Pub Date : 2023-12-14DOI: 10.35540/1818-6254.2023.26.15
E. Alyeshina, S. Kurtkin, L. Karpenko
The results of seismic monitoring of the Magadan region, Chukotka Autonomous Area and the shelf of adjacent Okhotsk, Chukchi, Bering and East Siberian seas are considered. There were 14 seismic stations working in the region. The catalog includes information about 644 earthquakes with energy classes KR=4.8–13.2. As usual, most of them (77 %) are localized in the Kolyma region (area № 2).The additional catalog contains information about 12 earthquakes in the Chukchi. The total seismic energy released within the region’s borders was ΣЕ=2.671013 J. The classification of Russian North-East earthquakes was performed using energy classes KR of T.G. Rautian’s scale. According to the earthquake energy representativeness map, the regional network of stations records without omissions the earthquakes with Kmin=7on the territory of Magadan region, with Kmin=8 in the Okhotsk sea and with Kmin=10 in the Chukchi. The strongest earthquake of 2018–2019 with KR=13.2 (MPSP=5.1, MS=4.0) occurred on July 5, 2019 in in the Kolyma area. 14 earthquakes with intensity I=2–5 of the Russian Seismic Intensity Scale (SIS-2017) were felt in North East settlements. Epicenters of Magadan region earthquakes were plotted on the tectonic zoning scheme. Most earthquakes are confined to the largest deep faults in the northwestern and sublatitudinal directions. All hypocenters are located within the earth's crust. The seismicity level of the North-East of Russia in 2018–2019 according to the “SOUS’09” scale was assessed as "background average one" for the observation period from 1968 to 2019. Spatially, all earthquakes in the North-East of Russia are traditionally concentrated in large seismogenic belts: Chersky, North-Okhotsk and Trans-Beringian.
{"title":"SEISMICITY of the NORTH-EAST of RUSSIA in 2018–2019","authors":"E. Alyeshina, S. Kurtkin, L. Karpenko","doi":"10.35540/1818-6254.2023.26.15","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.15","url":null,"abstract":"The results of seismic monitoring of the Magadan region, Chukotka Autonomous Area and the shelf of adjacent Okhotsk, Chukchi, Bering and East Siberian seas are considered. There were 14 seismic stations working in the region. The catalog includes information about 644 earthquakes with energy classes KR=4.8–13.2. As usual, most of them (77 %) are localized in the Kolyma region (area № 2).The additional catalog contains information about 12 earthquakes in the Chukchi. The total seismic energy released within the region’s borders was ΣЕ=2.671013 J. The classification of Russian North-East earthquakes was performed using energy classes KR of T.G. Rautian’s scale. According to the earthquake energy representativeness map, the regional network of stations records without omissions the earthquakes with Kmin=7on the territory of Magadan region, with Kmin=8 in the Okhotsk sea and with Kmin=10 in the Chukchi. The strongest earthquake of 2018–2019 with KR=13.2 (MPSP=5.1, MS=4.0) occurred on July 5, 2019 in in the Kolyma area. 14 earthquakes with intensity I=2–5 of the Russian Seismic Intensity Scale (SIS-2017) were felt in North East settlements. Epicenters of Magadan region earthquakes were plotted on the tectonic zoning scheme. Most earthquakes are confined to the largest deep faults in the northwestern and sublatitudinal directions. All hypocenters are located within the earth's crust. The seismicity level of the North-East of Russia in 2018–2019 according to the “SOUS’09” scale was assessed as \"background average one\" for the observation period from 1968 to 2019. Spatially, all earthquakes in the North-East of Russia are traditionally concentrated in large seismogenic belts: Chersky, North-Okhotsk and Trans-Beringian.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"26 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138971453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.35540/1818-6254.2023.26.23
N. Stepanenco, V. Cardanets
