEOF.00167169P.2021.60.1.2026","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.1.2026","url":null,"abstract":"Entre agosto y noviembre del 2018 ocurrio? una secuencia de sismos en el golfo Dulce, cerca de la ciudad de Golfito, al sureste de Costa Rica. El sismo principal tuvo una magnitud momento (Mw) 6.1 y fue sentido en Costa Rica y el oeste de Panama? con intensidades Mercalli Modificada ma?ximas de VI. En esta regio?n, la placa del Coco, junto con la cordillera ocea?nica del Coco, se subducen bajo la microplaca de Panama?. Usando los registros de la Red Sismolo?gica Nacional de Costa Rica, en este arti?culo se presenta la relocalizacio?n de esa sismicidad con la te?cnica de diferencia doble y se analiza la distribucio?n temporal y geogra?fica de la sismicidad, junto con el mecanismo focal e intensidades de los sismos de mayor taman?o. Los resultados muestran que la secuencia ocurrio? en la zona sismoge?nica interplacas, dentro del a?rea de ruptura del terremoto de Golfito de 1983 (Mw 7.4), entre 12 y 27 km de profundidad, en un agrupamiento buzante 35o al noreste bajo el golfo Dulce. Con base principalmente en estos resultados y en secuencias si?smicas previas, se propone que en el Sureste de Costa Rica la zona sismoge?nica tiene dimensiones de ~160 x 45 km. Adema?s, durante la secuencia de Golfito, ocurrio? la ruptura de una falla inversa (Mw 5.9) dentro de la placa del Coco bajo el golfo Dulce, asi? como la ruptura en fallas de rumbo dextrales en la microplaca de Panama? (Mw 4.6-5.6), a 50 km del golfo Dulce. El estudio de la sismicidad interplacas interciclo contribuye con el conocimiento de la dina?mica de la zona sismoge?nica interplacas. Esto es de particular importancia para el Sureste de Costa Rica, donde se han generado al menos seis terremotos destructivos con Mw > 7 desde 1803, lo que implica el peligro inminente de un pro?ximo terremoto en esta zona.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"7 1","pages":"51-75"},"PeriodicalIF":0.4,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84357075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.22201/IGEOF.00167169P.2020.59.4.1894
J. Lermo-Samaniego
We propose a ground motion attenuation model (ground motion prediction equation, GMPE) for Southeast Mexico. We suppress site effects obtained from Earthquake Horizontal to Vertical Spectral Ratio (EHVSR) as a reliable estimate of site effects. (The attenuation model was built as a function of magnitude and hypocentral distance)). We used 86 seismic events with 5.0 ? Mw ? 8.2 (earthquake recordings for the 9/7/2017, Mw8.2 Tehuantepec earthquake are included), and distances between 52 ? R ? 618 km. They were recorded in nine stations of the Engineering Institute of the National Autonomous University of Mexico (II-UNAM) accelerometric network installed in the states of Chiapas, Oaxaca, Tabasco and Veracruz. Site effects at each of these stations were estimated by using the average EHVSR. Then, by means of this spectral ratio the site effects were suppressed at each station and for every record. This work points out the need to remove the site effect in the GMPE. The current models overestimate this effect.
