Pub Date : 2021-06-24DOI: 10.22201/IGEOF.00167169P.2021.60.3.2130
C. Miquel, S. I. Franco, L. Rodríguez, Abdorahman Rajabi, Fernando Núñez Useche
La zona geotérmica de Pathé, en el sector oriental de la Faja Volcánica Transmexicana, ha atraído la atención de exploradores y científicos desde finales del siglo XVIII. El ingeniero de minas alemán Joseph Burkart (1798-1870), discípulo de Alexander von Humboldt (1769-1859), elaboró en 1836 una detallada descripción geológica de la zona, gracias a la cual esta zona geotérmica fue la primera en México en investigarse bajo los paradigmas de la ciencia moderna. A inicios del siglo XX la zona fue estudiada por el ingeniero José Guadalupe Aguilera Serrano (1857-1941), quien en 1907 describió las rocas eruptivas y sus productos de alteración. Su interés eran los yacimientos de caolín de Yexthó, situados a un km de las manifestaciones de termales. A mediados de siglo la zona ya se prospectaba como fuente de energía geotérmica, lo que culminó en la primera planta geotermoeléctrica del continente americano, en operación entre 1959 y 1972 con una capacidad nominal de 3.5 MW. Las manifestaciones termales de Pathé se ubican en la intersección de dos sistemas regionales de fallas, de dirección N-S y E-W, y están encajonadas en una unidad volcánica (toba y lava) de composición básica a intermedia y edad Mioceno superior. Las alteraciones hidrotermales superficiales son conspicuas y su distribución está igualmente controlada por fallas pertenecientes a ambos sistemas. Asociada a las fallas N-S ocurre la asociación de alteración calcita-yeso, que involucra fluidos oxidados y alcalinos. Por otro lado, ligados a las fallas E-W ?más tardías? se hallan los depósitos de caolín, producto de una alteración argílica avanzada, característica de zonas de condensación de vapor. Las condiciones del fluido indicadas por esta alteración son un pH muy ácido (2–3) y temperaturas cercanas a los 100 °C. Por su clara asociación con las fallas, así como por la ausencia de vulcanismo reciente (Cuaternario) cercano, Pathé se clasifica como un sistema geotérmico convectivo controlado por fallas. La sucesión de eventos de alteración sugiere que la actividad hidrotermal inició desde antes del Plioceno.
{"title":"Apunte geológico de la zona geotérmica de Pathé, Hidalgo ? nuevos datos y revisión histórica a partir de fuentes documentales","authors":"C. Miquel, S. I. Franco, L. Rodríguez, Abdorahman Rajabi, Fernando Núñez Useche","doi":"10.22201/IGEOF.00167169P.2021.60.3.2130","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.3.2130","url":null,"abstract":"La zona geotérmica de Pathé, en el sector oriental de la Faja Volcánica Transmexicana, ha atraído la atención de exploradores y científicos desde finales del siglo XVIII. El ingeniero de minas alemán Joseph Burkart (1798-1870), discípulo de Alexander von Humboldt (1769-1859), elaboró en 1836 una detallada descripción geológica de la zona, gracias a la cual esta zona geotérmica fue la primera en México en investigarse bajo los paradigmas de la ciencia moderna. A inicios del siglo XX la zona fue estudiada por el ingeniero José Guadalupe Aguilera Serrano (1857-1941), quien en 1907 describió las rocas eruptivas y sus productos de alteración. Su interés eran los yacimientos de caolín de Yexthó, situados a un km de las manifestaciones de termales. A mediados de siglo la zona ya se prospectaba como fuente de energía geotérmica, lo que culminó en la primera planta geotermoeléctrica del continente americano, en operación entre 1959 y 1972 con una capacidad nominal de 3.5 MW. \u0000Las manifestaciones termales de Pathé se ubican en la intersección de dos sistemas regionales de fallas, de dirección N-S y E-W, y están encajonadas en una unidad volcánica (toba y lava) de composición básica a intermedia y edad Mioceno superior. Las alteraciones hidrotermales superficiales son conspicuas y su distribución está igualmente controlada por fallas pertenecientes a ambos sistemas. Asociada a las fallas N-S ocurre la asociación de alteración calcita-yeso, que involucra fluidos oxidados y alcalinos. Por otro lado, ligados a las fallas E-W ?más tardías? se hallan los depósitos de caolín, producto de una alteración argílica avanzada, característica de zonas de condensación de vapor. Las condiciones del fluido indicadas por esta alteración son un pH muy ácido (2–3) y temperaturas cercanas a los 100 °C. Por su clara asociación con las fallas, así como por la ausencia de vulcanismo reciente (Cuaternario) cercano, Pathé se clasifica como un sistema geotérmico convectivo controlado por fallas. La sucesión de eventos de alteración sugiere que la actividad hidrotermal inició desde antes del Plioceno.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42261252","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 : 2021-06-24DOI: 10.22201/IGEOF.00167169P.2021.60.3.1920
J. Asfahani