All earthquakes felt in 2018–2019 on the territory of Moldova occurred outside its borders, in the Vrancea region (Romania), with intermediate depths in the range hрР=117–151 km. In 2018, the population of Moldova felt three earthquakes: March 14th, April 25th and October 28th. The article describes all of them, but with more details for the strongest of them on October 28th. The earthquake of March 14th with mb=4.5 and hрР=140 km was felt in the eastern and southern counties of Romania in seven localities. In Moldova, the earthquake was felt in Cahul with intensity I=3 and in Chisinau with I=2 by MSK-64. The epicenter was in the Vrancea Mountains. The earthquake of April 25th with mb=4.5 and hрР=151 km was felt in eight localities of the eastern and southern counties of Romania. Also it was felt in two localities in the central and southern regions of the Republic of Moldova. The earthquake of October 28th with mb=5.6 and hрР=151 km was most evident in the eastern and southern parts of Romania, but it was also felt in the north of Bulgaria, in Moldova and in the south-west of Ukraine. In 2019, the population of Moldova felt the earthquake on September 3rd with mb=4.5 and hрР=117 km. It was felt in six localities of the eastern and southern counties of Romania, as well as in the central and southern regions of the Republic of Moldova (in Cahul I=3–4, in Chisinau I=3). The focal mechanisms given in the article indicate that all the considered earthquakes occurred under the influence of the prevailing near-horizontal compression and intermediate extension.
{"title":"EARTHQUAKES of 2018–2019 FELT in MOLDOVA (Romania – Moldova)","authors":"N. Stepanenco, V. Cardanets","doi":"10.35540/1818-6254.2023.26.23","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.23","url":null,"abstract":"All earthquakes felt in 2018–2019 on the territory of Moldova occurred outside its borders, in the Vrancea region (Romania), with intermediate depths in the range hрР=117–151 km. In 2018, the population of Moldova felt three earthquakes: March 14th, April 25th and October 28th. The article describes all of them, but with more details for the strongest of them on October 28th. The earthquake of March 14th with mb=4.5 and hрР=140 km was felt in the eastern and southern counties of Romania in seven localities. In Moldova, the earthquake was felt in Cahul with intensity I=3 and in Chisinau with I=2 by MSK-64. The epicenter was in the Vrancea Mountains. The earthquake of April 25th with mb=4.5 and hрР=151 km was felt in eight localities of the eastern and southern counties of Romania. Also it was felt in two localities in the central and southern regions of the Republic of Moldova. The earthquake of October 28th with mb=5.6 and hрР=151 km was most evident in the eastern and southern parts of Romania, but it was also felt in the north of Bulgaria, in Moldova and in the south-west of Ukraine. In 2019, the population of Moldova felt the earthquake on September 3rd with mb=4.5 and hрР=117 km. It was felt in six localities of the eastern and southern counties of Romania, as well as in the central and southern regions of the Republic of Moldova (in Cahul I=3–4, in Chisinau I=3). The focal mechanisms given in the article indicate that all the considered earthquakes occurred under the influence of the prevailing near-horizontal compression and intermediate extension.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"6 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138971898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.35540/1818-6254.2023.26.22
A. Zvereva, L. Malyanova, I. Gabsatarova
The dynamic parameters of the sources of 44 earthquakes in the North Caucasus were determined from the amplitude spectra of S-waves for the period 2018–2019 with an energy class according to T.G. Rautian scale KR=9.1–14.1. Earthquake records from regional digital seismic stations of the North Caucasus network, with epicentral distances of no more than 300 km were used for the calculation. The source spectra were calculated based on the frequency-dependent quality factor Q(f) for earthquakes in the North Caucasus western zone – Q(f)=90f 1.02 – and eastern zone – Q(f)=97f 0.89 . The SEISAN program was used for the spectral analysis of 31 earthquakes. The following values were obtained: 0 – spectral density, f0 – corner frequency, M0 – scalar seismic moment, Mw – moment magnitude, L – length of the rupture at the source of an earthquake, or r – radius of the circular area, – stress drop. Relationships between lgM0 and KR and Mw and KR are obtained.