{"title":"Ground motion prediction model for southeastern México removing site effects using the Earthquake horizontal-to-vertical ratio (EHVSR)","authors":"J. Lermo-Samaniego","doi":"10.22201/IGEOF.00167169P.2020.59.4.1894","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2020.59.4.1894","url":null,"abstract":"We propose a ground motion attenuation model (ground motion prediction equation, GMPE) for Southeast Mexico. We suppress site effects obtained from Earthquake Horizontal to Vertical Spectral Ratio (EHVSR) as a reliable estimate of site effects. (The attenuation model was built as a function of magnitude and hypocentral distance)). We used 86 seismic events with 5.0 ? Mw ? 8.2 (earthquake recordings for the 9/7/2017, Mw8.2 Tehuantepec earthquake are included), and distances between 52 ? R ? 618 km. They were recorded in nine stations of the Engineering Institute of the National Autonomous University of Mexico (II-UNAM) accelerometric network installed in the states of Chiapas, Oaxaca, Tabasco and Veracruz. Site effects at each of these stations were estimated by using the average EHVSR. Then, by means of this spectral ratio the site effects were suppressed at each station and for every record. This work points out the need to remove the site effect in the GMPE. The current models overestimate this effect.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"37 1","pages":"257-272"},"PeriodicalIF":0.4,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75842671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.22201/IGEOF.00167169P.2020.59.4.2019
L. Ávila-Barrientos, F. Pichardo
The Gutenberg-Richter b value is one of the most important tools for seismic hazard studies; this value is most useful in estimating seismicity rates, and also is related to ambient stress levels and shows changes precursory to the occurrence of large earthquakes. However, correct and reliable determinations of the b value are critically dependent on having adequate data samples. Studies oriented to corroborate whether precursory changes in the b value occur before large (M ? 7.0) along the Mexican subduction zone, were done based on data from the Servicio Sismologico Nacional (SSN, Mexico’s National Seismological Service) seismic catalog, from 1988 to 2018. Results for five earthquakes are suggestive that precursory changes may occur, but differences between measured values are not significant because of large uncertainties due to the SSN using different magnitude scales for small (below M ~4.5) and medium to large (above M ~4.5) magnitudes. We submit that until an appropriate scale is implemented for small magnitudes, results from b-value studies based on SSN data should be considered critically.
{"title":"Gutenberg-Richter b value studies along the Mexican Subduction Zone and data constraints","authors":"L. Ávila-Barrientos, F. Pichardo","doi":"10.22201/IGEOF.00167169P.2020.59.4.2019","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2020.59.4.2019","url":null,"abstract":"The Gutenberg-Richter b value is one of the most important tools for seismic hazard studies; this value is most useful in estimating seismicity rates, and also is related to ambient stress levels and shows changes precursory to the occurrence of large earthquakes. However, correct and reliable determinations of the b value are critically dependent on having adequate data samples. Studies oriented to corroborate whether precursory changes in the b value occur before large (M ? 7.0) along the Mexican subduction zone, were done based on data from the Servicio Sismologico Nacional (SSN, Mexico’s National Seismological Service) seismic catalog, from 1988 to 2018. Results for five earthquakes are suggestive that precursory changes may occur, but differences between measured values are not significant because of large uncertainties due to the SSN using different magnitude scales for small (below M ~4.5) and medium to large (above M ~4.5) magnitudes. We submit that until an appropriate scale is implemented for small magnitudes, results from b-value studies based on SSN data should be considered critically.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"6 1","pages":"285-298"},"PeriodicalIF":0.4,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82757607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.22201/IGEOF.00167169P.2020.59.4.2038
M. Abdul-Wahed, M. Alissa
Northwestern Syria is a key area in the eastern Mediterranean to study the active tectonics and stress pattern across the Arabia-Eurasia convergent plate boundary. This study aims to outline the present-day stress regime in this region of Syria using the fault plane solutions of the largest events recorded by the Syrian National Seismological Network from 1995 to 2011. A dataset of fault-plane solutions was obtained for 48 events having at least 5 P-wave polarities. The tectonic regime for most of these events is extensional and produces normal mechanisms in agreement with the local configurations of the seismogenic faults in the region. Strike-slip mechanisms are more scarce and restricted to certain areas, such as the northern extension of the Dead Sea fault system. The results of the current study reveal the spatial variations of SHmax orientation across the northwestern Syria region. This spatial variation of the present-day stress field highlights the role of main geometrically complex shear zones in the present-day stress pattern of northwestern Syria. However, these results show, regardless of the relatively small magnitudes of the studied events, they provide a picture of the local stress deviations that have currently been taking place along the local active faults.