Fractal modeling technique, with adapting the concentration-number (C-N) model and the threshold break points concept is newly proposed to interpret vertical electrical sounding (VES) measurements distributed along a given profile. New semi quantitative approach is consequently proposed to rapidly differentiate between different apparent resistivity populations, where 2D semi quantitative interpretation and a primary geological analysis could be constructed. The new technique is practiced and tested on a case study taken from Khanasser Valley, Northern Syria, where different selected profiles (LP1, LP2, LP3, and TP5) are interpreted. The availability and the feasibility of the proposed approached are confirmed and approved through the different comparisons between the multi fractal established cross sections and the traditional 1D VES interpretation models. It is recommended to routinely use this new proposed fractal approach in the geoelectrical researches for interpreting VES measurements distributed along a given profile.
{"title":"New Semi Quantitative Approach for Interpreting Vertical Electrical Sounding (VES) Measurements by Using Fractal Modeling Technique, Case Study from Khanasser Valley, Northern Syria","authors":"J. Asfahani","doi":"10.22201/IGEOF.00167169P.2021.60.3.1920","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.3.1920","url":null,"abstract":"Fractal modeling technique, with adapting the concentration-number (C-N) model and the threshold break points concept is newly proposed to interpret vertical electrical sounding (VES) measurements distributed along a given profile. New semi quantitative approach is consequently proposed to rapidly differentiate between different apparent resistivity populations, where 2D semi quantitative interpretation and a primary geological analysis could be constructed. The new technique is practiced and tested on a case study taken from Khanasser Valley, Northern Syria, where different selected profiles (LP1, LP2, LP3, and TP5) are interpreted. The availability and the feasibility of the proposed approached are confirmed and approved through the different comparisons between the multi fractal established cross sections and the traditional 1D VES interpretation models. It is recommended to routinely use this new proposed fractal approach in the geoelectrical researches for interpreting VES measurements distributed along a given profile.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44365154","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}
ResumenLas soluciones de la Ecuación de Advección-Dispersión son usadas frecuentemente para describir el transporte de solutos a través de medios porosos, considerando adsorción en equilibrio, de tipo lineal y reversible. Para indicar algunas sugerencias acerca de este tema, se hizo una revisión de las soluciones analíticas disponibles. Hay soluciones para Problemas con Condiciones de Frontera, de primer y tercer-tipo en la entrada así como de primer y segundo-tipo a la salida. Se analiza el comportamiento de las soluciones equivalentes, para sistemas finitos y semi-infinitos, observando que las soluciones de los sistemas semi-infinitos se aproximan a las correspondientes de los sistemas finitos conforme la condición de frontera de salida en el infinito se aproxima a la ubicación de medición del sistema finito. Solamente se presentan las soluciones analíticas con condiciones de frontera de segundo-tipo a la salida, ya que son iguales a las correspondientes soluciones analíticas con frontera de primer-tipo a la salida, para ambos tipos de condiciones de frontera de entrada usadas. Un análisis paramétrico, basado en el número de Peclet, muestra que todas las soluciones convergen cuando el número de Peclet es mayor que veinte. Los sistemas investigados deben tener un número de Peclet mayor que cinco para usar con confianza las soluciones de la Ecuación de Advección-Dispersión para describir el transporte de soluto en medios porosos.Palabras Clave: Ecuación de Advección-Difusión, Soluciones Analíticas, Transporte de Solutos Reactivos, Medios Porosos.AbstractThe solutions of Advection-Dispersion Equation are frequently used to describe solute transport through porous media when considering lineal and reversible equilibrium adsorption. To notice some warnings about this item, a review of analytical solutions available was done. There are solutions for Boundary Value Problems with first and third-type inlet boundary conditions as well as first and second-type outlet boundary condition. The behavior of equivalent solutions for finite and semi-infinite systems are analyzed, observing that semi-infinite system solutions approximates to the corresponding finite ones as the “infinite” outlet boundary condition approach to the finite measurement location. Because the analytical solutions with a first-type outlet boundary condition are equal to the corresponding analytical solutions with a second-type one, for both inlet boundary condition type used, only the latter is presented. A parametric analysis based on Peclet number shows that all solutions converge for Peclet number greater than twenty. Systems under research must have Peclet number greater than five to use confidently the solutions of Advection-Dispersion Equation to describe reactive solute transport through porous media.Keywords: Advection-Diffusion Equation, Analytical solutions, Reactive Solute Transport, Porous Media.