{"title":"SPECTRAL and SOURCE PARAMETERS of NORTH CAUCASUS EARTHQUAKES in 2018–2019","authors":"A. Zvereva, L. Malyanova, I. Gabsatarova","doi":"10.35540/1818-6254.2023.26.22","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.22","url":null,"abstract":"The dynamic parameters of the sources of 44 earthquakes in the North Caucasus were determined from the amplitude spectra of S-waves for the period 2018–2019 with an energy class according to T.G. Rautian scale KR=9.1–14.1. Earthquake records from regional digital seismic stations of the North Caucasus network, with epicentral distances of no more than 300 km were used for the calculation. The source spectra were calculated based on the frequency-dependent quality factor Q(f) for earthquakes in the North Caucasus western zone – Q(f)=90f 1.02 – and eastern zone – Q(f)=97f 0.89 . The SEISAN program was used for the spectral analysis of 31 earthquakes. The following values were obtained: 0 – spectral density, f0 – corner frequency, M0 – scalar seismic moment, Mw – moment magnitude, L – length of the rupture at the source of an earthquake, or r – radius of the circular area, – stress drop. Relationships between lgM0 and KR and Mw and KR are obtained.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"16 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138972514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.35540/1818-6254.2023.26.18
Т.I. Aronova, G. Aronov, О.V. Zaharevich, A.G. Aronov
A review of seismicity in the territory of Belarus within 2018–2019 based on the data of 17 digital stations is presented. A total of 72 events with Kd=4.9–8.6 were recorded in 2018 and 69 events with Kd=4.9– 8.2 − in 2019. All of the events were confined to the southern part of the territory, the Soligorsk mining area included. The comparison of NΣ and ΣE annual estimations for 2018 and 2019 with the long-term average values shows that the level of the seismic energy released in 2018 and 2019 remains low, but a number of the events for the periods under consideration are higher than the long-term average background values. There is no the stable correlation between the released seismic energy and the number of events for a long-term period of 1983−2019.
{"title":"SEISMICITY of the TERRITORY of BELARUS in 2018–2019","authors":"Т.I. Aronova, G. Aronov, О.V. Zaharevich, A.G. Aronov","doi":"10.35540/1818-6254.2023.26.18","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.18","url":null,"abstract":"A review of seismicity in the territory of Belarus within 2018–2019 based on the data of 17 digital stations is presented. A total of 72 events with Kd=4.9–8.6 were recorded in 2018 and 69 events with Kd=4.9– 8.2 − in 2019. All of the events were confined to the southern part of the territory, the Soligorsk mining area included. The comparison of NΣ and ΣE annual estimations for 2018 and 2019 with the long-term average values shows that the level of the seismic energy released in 2018 and 2019 remains low, but a number of the events for the periods under consideration are higher than the long-term average background values. There is no the stable correlation between the released seismic energy and the number of events for a long-term period of 1983−2019.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"682 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138973848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.35540/1818-6254.2023.26.06
I. Gabsatarova, L. Koroletski, L. Ivanova, A. Sayapina, S. Bagaeva, Z.M. Adilov, O. Asmanov
Seismic monitoring of the territory of the North Caucasus in 2018–2019 was carried our by a seismic network of 66 stations. All stations were digitally equipped. The seismic network provided representative registration of earthquakes with KR≥7.0 in most of the territory, in its central (including the Greater Sochi region) and eastern parts – with KR≥6.0, and in some local zones – with KP≥5.5. In general, 6874 earthquakes have been recorded in the region and its environs. 59 earthquakes were felt in the Caucasus settlements, 26 of them occurred in the North Caucasus region. The maximum shaking intensity Imax=6 by the MSK-64 scale was noted from the Zagatala earthquake of June 5, 2018 with KR=14.1 occurred in the territory of the Azerbaijan and from Buynak-II earthquake of May 24, 2019 with KR=11.5 in Dagestan near the Chirkey reservoir. On the territory of Ossetia and Ingushetia (Tersko-Caspian forward trough) two earthquakes, Zamankul and Yandar, were felt with intensity up to I=5. A doublet EQ felt up to I=3–4 was recorded on November 24, 2018 (KR=10.3) and November 25, 2018 (KR=10.5) in the West Kuban marginal trough. In accordance with the seismicity level scale "SOUS-09", seismicity of the North Caucasus in 2018–2019 is set as a "background average" for the observation period from 1962 to 2019.