{"title":"Present-day stress state in northwestern Syria","authors":"M. Abdul-Wahed, M. Alissa","doi":"10.22201/IGEOF.00167169P.2020.59.4.2038","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2020.59.4.2038","url":null,"abstract":"Northwestern Syria is a key area in the eastern Mediterranean to study the active tectonics and stress pattern across the Arabia-Eurasia convergent plate boundary. This study aims to outline the present-day stress regime in this region of Syria using the fault plane solutions of the largest events recorded by the Syrian National Seismological Network from 1995 to 2011. A dataset of fault-plane solutions was obtained for 48 events having at least 5 P-wave polarities. The tectonic regime for most of these events is extensional and produces normal mechanisms in agreement with the local configurations of the seismogenic faults in the region. Strike-slip mechanisms are more scarce and restricted to certain areas, such as the northern extension of the Dead Sea fault system. The results of the current study reveal the spatial variations of SHmax orientation across the northwestern Syria region. This spatial variation of the present-day stress field highlights the role of main geometrically complex shear zones in the present-day stress pattern of northwestern Syria. However, these results show, regardless of the relatively small magnitudes of the studied events, they provide a picture of the local stress deviations that have currently been taking place along the local active faults.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"88 1","pages":"299-316"},"PeriodicalIF":0.4,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77464393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.22201/IGEOF.00167169P.2020.59.4.2018
J. Lira
The Spaniards built the Royal Road of the Interior Land in the colonial times of Mexico. Such a road ranged between Mexico City and Santa Fe, New Mexico, USA. Some remnants still survive in Mexico, but their geographic location, position, length and condition are not well known. By means of fieldwork and a search of historic records left by the Spaniards, three segments of the Royal Road were identified. Three high-resolution multispectral images from the Pleiades satellite were acquired. Such images cover three zones where the Royal Road segments were located, and fieldwork was carried out. Due to degradation, the segments of the Royal Road show a low contrast with respect to the surroundings but a distinctive texture. A procedure of enhancement and sharpening was applied to the images based on the Vector Laplacian operator and Principal Component Analysis (PCA). Such a procedure enhances the texture and the edges of the Royal Road segments. An RGB false color composite formed by the Laplacian operator, the first principal component, and band 4, produced an image where the Royal Road segments are clearly observed. By means of fieldwork, the geographic coordinates and condition of the Royal Road segments were identified.
{"title":"The recognition of the remnants of the Royal Road of the interior land using highresolution multispectral satellite images","authors":"J. Lira","doi":"10.22201/IGEOF.00167169P.2020.59.4.2018","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2020.59.4.2018","url":null,"abstract":"The Spaniards built the Royal Road of the Interior Land in the colonial times of Mexico. Such a road ranged between Mexico City and Santa Fe, New Mexico, USA. Some remnants still survive in Mexico, but their geographic location, position, length and condition are not well known. By means of fieldwork and a search of historic records left by the Spaniards, three segments of the Royal Road were identified. Three high-resolution multispectral images from the Pleiades satellite were acquired. Such images cover three zones where the Royal Road segments were located, and fieldwork was carried out. Due to degradation, the segments of the Royal Road show a low contrast with respect to the surroundings but a distinctive texture. A procedure of enhancement and sharpening was applied to the images based on the Vector Laplacian operator and Principal Component Analysis (PCA). Such a procedure enhances the texture and the edges of the Royal Road segments. An RGB false color composite formed by the Laplacian operator, the first principal component, and band 4, produced an image where the Royal Road segments are clearly observed. By means of fieldwork, the geographic coordinates and condition of the Royal Road segments were identified.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"14 1","pages":"273-284"},"PeriodicalIF":0.4,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83531142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.22201/IGEOF.00167169P.2020.59.4.1892
P. Quinde, E. Reinoso
The September 19, 2017 intraslab earthquake (Mw7.1), whose epicenter was located near the limits between the states of Puebla and Morelos at approximately 120km from Mexico City, caused severe damage in these regions. In Mexico City more than 40 buildings collapsed, and hundreds had moderate to severe damage; dozens of them are to be demolished. This article analyzes the spectral ratios of accelerometric stations in the lake-bed of Mexico City with respect to the average Fourier spectra at hill zone sites in order to study and compare over time the changes in the behavior of local effects and their relationship with the damage presented during this earthquake; these ratios exhibit also the settlement problem in some places in the city due to over exploiting the aquifer for water supply purposes. Finally, pseudoacceleration and hysteretic energy maps for Mexico City with a discussion with a possible correlation with reported damages are presented.