摘要考虑平衡、线性和可逆吸附，平流-散射方程的解常被用来描述溶质在多孔介质中的输运。为了对这个问题提出一些建议，我们回顾了可用的解析解。有边界条件问题的解，一种和三种类型的输入，一种和二种类型的输出。分析相应的解决方案,解决方案相比,瘦的系统和semi-infinitos,看系统semi-infinitos接近相关系统的输出条件有限根据边界在无限接近于系统的测量位置有限。本文只给出了在输出处具有二阶边界条件的解析解，因为对于所使用的两种输入边界条件，它们与相应的在输出处具有一阶边界条件的解析解相同。基于Peclet数的参数分析表明，当Peclet数大于20时，所有解都收敛。所研究的系统必须具有大于5的Peclet数，才能可靠地使用平流-色散方程的解来描述溶质在多孔介质中的输运。关键词:平流扩散方程，解析解，反应溶质输运，多孔介质。AbstractThe solutions of Advection-Dispersion transport Equation are频繁用来描述solute通过线性porous半个when虽然ngok和可逆平衡adsorption。= =地理= =根据美国人口普查，这个县的面积为。Value Problems with first and There are solutions for划定third-type inlet划定conditions as well as first and second-type outlet的condition。分析了有限和半无限系统等价解的行为，观察到半无限系统解近似于对应的有限子，作为“无限”出口边界条件方法到有限测度位置。由于具有第一种出口边界条件的分析解与具有第二种出口边界条件的相应分析解相等，对于使用的两种入口边界条件类型，只给出后一种。= =地理= =根据美国人口普查，这个县的总面积为，其中土地和(2.641平方公里)水。制度的研究必须向Peclet number greater than five to use confidently the solutions of Advection-Dispersion transport Equation to描述重新solute through porous半个。关键词:平流扩散方程，分析溶液，反应溶质输运，多孔介质。
{"title":"How to use solutions of Advection-Dispersion Equation to describe reactive solute transport through porous media","authors":"Jetzabeth Ramirez Sabag, Dennys Armando López Falcón","doi":"10.22201/IGEOF.00167169P.2021.60.3.2024","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.3.2024","url":null,"abstract":"ResumenLas soluciones de la Ecuación de Advección-Dispersión son usadas frecuentemente para describir el transporte de solutos a través de medios porosos, considerando adsorción en equilibrio, de tipo lineal y reversible. Para indicar algunas sugerencias acerca de este tema, se hizo una revisión de las soluciones analíticas disponibles. Hay soluciones para Problemas con Condiciones de Frontera, de primer y tercer-tipo en la entrada así como de primer y segundo-tipo a la salida. Se analiza el comportamiento de las soluciones equivalentes, para sistemas finitos y semi-infinitos, observando que las soluciones de los sistemas semi-infinitos se aproximan a las correspondientes de los sistemas finitos conforme la condición de frontera de salida en el infinito se aproxima a la ubicación de medición del sistema finito. Solamente se presentan las soluciones analíticas con condiciones de frontera de segundo-tipo a la salida, ya que son iguales a las correspondientes soluciones analíticas con frontera de primer-tipo a la salida, para ambos tipos de condiciones de frontera de entrada usadas. Un análisis paramétrico, basado en el número de Peclet, muestra que todas las soluciones convergen cuando el número de Peclet es mayor que veinte. Los sistemas investigados deben tener un número de Peclet mayor que cinco para usar con confianza las soluciones de la Ecuación de Advección-Dispersión para describir el transporte de soluto en medios porosos.Palabras Clave: Ecuación de Advección-Difusión, Soluciones Analíticas, Transporte de Solutos Reactivos, Medios Porosos.AbstractThe solutions of Advection-Dispersion Equation are frequently used to describe solute transport through porous media when considering lineal and reversible equilibrium adsorption. To notice some warnings about this item, a review of analytical solutions available was done. There are solutions for Boundary Value Problems with first and third-type inlet boundary conditions as well as first and second-type outlet boundary condition. The behavior of equivalent solutions for finite and semi-infinite systems are analyzed, observing that semi-infinite system solutions approximates to the corresponding finite ones as the “infinite” outlet boundary condition approach to the finite measurement location. Because the analytical solutions with a first-type outlet boundary condition are equal to the corresponding analytical solutions with a second-type one, for both inlet boundary condition type used, only the latter is presented. A parametric analysis based on Peclet number shows that all solutions converge for Peclet number greater than twenty. Systems under research must have Peclet number greater than five to use confidently the solutions of Advection-Dispersion Equation to describe reactive solute transport through porous media.Keywords: Advection-Diffusion Equation, Analytical solutions, Reactive Solute Transport, Porous Media.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45461408","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 : 2021-04-01DOI: 10.22201/IGEOF.00167169P.2021.60.2.2086
A. Pereira, Cecilia Cornero, A. Matos, M. C. Pacino, D. Blitzkow