{"title":"SEISMICITY of the NORTHERN CAUCASUS in 2018–2019","authors":"I. Gabsatarova, L. Koroletski, L. Ivanova, A. Sayapina, S. Bagaeva, Z.M. Adilov, O. Asmanov","doi":"10.35540/1818-6254.2023.26.06","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.06","url":null,"abstract":"Seismic monitoring of the territory of the North Caucasus in 2018–2019 was carried our by a seismic network of 66 stations. All stations were digitally equipped. The seismic network provided representative registration of earthquakes with KR≥7.0 in most of the territory, in its central (including the Greater Sochi region) and eastern parts – with KR≥6.0, and in some local zones – with KP≥5.5. In general, 6874 earthquakes have been recorded in the region and its environs. 59 earthquakes were felt in the Caucasus settlements, 26 of them occurred in the North Caucasus region. The maximum shaking intensity Imax=6 by the MSK-64 scale was noted from the Zagatala earthquake of June 5, 2018 with KR=14.1 occurred in the territory of the Azerbaijan and from Buynak-II earthquake of May 24, 2019 with KR=11.5 in Dagestan near the Chirkey reservoir. On the territory of Ossetia and Ingushetia (Tersko-Caspian forward trough) two earthquakes, Zamankul and Yandar, were felt with intensity up to I=5. A doublet EQ felt up to I=3–4 was recorded on November 24, 2018 (KR=10.3) and November 25, 2018 (KR=10.5) in the West Kuban marginal trough. In accordance with the seismicity level scale \"SOUS-09\", seismicity of the North Caucasus in 2018–2019 is set as a \"background average\" for the observation period from 1962 to 2019.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"1992 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138973954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.35540/1818-6254.2023.26.29
F. Verkholantsev, R. Diagilev, D. Shulakov, Yuliya V. Varlashova
The instrumental and macroseismic data on the earthquake of September 4, 2018 at 22h58m19s UTC, ML=5.4, I0=6.4±0.3 near the city of Katav-Ivanovsk in the Chelyabinsk region (South Urals) are presented. This event with ML=5.4 mb=5.5 became the strongest instrumentally recorded earthquake in the Urals and had the highest macroseismic effect among the Russian earthquakes in 2018 (I0=6.4±0.3). For the first time in the practice of processing macroseismic data in the Urals, the Seismic Intensity Scale 2017 (GOST R 57546-2017) was used. For the first time for natural earthquakes in the Urals, an aftershock process was recorded, the active stage of which lasted about 11 months, while many aftershocks had a significant macroseismic effect. Taking into account the spatial orientation of the aftershock cloud, the focal mechanism solution was confirmed and the tectonic position of the source was substantiated.
{"title":"SEPTEMBER 4, 2018 KATAV-IVANOVSK EARTHQUAKE with ML=5.4, mb=5.5, I0=6.4","authors":"F. Verkholantsev, R. Diagilev, D. Shulakov, Yuliya V. Varlashova","doi":"10.35540/1818-6254.2023.26.29","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.29","url":null,"abstract":"The instrumental and macroseismic data on the earthquake of September 4, 2018 at 22h58m19s UTC, ML=5.4, I0=6.4±0.3 near the city of Katav-Ivanovsk in the Chelyabinsk region (South Urals) are presented. This event with ML=5.4 mb=5.5 became the strongest instrumentally recorded earthquake in the Urals and had the highest macroseismic effect among the Russian earthquakes in 2018 (I0=6.4±0.3). For the first time in the practice of processing macroseismic data in the Urals, the Seismic Intensity Scale 2017 (GOST R 57546-2017) was used. For the first time for natural earthquakes in the Urals, an aftershock process was recorded, the active stage of which lasted about 11 months, while many aftershocks had a significant macroseismic effect. Taking into account the spatial orientation of the aftershock cloud, the focal mechanism solution was confirmed and the tectonic position of the source was substantiated.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"46 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138974777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.35540/1818-6254.2023.26.19
F. Verkholantsev, I. Golubeva, R. Dyagilev, T. Zlobina
The article summarizes information about seismic network in the Urals and Western Siberia region, describes processing technique, presents short analysis of seismic activity for 2018–2019. Seismic network capability is shown for whole territory under control. It was found that about 82 % of registered events are explosions in mines and open pits, 74 events are natural and 76 are induced ones. For the strongest induced events, variants of source parameters obtained by different agencies are shown.