{"title":"Subsoil Characteristics of Mexico City, acceleration and hysteretic energy spectra for the Mexico Earthquake of September 19, 2017","authors":"P. Quinde, E. Reinoso","doi":"10.22201/IGEOF.00167169P.2020.59.4.1892","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2020.59.4.1892","url":null,"abstract":"The September 19, 2017 intraslab earthquake (Mw7.1), whose epicenter was located near the limits between the states of Puebla and Morelos at approximately 120km from Mexico City, caused severe damage in these regions. In Mexico City more than 40 buildings collapsed, and hundreds had moderate to severe damage; dozens of them are to be demolished. This article analyzes the spectral ratios of accelerometric stations in the lake-bed of Mexico City with respect to the average Fourier spectra at hill zone sites in order to study and compare over time the changes in the behavior of local effects and their relationship with the damage presented during this earthquake; these ratios exhibit also the settlement problem in some places in the city due to over exploiting the aquifer for water supply purposes. Finally, pseudoacceleration and hysteretic energy maps for Mexico City with a discussion with a possible correlation with reported damages are presented.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"6 1","pages":"234-256"},"PeriodicalIF":0.4,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76940062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-07-01DOI: 10.22201/IGEOF.00167169P.2020.59.3.2091
Alfredo Esparza, J. Arzate, L. Timmen, J. Silliker, M. Schilling
espanolEn este trabajo se reportan los resultados de 16 mediciones de gravedad absoluta (GA) utilizando dos gravimetros de caida libre, el FG5X-220 de la Universidad Leibniz de Hannover (LUH) y el FG5X-252 del Centro Nacional de Metrologia (CENAM). Previo al establecimiento de nuevas estaciones gravimetricas de primer orden y a las campanas de adquisicion en el Bloque de Jalisco (BJ), se llevo a cabo la certificacion del gravimetro FG5X-252 a partir de dos comparaciones instrumentales; la primera con el FG5X-220 de LUH, el cual es un instrumento certificado de larga estabilidad y repetibilidad debajo de los 2 µGal, y la segunda a traves de una comparacion internacional con otros 13 instrumentos en las instalaciones de la NOAA en Table Mountain, Colorado, USA. Las campanas de medicion en el BJ se realizaron durante la estacion seca (Feb/Mar) los anos 2016 y 2018, e incluyo las estaciones de Chamela (CHA), Guadalajara (UGG), Manzanillo (MAN), Puerto Vallarta (UGP) y Tepic (TEP), esta ultima establecida como nueva referencia en el norte del bloque. Los resultados obtenidos de estas dos campanas en el BJ fueron comparados con los valores medidos en 1996 por la NOAA en esta misma region del oeste de Mexico. Los desplazamientos verticales observados en el lapso de dos anos en las estaciones CHA (+22.7 cm), UGG (+44.3 cm) y MAN (+54.6 cm) supera sustancialmente el promedio anual (2.8 cm, 4.2 cm y 3.6 cm respectivamente) con respecto a las mediciones de GA de 1996. En el mismo periodo, la estacion UGP subsidio 8.5 cm mientras que TEP permanecio muy estable (-0.25 cm). En septiembre de 2017 ocurrieron dos grandes sismos de magnitudes 8.2 y 7.1, con epicentros en la costa de Chiapas (07/sep/2017) y en el Estado de Puebla (19/sep/2017), que fueron registrados en algunas de las estaciones GPS de la red UNAVCO en los sitios MAN, UGG y CHA a pesar de que la fuente sismica mas cercana se localiza a mas de 500 km de distancia. El analisis de los datos adquiridos y otros datos geofisicos disponibles apoyan la hipotesis de que el sismo con epicentro en Puebla disparo la subduccion asismica de una porcion de la placa de Rivera (PR), lo que a su vez produjo el levantamiento en dichas estaciones. Concluimos que la subduccion asismica en la zona ocurre debido a la subduccion de una corteza oceanica hidratada que arrastra un importante espesor de sedimentos marinos, lo que genera una interfaz lubricada. EnglishWe report the results of 16 Absolute Gravity (AG) measurements distributed central and western Mexico employing two free-fall gravity instruments; the FG5X-220 of Leibniz Universitat Hannover (LUH), and the FG5X-252 instrument of the Centro Nacional de Metrologia (CENAM). Previous to the setup of new stations and acquisition campaigns, the FG5X-252 was certified in two steps, first a mutual comparison with the reference gravimeter FG5X-220, which have a long range stability below 2 µGal, and later through an international comparison at NOAA´s Table Mountain, Col.