Despite present efforts to better understand glacier changes and their trends, the satellite gravimetry is a powerful tool still not applied in depth to study relatively large areas in the Andes of Argentina and Chile. In this work the mass variations of the Patagonian Icefield are analyzed together with the decrease trends of the ice layer in the region. The purpose of this study is to demonstrate the GRACE satellite mission (Gravity Recovery and Climate Experiment) ability to detect the water storage changes over the glaciers area. Furthermore, the variations of the hydrometric level of some Patagonian lakes were monitored by combining satellite altimetry data and in situ measurements with the observed water mass variations. Data from GRACE was used to estimate gravity trends, and high-resolution CSR GRACE RL05 mascon solutions were used to analyze the water storage change of the icefields in the region under study for the 2002-2017 period. Virtual stations from satellite altimetry obtained from a lake database and also hydrometric height data from in situ stations, located at Patagonian lakes in Argentina and Chile, were also used in order to compare the TWS from GRACE to the water level of the specific lakes. Additionally, correlation coefficients were determined at each station. The results show a significant water storage decrease in the Icefield area, and they also demonstrate that the ice melt in southern Patagonia (of about 6 cm/year) tends to be more pronounced than in the northern region.
{"title":"Detection of total water mass changes in the Patagonian glaciers area by satellite gravimetry","authors":"A. Pereira, Cecilia Cornero, A. Matos, M. C. Pacino, D. Blitzkow","doi":"10.22201/IGEOF.00167169P.2021.60.2.2086","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.2.2086","url":null,"abstract":"Despite present efforts to better understand glacier changes and their trends, the satellite gravimetry is a powerful tool still not applied in depth to study relatively large areas in the Andes of Argentina and Chile. \u0000In this work the mass variations of the Patagonian Icefield are analyzed together with the decrease trends of the ice layer in the region. The purpose of this study is to demonstrate the GRACE satellite mission (Gravity Recovery and Climate Experiment) ability to detect the water storage changes over the glaciers area. Furthermore, the variations of the hydrometric level of some Patagonian lakes were monitored by combining satellite altimetry data and in situ measurements with the observed water mass variations. \u0000Data from GRACE was used to estimate gravity trends, and high-resolution CSR GRACE RL05 mascon solutions were used to analyze the water storage change of the icefields in the region under study for the 2002-2017 period. \u0000Virtual stations from satellite altimetry obtained from a lake database and also hydrometric height data from in situ stations, located at Patagonian lakes in Argentina and Chile, were also used in order to compare the TWS from GRACE to the water level of the specific lakes. Additionally, correlation coefficients were determined at each station. \u0000The results show a significant water storage decrease in the Icefield area, and they also demonstrate that the ice melt in southern Patagonia (of about 6 cm/year) tends to be more pronounced than in the northern region.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45913564","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 : 2021-04-01DOI: 10.22201/IGEOF.00167169P.2021.60.2.2053
Sanjay Kumar, A. Joshi, R. Castro, S. K. Singh, Sandeep Singh
Abstract We apply an iterative inversion scheme, initially developed by Hashida and Shimazaki (1984) and later modified by Joshi et al., (2010), to estimate three - dimensional shear - wave quality factor, Qs(f), of south-central Gulf of California, Mexico. An area of 230 km x 288 km in this region is divided into 108 rectangular blocks of different Qs(f). We use 25 well-located earthquakes recorded at three broadband stations of the regional network RESBAN operated by CICESE (Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California) and three Ocean Bottom Seismographs (OBS) of the Sea of Cortez Ocean Bottom Array (SCOOBA) experiment. This dataset permits us to obtain Qs(f) estimates of different blocks using the modified inversion algorithm. Qs(f) is obtained at various frequencies in 0.16 - 7.94 Hz range. We found that the estimated Qs structure correlates with geological and tectonic models of the region proposed in previous studies. A regional frequency-dependent relation using all 1944 values of shear-wave quality factor is obtained at 18 different frequencies in all blocks can be approximated by a function of the form Qs(f) = 20 f 1.2. This relation is typical in a tectonically active region with high S-wave attenuation and is similar to attenuation relations reported by other authors for the Imperial Valley, California region.