{"title":"SEISMICITY of the URALS and WESTERN SIBERIA in 2018–2019","authors":"F. Verkholantsev, I. Golubeva, R. Dyagilev, T. Zlobina","doi":"10.35540/1818-6254.2023.26.19","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.19","url":null,"abstract":"The article summarizes information about seismic network in the Urals and Western Siberia region, describes processing technique, presents short analysis of seismic activity for 2018–2019. Seismic network capability is shown for whole territory under control. It was found that about 82 % of registered events are explosions in mines and open pits, 74 events are natural and 76 are induced ones. For the strongest induced events, variants of source parameters obtained by different agencies are shown.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138975011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.35540/1818-6254.2023.26.14
D. Chebrov, E. Matveenko, E. Romasheva, V. Saltikov, I. Abubakirov, S. Droznina, S. Mityushkina, V. Pavlov, A. A. Raevskaya
The seismicity review of Kamchatka and surrounding territories for 2018–2019 is given. In the Kamchatka earthquake catalogue, the minimum local magnitude of completeness is MLmin=3.8, and for the Kamchatka seismically active region (latitude = 50.5–56.5° N, longitude = 156.5–167° E) MLmin=3.7, and for earthquakes with h≥350 km under the Okhotsk sea MLmin=3.8. The Kamchatka earthquake catalogue for 2018–2019, published in the Appendix to this article, includes 3646 events with ML≥3.5; 228 earthquakes with ML=3.65–7.3 were felt in Kamchatka and surrounding areas with seismic intensity I of 1–2 to 6–7 according to the Seismic Intensity Scale-2017 (Russian state standard). For 134 events with ML≥5.0 that occurred in 2018–2019 within the area of responsibility of Кamchatka branch of Geophysical Survey RAS, an attempt to calculate the seismic moment tensor (SMT) was made. The SMT and depth h of the equivalent point source were calculated for 67 earthquakes in 2018 with a range of ML=5.0–7.3, and for 67 events in 2019 with a range of ML=5.0–6.45. The level of seismicity according to the "SOUS'09" scale in 2018 corresponded to the “background increased”, but within the assessment accuracy – “high”; for 2019 it was the “background average”. On December 20, 2018, there was a strong earthquake with Mw=7.3, named “the Angular Uplift earthquake”. This earthquake was the strongest intraplate event, which belongs to the region south of the junction zone of the Kamchatka and Aleutian trenches The earthquake was accompanied by a large number of aftershocks.