在这项工作中，使用汉诺威莱布尼茨大学(LUH)的FG5X-220和国家计量中心(CENAM)的FG5X-252两种自由落体重力仪进行了16次绝对重力(GA)测量的结果。在哈利斯科区块(BJ)建立新的一级重力站和收购钟之前，通过两个仪器比较对FG5X-252重力仪进行了认证;第一个是LUH的FG5X-220，这是一种经过认证的在2µGal以下具有长期稳定性和重复性的仪器，第二个是通过与美国科罗拉多州Table Mountain NOAA设施的其他13个仪器的国际比较。BJ的测量钟是在2016年和2018年的旱季(2月/ 3月)进行的，包括Chamela (CHA)、Guadalajara (UGG)、Manzanillo (MAN)、Puerto Vallarta (UGP)和Tepic (TEP)站，后者作为区块北部的新参考建立。这两个钟的结果与美国国家海洋和大气管理局1996年在墨西哥西部同一地区测量的值进行了比较。纵向流动观测区间古稀两个季节CHA(+ 22.7厘米),UGG(+ 44.3厘米)和马恩+ 54.6厘米)大幅超过年均(2.8厘米,分别为4.2 cm 3.6厘米)1996年关于测量GA。在同一时期，pmu站补贴8.5厘米，而TEP保持非常稳定(-0.25厘米)。在2017年9月发生两件大地震电火花8.2和7.1勾当中,恰帕斯州海岸(07 /公共教育部2017年)和普埃布拉州(公共教育部/ 2017)19日,在某些季节GPS UNAVCO网络网站MAN UGG, CHA尽管源sismica更靠近位于超过500公里的距离。对获得的数据和其他可用的地球物理数据的分析支持了以普埃布拉为震中的地震触发里维拉板块(PR)部分的地震俯冲的假设，这反过来又导致了这些站的隆起。我们的结论是，该地区的地震俯冲是由于水化的海洋地壳俯冲，它携带了大量的海洋沉积物，产生了润滑的界面。我们报告了使用两种自由落体重力仪对分布在墨西哥中部和西部的16次绝对重力测量的结果;汉诺威莱布尼茨大学的FG5X-220和国家计量中心的FG5X-252仪器。Previous to the setup of new and手册campaigns,成都was the FG5X-252执业in two steps, first相互比较with the参考gravimeter FG5X-220以下,which have long range稳定2µGal和through an international比较在NOAA´s Table Mountain Col.场所与不同国家13其他文书。哈利斯科区块(JB)的收购活动发生在2016年和2018年的旱季，其中包括Chamela (CHA)、Guadalajara (AGG)、Manzanillo (MAN)、Puerto Vallarta (UGP)和Tepic (TEP)的AG站;= =地理= =根据美国人口普查局的数据，该镇总面积为，其中土地和(1.)水。2016年和2018年JB实地活动的结果与NOAA在同一地点获得的1996年AG数据进行了比较。在CHA站(+22.7 cm)、UGG站(+44.3 cm)和MAN站(+54.6 cm)两年内观测到的垂直位移大大超过了2016-1996年AG测量差异的年平均值(2.8 cm、4.2 cm和3.6 cm)。在同一时期，pmu站下降8.5厘米，而TEP站保持相当稳定(-0.25)。2017年9月two large earthquakes电火花8.2和7.1委员In the coast of恰帕斯(07 / Nov . / 2017) and In the State of普埃布拉(/ 2011 / 2017年01月19日),which recorded at some of the UNAVCO´s GPS、成都browde马恩岛、UGG和CHA虽然the nearest seismic source was located more than 500公里to the east。与其他地球物理数据相结合的对我们结果的分析支持了以下假设:普埃布拉震中的地震引发了Ribera Plate (RP)一段的地震俯冲，而这段地震俯冲反过来又使上述站上升。我们得出的结论是，该区域的地震俯冲是由携带大量海洋沉积物的湿海洋地壳推动的，在海洋RP和覆盖JP之间产生了润滑界面。
{"title":"High precision measurements of Absolute Gravity in México: the Jalisco Block changes in gravity triggered by distant earthquakes","authors":"Alfredo Esparza, J. Arzate, L. Timmen, J. Silliker, M. Schilling","doi":"10.22201/IGEOF.00167169P.2020.59.3.2091","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2020.59.3.2091","url":null,"abstract":"espanolEn este trabajo se reportan los resultados de 16 mediciones de gravedad absoluta (GA) utilizando dos gravimetros de caida libre, el FG5X-220 de la Universidad Leibniz de Hannover (LUH) y el FG5X-252 del Centro Nacional de Metrologia (CENAM). Previo al establecimiento de nuevas estaciones gravimetricas de primer orden y a las campanas de adquisicion en el Bloque de Jalisco (BJ), se llevo a cabo la certificacion del gravimetro FG5X-252 a partir de dos comparaciones instrumentales; la primera con el FG5X-220 de LUH, el cual es un instrumento certificado de larga estabilidad y repetibilidad debajo de los 2 µGal, y la segunda a traves de una comparacion internacional con otros 13 instrumentos en las instalaciones de la NOAA en Table Mountain, Colorado, USA. Las campanas de medicion en el BJ se realizaron durante la estacion seca (Feb/Mar) los anos 2016 y 2018, e incluyo las estaciones de Chamela (CHA), Guadalajara (UGG), Manzanillo (MAN), Puerto Vallarta (UGP) y Tepic (TEP), esta ultima establecida como nueva referencia en el norte del bloque. Los resultados obtenidos de estas dos campanas en el