我们采用一种迭代反演方案，最初由Hashida和Shimazaki(1984)开发，后来由Joshi等人(2010)改进，用于估计墨西哥加利福尼亚湾中南部的三维剪切波质量因子Qs(f)。该地区面积为230公里× 288公里，分为108个不同q (f)的矩形块。我们使用了由CICESE (Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California)运营的RESBAN区域网络的三个宽带站和科尔特斯海海底阵列(SCOOBA)实验的三个海底地震仪(OBS)记录的25次定位良好的地震。该数据集允许我们使用改进的反演算法获得不同区块的Qs(f)估计。Qs(f)在0.16 - 7.94 Hz范围内的不同频率下得到。我们发现，估计的Qs构造与前人提出的该地区的地质构造模型相吻合。在所有区块的18个不同频率上，使用所有1944个剪切波质量因子值获得的区域频率依赖关系可以用Qs(f) = 20f 1.2的函数来近似。这种关系在构造活跃区具有典型的高s波衰减，与其他作者报道的加利福尼亚帝国谷地区的衰减关系相似。
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Pub Date : 2021-04-01DOI: 10.22201/IGEOF.00167169P.2021.60.2.2049
M. E. Hartwig, C. Moreira, M. Melo
The Precambrian metamorphic rocks in the southern region of the Espírito Santo State(southeastern Brazil) is intercepted by ductile and brittle/ductile shear zones over which towns like Guaçuí, Marechal Floriano and Domingos Martins were established. In the years of 2014 to 2016 the Espírito Santo State faced the worst drought in the past 80 years. In situations like that, the only source of fresh water available is underground. Therefore, the purpose of this study was to integrate multisource data for groundwater prospecting and management. The study area comprises the central sectors of the Guaçuí and Batatal shear zones. Methodology involved the interpretation of stereo-pairs for the identification of lineaments, electrical resistivity surveys and geological fieldwork. The results were tentatively validated with available groundwater well production data. Six resistivity profiles with a total length of 2,400 m were surveyed and 15 outcrops were described across these structures. Results have shown that the structural framework of the shear zones is predominantly made of NW to NNW and NE to NNE-trending lineaments. The former is related to brittle tectonics and the latter coincides with the ductile Precambrian fabric of the crystalline basement rocks. A near-surface porous aquifer regarded to the regolith and recent unconsolidated sedimentary deposits presenting resistivity values < 1,372 Ohm.m and depths < 30 m have good potential for groundwater storage. However, results arenot conclusive about the hydrogeological significance of tectonic structures for groundwaterprospection in the study area.