{"title":"SEISMICITY of KAMCHATKA and COMMANDERISLANDS in 2018–2019","authors":"D. Chebrov, E. Matveenko, E. Romasheva, V. Saltikov, I. Abubakirov, S. Droznina, S. Mityushkina, V. Pavlov, A. A. Raevskaya","doi":"10.35540/1818-6254.2023.26.14","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.14","url":null,"abstract":"The seismicity review of Kamchatka and surrounding territories for 2018–2019 is given. In the Kamchatka earthquake catalogue, the minimum local magnitude of completeness is MLmin=3.8, and for the Kamchatka seismically active region (latitude = 50.5–56.5° N, longitude = 156.5–167° E) MLmin=3.7, and for earthquakes with h≥350 km under the Okhotsk sea MLmin=3.8. The Kamchatka earthquake catalogue for 2018–2019, published in the Appendix to this article, includes 3646 events with ML≥3.5; 228 earthquakes with ML=3.65–7.3 were felt in Kamchatka and surrounding areas with seismic intensity I of 1–2 to 6–7 according to the Seismic Intensity Scale-2017 (Russian state standard). For 134 events with ML≥5.0 that occurred in 2018–2019 within the area of responsibility of Кamchatka branch of Geophysical Survey RAS, an attempt to calculate the seismic moment tensor (SMT) was made. The SMT and depth h of the equivalent point source were calculated for 67 earthquakes in 2018 with a range of ML=5.0–7.3, and for 67 events in 2019 with a range of ML=5.0–6.45. The level of seismicity according to the \"SOUS'09\" scale in 2018 corresponded to the “background increased”, but within the assessment accuracy – “high”; for 2019 it was the “background average”. On December 20, 2018, there was a strong earthquake with Mw=7.3, named “the Angular Uplift earthquake”. This earthquake was the strongest intraplate event, which belongs to the region south of the junction zone of the Kamchatka and Aleutian trenches The earthquake was accompanied by a large number of aftershocks.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"4 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138972114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.35540/1818-6254.2023.26.07
G.Ch. Saryeva, L.V. Bezmenova, N. Petrova
In 2018–2019, the monitoring of seismicity in the Kopetdag region was carried out by a network of 34 seismic stations of the Institute of Seismology and Atmospheric Physics of the Academy of Sciences of Turkmenistan, of which 20 are stationary and 14 are mobile. For two years, 348 earthquakes with KR≥8.6 were registered, for 62 events the focal mechanisms were determined. More than 20 earthquakes were felt in the settlements of Turkmenistan, but only a part of them were localized directly within its borders. The earthquake of January 7, 2018 with KR=12.1 (mb=4.8), located in the Balkhan-Caspian area, was felt with maximum intensity on the territory of Turkmenistan and caused shaking in the city of Turkmenbashi with an intensity of Ii=3–4, and in the city of Balkanabat Ii=2–3. Among seismic events outside Turkmenistan, the earthquakes that occurred in Afghanistan on May 9, 2018 (Mw=6.3) and December 20, 2019 (Mw=6.2) stand out with the highest magnitude and macroseismic manifestations in the territory of Turkmenistan. The shaking intensity from the first event in the nearest settlements of Tajikistan and Afghanistan was Ii=5, and in the Turkmen city of Magdanly (483 km) – Ii=2–3. The second event was felt in Dushanbe (Tadjikistan) up to Ii=4, and in Magdanly (Turkmenistan, =418 km) – up to Ii=2. Among the seismically active areas of the Kopetdag region, the maximum amount of seismic energy in 2018 was released on the territory of the Turkmen-Khorasan area, and in 2019 – in Eastern Turkmenistan. For the Kopetdag region as a whole, seismic activity and corresponding parameters of the seismic regime in 2018 and 2019 decreased significantly compared to their long-term averages.