BJ fueron comparados con los valores medidos en 1996 por la NOAA en esta misma region del oeste de Mexico. Los desplazamientos verticales observados en el lapso de dos anos en las estaciones CHA (+22.7 cm), UGG (+44.3 cm) y MAN (+54.6 cm) supera sustancialmente el promedio anual (2.8 cm, 4.2 cm y 3.6 cm respectivamente) con respecto a las mediciones de GA de 1996. En el mismo periodo, la estacion UGP subsidio 8.5 cm mientras que TEP permanecio muy estable (-0.25 cm). En septiembre de 2017 ocurrieron dos grandes sismos de magnitudes 8.2 y 7.1, con epicentros en la costa de Chiapas (07/sep/2017) y en el Estado de Puebla (19/sep/2017), que fueron registrados en algunas de las estaciones GPS de la red UNAVCO en los sitios MAN, UGG y CHA a pesar de que la fuente sismica mas cercana se localiza a mas de 500 km de distancia. El analisis de los datos adquiridos y otros datos geofisicos disponibles apoyan la hipotesis de que el sismo con epicentro en Puebla disparo la subduccion asismica de una porcion de la placa de Rivera (PR), lo que a su vez produjo el levantamiento en dichas estaciones. Concluimos que la subduccion asismica en la zona ocurre debido a la subduccion de una corteza oceanica hidratada que arrastra un importante espesor de sedimentos marinos, lo que genera una interfaz lubricada. EnglishWe report the results of 16 Absolute Gravity (AG) measurements distributed central and western Mexico employing two free-fall gravity instruments; the FG5X-220 of Leibniz Universitat Hannover (LUH), and the FG5X-252 instrument of the Centro Nacional de Metrologia (CENAM). Previous to the setup of new stations and acquisition campaigns, the FG5X-252 was certified in two steps, first a mutual comparison with the reference gravimeter FG5X-220, which have a long range stability below 2 µGal, and later through an international comparison at NOAA´s Table Mountain, Col.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"16 1","pages":"155-168"},"PeriodicalIF":0.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74370698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-07-01DOI: 10.22201/IGEOF.00167169P.2020.59.3.2092
M. Al-Hilal
espanolEl radon (222Rn) es un gas radiactivo inerte emanado constantemente de los suelos, rocas y aguas subterraneas, lo cual se debe a la desintegracion alfa del radio (226Ra). La radiactividad, la inercia y la naturaleza gaseosa del radon lo convierten en un indicador ambiental significativo para el analisis de algunos problemas hidrogeologicos que implican interacciones entre las aguas superficiales y subterraneas. El objetivo principal del presente estudio es investigar la posible infiltracion de las aguas superficiales del rio Barada, ubicado en la cuenca de Damasco, a un acuifero adyacente, que incluye algunos pozos que son explotados para contribuir a la red de agua potable de la ciudad de Damasco. La tecnica aplicada se basa en el principio de que, a medida que el agua del rio de radon bajo fluye a traves de la matriz del acuifero, absorbe continuamente el radon emanado de los sedimentos arcillosos del acuifero, alcanzandose el equilibrio entre la captacion de radon y la desintegracion radiactiva. La distribucion de la variacion espacial del radon en el agua subterranea se ha monitoreado en cuatro pozos preexistentes perforados en