{"title":"Multisource data integration for groundwater prospecting in Precambrian shear zones, Espírito Santo State (Southeastern Brazil)","authors":"M. E. Hartwig, C. Moreira, M. Melo","doi":"10.22201/IGEOF.00167169P.2021.60.2.2049","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.2.2049","url":null,"abstract":"The Precambrian metamorphic rocks in the southern region of the Espírito Santo State(southeastern Brazil) is intercepted by ductile and brittle/ductile shear zones over which towns like Guaçuí, Marechal Floriano and Domingos Martins were established. In the years of 2014 to 2016 the Espírito Santo State faced the worst drought in the past 80 years. In situations like that, the only source of fresh water available is underground. Therefore, the purpose of this study was to integrate multisource data for groundwater prospecting and management. The study area comprises the central sectors of the Guaçuí and Batatal shear zones. Methodology involved the interpretation of stereo-pairs for the identification of lineaments, electrical resistivity surveys and geological fieldwork. The results were tentatively validated with available groundwater well production data. Six resistivity profiles with a total length of 2,400 m were surveyed and 15 outcrops were described across these structures. Results have shown that the structural framework of the shear zones is predominantly made of NW to NNW and NE to NNE-trending lineaments. The former is related to brittle tectonics and the latter coincides with the ductile Precambrian fabric of the crystalline basement rocks. A near-surface porous aquifer regarded to the regolith and recent unconsolidated sedimentary deposits presenting resistivity values < 1,372 Ohm.m and depths < 30 m have good potential for groundwater storage. However, results arenot conclusive about the hydrogeological significance of tectonic structures for groundwaterprospection in the study area.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44528682","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 : 2021-04-01DOI: 10.22201/IGEOF.00167169P.2021.60.2.2085
H. Pereira
Airborne and ground magnetic and gravimetric maps provide important information about the spatial distribution of causative sources in the geological substrate. These sources normally have different physical and geometric properties and are located at different depths, making it difficult to identify the geological features that correspond to the sources. Filtering and enhancement techniques can be used to highlight features in potential field anomalies (such as center and edges of sources). Also, these techniques remove associated noise, isolate shallow from deep sources, and estimate depths. We applied enhancement and depth estimation techniques in airborne and ground potential field data to delineate a subsurface structural framework of two copper occurrences (Victor Teixeira and Capão Grande) in the northwestern border of Camaquã Basin with the Sul-Riograndense Shield. Our results confirmed previously recognized structures and revealed an interconnected structural framework, which has an estimated depth of 170 m by Euler solutions. This configuration suggests a possible connection between the two mineralization outcrops, which are separated by a distance of 2,300 m.
航空和地面磁重图提供了地质基底中诱发源空间分布的重要信息。这些源通常具有不同的物理和几何性质，并且位于不同的深度，因此很难识别与源对应的地质特征。滤波和增强技术可以用来突出势场异常的特征(如源的中心和边缘)。此外，这些技术可以去除相关的噪声，从深层源中分离出浅层源，并估算深度。我们在航空和地面势场数据中应用增强和深度估计技术，描绘了位于Camaquã盆地西北边界的两个铜产点(Victor Teixeira和cap o Grande)的地下结构框架。我们的研究结果证实了之前已知的结构，并揭示了一个相互连接的结构框架，根据欧拉解估计深度为170米。这一构造表明两个矿化露头之间可能存在联系，它们相距2300米。
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Pub Date : 2021-04-01DOI: 10.22201/IGEOF.00167169P.2021.60.2.2002
Rubén de Jesús Escudero Durán, Marco Rogelio Bustamante Orozco, Edgar Ángeles Cordero, Iris Neri Flores, Ojilve Ramón Medrano Pérez
La magnetometría mediante el campo magnético terrestre y las propiedades magnéticas de los materiales, entre otras cosas, tiene la capacidad para determinar regiones con potencial acuífero por medio de la identificación de estructuras geológicas que podrían ser asociadas con permeabilidad. El objetivo principal de esta investigación es identificar las áreas de unidades de rocas con posible potencial acuífero en las subcuencas de la porción oeste de la cuenca baja del río Grijalva, mediante la interpretación de las respuestas magnéticas obtenidas aplicando diversos algoritmos de detección de bordes y la elaboración de modelos 3D de la zona estudiada a base de voxels. Para ello, se realizó el procesado de datos aeromagnéticos con el propósito de resaltar e identificar las características geológicas sobresalientes. Los resultados muestran las zonas con mayor potencial acuífero en el área estudiada. Así, se busca contribuir al conocimiento local y propiciar la toma de decisiones en los temas geohidrológicos, ordenamiento territorial y políticas públicas relacionadas.