{"title":"SEISMICITY of the KOPETDAG REGION in 2018–2019","authors":"G.Ch. Saryeva, L.V. Bezmenova, N. Petrova","doi":"10.35540/1818-6254.2023.26.07","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.07","url":null,"abstract":"In 2018–2019, the monitoring of seismicity in the Kopetdag region was carried out by a network of 34 seismic stations of the Institute of Seismology and Atmospheric Physics of the Academy of Sciences of Turkmenistan, of which 20 are stationary and 14 are mobile. For two years, 348 earthquakes with KR≥8.6 were registered, for 62 events the focal mechanisms were determined. More than 20 earthquakes were felt in the settlements of Turkmenistan, but only a part of them were localized directly within its borders. The earthquake of January 7, 2018 with KR=12.1 (mb=4.8), located in the Balkhan-Caspian area, was felt with maximum intensity on the territory of Turkmenistan and caused shaking in the city of Turkmenbashi with an intensity of Ii=3–4, and in the city of Balkanabat Ii=2–3. Among seismic events outside Turkmenistan, the earthquakes that occurred in Afghanistan on May 9, 2018 (Mw=6.3) and December 20, 2019 (Mw=6.2) stand out with the highest magnitude and macroseismic manifestations in the territory of Turkmenistan. The shaking intensity from the first event in the nearest settlements of Tajikistan and Afghanistan was Ii=5, and in the Turkmen city of Magdanly (483 km) – Ii=2–3. The second event was felt in Dushanbe (Tadjikistan) up to Ii=4, and in Magdanly (Turkmenistan, =418 km) – up to Ii=2. Among the seismically active areas of the Kopetdag region, the maximum amount of seismic energy in 2018 was released on the territory of the Turkmen-Khorasan area, and in 2019 – in Eastern Turkmenistan. For the Kopetdag region as a whole, seismic activity and corresponding parameters of the seismic regime in 2018 and 2019 decreased significantly compared to their long-term averages.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"33 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138974749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.35540/1818-6254.2023.26.10
N.N. Mikhailova, A.Zh. Zhunusova, I.N. Sokolova
In 2018–2019, the seismic monitoring in Kazakhstan was conducted by the Seismological Experience-Methodical Expedition of the Committee of Science of the Ministry of Education and Science of the Republic of Kazakhstan and the Republican State Enterprise «Institute of Geophysical Research of the Ministry of Energy of the Republic of Kazakhstan». The paper presents detailed information on seismic observation networks. The joint catalogue based on the data of two organizations was compiled. It includes 1050 earthquakes with energy class KR=6.6–12.8. The strongest earthquake within the considered territory occurred on February 1, 2019, KR=12.8, MPVA=5.6, Mw=5.0. Its epicenter was located on the territory of Xinjiang (China), near the Kazakhstan-Chinese border. The earthquake was felt in numerous settlements in Kazakhstan. On so-called “Northern Tien Shan” territory, the strongest earthquake occurred on March 26, 2018, KR=12.0, MPVA=5.5, the epicenter was near Kapchagay water basin on the territory of Iliy depression. For the period 2018–2019, on the territory of Kazakhstan there were induced and natural-induced earthquakes at the west, central, and east Kazakhstan. In whole, the period of 2018–2019 was characterized by moderate seismicity for the major part of the country’s territory.
{"title":"SEISMICITY of KAZAKHSTAN and ADJACENT TERRITORIES in 2018–2019","authors":"N.N. Mikhailova, A.Zh. Zhunusova, I.N. Sokolova","doi":"10.35540/1818-6254.2023.26.10","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.10","url":null,"abstract":"In 2018–2019, the seismic monitoring in Kazakhstan was conducted by the Seismological Experience-Methodical Expedition of the Committee of Science of the Ministry of Education and Science of the Republic of Kazakhstan and the Republican State Enterprise «Institute of Geophysical Research of the Ministry of Energy of the Republic of Kazakhstan». The paper presents detailed information on seismic observation networks. The joint catalogue based on the data of two organizations was compiled. It includes 1050 earthquakes with energy class KR=6.6–12.8. The strongest earthquake within the considered territory occurred on February 1, 2019, KR=12.8, MPVA=5.6, Mw=5.0. Its epicenter was located on the territory of Xinjiang (China), near the Kazakhstan-Chinese border. The earthquake was felt in numerous settlements in Kazakhstan. On so-called “Northern Tien Shan” territory, the strongest earthquake occurred on March 26, 2018, KR=12.0, MPVA=5.5, the epicenter was near Kapchagay water basin on the territory of Iliy depression. For the period 2018–2019, on the territory of Kazakhstan there were induced and natural-induced earthquakes at the west, central, and east Kazakhstan. In whole, the period of 2018–2019 was characterized by moderate seismicity for the major part of the country’s territory.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"7 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138975044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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