un sistema acuifero fluvial a lo largo del margen de la orilla del rio Barada. Los resultados revelaron un claro crecimiento de la concentracion de radon en tres o cuatro ordenes de magnitud, con lo cual se alcanzo un estado de equilibrio estable despues de aproximadamente cuatro vidas medias. Con base en la ley estandar de radiactividad, se estimo el tiempo de residencia del agua del rio infiltrado. Los datos hidroquimicos ademas de las investigaciones geologicas y las actividades de radon revelaron principalmente evidencias de infiltracion del agua del rio Barada al sistema de acuiferos cercano, el cual puede volverse vulnerable ante el riesgo de contaminacion ambiental. Finalmente, los resultados tambien mostraron que el aumento de radon en el agua subterranea se correlaciona positivamente con la concentracion de EC (R2 = 0.89) y, en menor medida, con los valores de TDS (R2 = 0.67). Esta asociacion evidente probablemente se deba a la presencia de algo de materia organica y minerales arcillosos en los sedimentos de la matriz del acuifero. EnglishRadon (222Rn) is an inert radioactive gas that is constantly emanated from soils, rocks and groundwater due to alpha decay of radium ( 226Ra). The radioactivity, inertness and gaseous nature of radon make it a significant environmental tracer for examining some hydrogeological issues that involve interactions between surface and ground waters. The main objective of the present study is to investigate possible infiltration from the surface water of the Barada River, located in the Damascus basin, to an adjacent aquifer, which includes some wells frequently exploited to support the drinking water network of Damascus city. The technique applied here is based on the principle that as low-radon river water flows through the aquifer matrix, it continuously absorbs radon eman
西班牙氡(222Rn)是一种惰性放射性气体，由于镭(226Ra)的衰变，不断从土壤、岩石和地下水中释放出来。氡的放射性、惰性和气态性质使其成为分析涉及地表水和地下水相互作用的一些水文地质问题的重要环境指标。本研究的主要目的是调查位于大马士革盆地的巴拉达河地表水可能渗入邻近的含水层，其中包括一些正在开发的井，以促进大马士革市的饮用水网络。基于原则的应用技能,随着低radon水河的流经acuifero矩阵成败得失,不断吸收radon acuifero排雷沉积物胶结,alcanzandose radon captacion平衡和desintegracion放射性。在巴拉达河沿岸的河流含水层系统中钻了4口现有井，监测了地下水中氡的空间变化分布。结果显示，氡浓度明显增加了3到4个数量级，在大约4个半衰期后达到稳定的平衡状态。根据标准放射性定律，估计了渗入河水的停留时间。除了地质调查和氡活动外，水化学数据还揭示了巴拉达河的水渗入附近的含水层系统的主要证据，该系统可能容易受到环境污染的风险。最后，结果还表明，地下水中氡的增加与EC浓度呈正相关(R2 = 0.89)，与TDS值呈正相关(R2 = 0.67)。这种明显的关联可能是由于含水层基质沉积物中存在一些有机物和粘土矿物。EnglishRadon (222Rn) is an inert放射性气体that is不断emanated土壤、岩石和由于alpha radium decay (groundwater 226Ra)。氡的放射性、固有性和气态性质使它成为研究涉及地表和地面水域相互作用的某些水文地质问题的重要环境示明器。本研究的主要目的是调查位于大马士革盆地的巴拉达河地表水可能渗入邻近的含水层，其中包括为支持大马士革市的饮用水网络而经常开采的一些井。The合作原则的that as low-radon here is based on The water river flows through The aquifer matrix,它继续absorbs radon emanated from clayey沉积物目前in The aquifer, with平衡between radon吸收和放射性decay being则忿忿不平。= =地理= =根据美国人口普查，该镇总面积为，其中土地和(1.1%)水。结果显示，氡浓度明显下降了3至4个数量级，在大约4个半衰期后达到稳定平衡状态。根据放射性标准法，估计了渗入河水的居住时间。水化学数据加上地质调查和氡活动，揭示了巴拉达河水渗入附近含水层系统的主要证据，该系统可能容易受到环境污染的威胁。最后，结果还表明，地下水中氡活动的增加与EC浓度(R2 = 0.89)呈正相关，与TDS值(R2 = 0.67)呈正相关。= =地理= =根据美国人口普查，这个县的面积为，其中土地面积为，其中土地面积为。