{"title":"La magnetometría como alternativa en la búsqueda de aguas subterráneas. El caso de la cuenca baja del río Grijalva.","authors":"Rubén de Jesús Escudero Durán, Marco Rogelio Bustamante Orozco, Edgar Ángeles Cordero, Iris Neri Flores, Ojilve Ramón Medrano Pérez","doi":"10.22201/IGEOF.00167169P.2021.60.2.2002","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.2.2002","url":null,"abstract":"La magnetometría mediante el campo magnético terrestre y las propiedades magnéticas de los materiales, entre otras cosas, tiene la capacidad para determinar regiones con potencial acuífero por medio de la identificación de estructuras geológicas que podrían ser asociadas con permeabilidad. El objetivo principal de esta investigación es identificar las áreas de unidades de rocas con posible potencial acuífero en las subcuencas de la porción oeste de la cuenca baja del río Grijalva, mediante la interpretación de las respuestas magnéticas obtenidas aplicando diversos algoritmos de detección de bordes y la elaboración de modelos 3D de la zona estudiada a base de voxels. Para ello, se realizó el procesado de datos aeromagnéticos con el propósito de resaltar e identificar las características geológicas sobresalientes. Los resultados muestran las zonas con mayor potencial acuífero en el área estudiada. Así, se busca contribuir al conocimiento local y propiciar la toma de decisiones en los temas geohidrológicos, ordenamiento territorial y políticas públicas relacionadas.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"4 1","pages":"175-192"},"PeriodicalIF":0.4,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75180818","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.2021.60.1.2025
R. Darawcheh, R. A. Ghazzi, M. Abdul-Wahed
In this research, a data set of horizontal GPS coseismic displacement in the near-field has been assembled around the world in order to investigate a potential relationship between the displacement and the earthquake parameters. Regression analyses have been applied to the data of 120 interplate earthquakes having the magnitude (Mw 4.8-9.2). An empirical relationship for prediction near-field horizontal GPS coseismic displacement as a function of moment magnitude and the distance between hypocenter and near field GPS station has been established using the multi regression analysis. The obtained relationship allows assessing the coseismic displacements associated with some large historical earthquakes occurred along the Dead Sea fault system. Such a fair relationship could be useful for assessing the coseismic displacement at any point around the active faults.
{"title":"Empirical Relationship for Assessing the Near-Field Horizontal Coseismic Displacement Using GPS Seismology Data","authors":"R. Darawcheh, R. A. Ghazzi, M. Abdul-Wahed","doi":"10.22201/IGEOF.00167169P.2021.60.1.2025","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.1.2025","url":null,"abstract":"In this research, a data set of horizontal GPS coseismic displacement in the near-field has been assembled around the world in order to investigate a potential relationship between the displacement and the earthquake parameters. Regression analyses have been applied to the data of 120 interplate earthquakes having the magnitude (Mw 4.8-9.2). An empirical relationship for prediction near-field horizontal GPS coseismic displacement as a function of moment magnitude and the distance between hypocenter and near field GPS station has been established using the multi regression analysis. The obtained relationship allows assessing the coseismic displacements associated with some large historical earthquakes occurred along the Dead Sea fault system. Such a fair relationship could be useful for assessing the coseismic displacement at any point around the active faults.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"37 1","pages":"31-50"},"PeriodicalIF":0.4,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87147922","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.2021.60.1.1916
A. K. Gupta, P. Patra
The present paper deals with the possibilities of propagation of torsional surface waves in a viscoelastic medium under gravity field. During the study it will observe that the increase in gravity parameter will increase the velocity of the wave, the increase in viscoelastic parameter, decrease the velocity of the wave until the product of angular frequency and viscoelastic parameter is less than unity. It also notes that as the velocity increases, the curve becomes asymptotic in nature when the period of oscillation increases. In fact the maximum damping in velocity has been identified at this cut off point which may be considered as the point where a viscoelastic material becomes a viscous medium.The absorption coefficients have also been calculated for different values of the viscoelastic parameter and gravity field.
{"title":"Influence of gravity on torsional surface waves in a dissipative medium","authors":"A. K. Gupta, P. Patra","doi":"10.22201/IGEOF.00167169P.2021.60.1.1916","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.1.1916","url":null,"abstract":"The present paper deals with the possibilities of propagation of torsional surface waves in a viscoelastic medium under gravity field. During the study it will observe that the increase in gravity parameter will increase the velocity of the wave, the increase in viscoelastic parameter, decrease the velocity of the wave until the product of angular frequency and viscoelastic parameter is less than unity. It also notes that as the velocity increases, the curve becomes asymptotic in nature when the period of oscillation increases. In fact the maximum damping in velocity has been identified at this cut off point which may be considered as the point where a viscoelastic material becomes a viscous medium.The absorption coefficients have also been calculated for different values of the viscoelastic parameter and gravity field.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"311 1","pages":"1-13"},"PeriodicalIF":0.4,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91364075","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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