{"title":"Radon as a natural radiotracer to investigate infiltration from surface water to nearby aquifers: a case study from the Barada riverbank, Syria","authors":"M. Al-Hilal","doi":"10.22201/IGEOF.00167169P.2020.59.3.2092","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2020.59.3.2092","url":null,"abstract":"espanolEl radon (222Rn) es un gas radiactivo inerte emanado constantemente de los suelos, rocas y aguas subterraneas, lo cual se debe a la desintegracion alfa del radio (226Ra). La radiactividad, la inercia y la naturaleza gaseosa del radon lo convierten en un indicador ambiental significativo para el analisis de algunos problemas hidrogeologicos que implican interacciones entre las aguas superficiales y subterraneas. El objetivo principal del presente estudio es investigar la posible infiltracion de las aguas superficiales del rio Barada, ubicado en la cuenca de Damasco, a un acuifero adyacente, que incluye algunos pozos que son explotados para contribuir a la red de agua potable de la ciudad de Damasco. La tecnica aplicada se basa en el principio de que, a medida que el agua del rio de radon bajo fluye a traves de la matriz del acuifero, absorbe continuamente el radon emanado de los sedimentos arcillosos del acuifero, alcanzandose el equilibrio entre la captacion de radon y la desintegracion radiactiva. La distribucion de la variacion espacial del radon en el agua subterranea se ha monitoreado en cuatro pozos preexistentes perforados en un sistema acuifero fluvial a lo largo del margen de la orilla del rio Barada. Los resultados revelaron un claro crecimiento de la concentracion de radon en tres o cuatro ordenes de magnitud, con lo cual se alcanzo un estado de equilibrio estable despues de aproximadamente cuatro vidas medias. Con base en la ley estandar de radiactividad, se estimo el tiempo de residencia del agua del rio infiltrado. Los datos hidroquimicos ademas de las investigaciones geologicas y las actividades de radon revelaron principalmente evidencias de infiltracion del agua del rio Barada al sistema de acuiferos cercano, el cual puede volverse vulnerable ante el riesgo de contaminacion ambiental. Finalmente, los resultados tambien mostraron que el aumento de radon en el agua subterranea se correlaciona positivamente con la concentracion de EC (R2 = 0.89) y, en menor medida, con los valores de TDS (R2 = 0.67). Esta asociacion evidente probablemente se deba a la presencia de algo de materia organica y minerales arcillosos en los sedimentos de la matriz del acuifero. EnglishRadon (222Rn) is an inert radioactive gas that is constantly emanated from soils, rocks and groundwater due to alpha decay of radium ( 226Ra). The radioactivity, inertness and gaseous nature of radon make it a significant environmental tracer for examining some hydrogeological issues that involve interactions between surface and ground waters. The main objective of the present study is to investigate possible infiltration from the surface water of the Barada River, located in the Damascus basin, to an adjacent aquifer, which includes some wells frequently exploited to support the drinking water network of Damascus city. The technique applied here is based on the principle that as low-radon river water flows through the aquifer matrix, it continuously absorbs radon eman","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"34 1","pages":"208-223"},"PeriodicalIF":0.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85303558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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