Earthquakes in Northern Eurasia最新文献

{"title":"EARTHQUAKE FOCAL PARAMETERS in the CRIMEAN-BLACK SEA REGION in 2018–2019","authors":"B. Pustovitenko, E. Eredzhepov, M. Bondar","doi":"10.35540/1818-6254.2023.26.21","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.21","url":null,"abstract":"The results of calculation and analysis of spectral and dynamic parameters of the sources (М0,r0, , , ησ, r, ū, Eu и Mw) of 24 Crimean earthquakes for 2018–2019 in the range of energy classes KП=5.8–11 are presented. 157 station amplitude spectra of P- and S- seismic waves recorded at seven regional digital seismic stations were used for calculations. The determination of dynamic parameters of the sources was carried out using the Brune theoretical dislocation model. The average values of the dynamic parameters of earthquake sources for 2018–2019 were in most cases estimated for several stations and for different types of waves, which ensured a small value of the degree of scattering of individual estimates. For the studied 2018–2019 earthquakes, the average values of the seismic moment М0, the radius of the circular dislocation r0, and the stress drop  were within the confidence intervals of the long-term dependencies М0(KП), r0 (KП) and (KП). For five strongest earthquakes of 2018 (January 31, April 24, September 9, September 13, and October 15 with KП=10.5–11) and two earthquakes of 2019 (May 8 and December 4), focal mechanism solutions were obtained within the framework of the double dipole model. Type of movement in the source of January 31, 2018 earthquake is a strike-slip with a normal fault component, of September 9 and September 13, 2018 – a normal fault, of April 24 and October 15, 2018, as well as May 8 and December 4, 2019 – a reverse fault. The spectral composition of seismic oscillations was additionally studied from the energy spectra of 15 earthquakes using records at the Alushta station located at distances 5–285 km from source zones. At the qualitative level, a shift of the spectrum maximum (fqmax) towards higher frequencies for weak shocks and close epicentral distances.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138970987","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}

{"title":"SEISMICITY of AZERBAIJAN and ADJACENT TERRITORIES in 2018–2019","authors":"G. Etirmishli, R. Abdullaeva, S.S. Ismailova, S. Kazimova","doi":"10.35540/1818-6254.2023.26.04","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.04","url":null,"abstract":"In 2018–2019, the Azerbaijan network of seismic stations continued to operate without changes and consisted of 35 digital stations. To estimate the magnitude of earthquakes in these years, only the local magnitude ML Azr was determined. The total number of earthquakes recorded by the Azerbaijan network of stations was 5387 in 2018 and 6880 in 2019, however, the catalog of earthquakes in Azerbaijan and adjacent territories, published in the appendix to this article, provides data on earthquakes only with a magnitude of ML Azr3.0, which ОБЗОР СЕЙСМИЧНОСТИ 66 number was 101 in 2018 and 115 in 2019. The number N of the representative level earthquakes (KR≥9) in the study area slightly increased in 2018 and 2019 compared to the long-term average annual value Nav for 1993– 2017, while the released seismic energy decreased relative to the background level by 6 and 7 times, respectively. The most significant seismic event on the territory of the Republic in 2018 was the earthquake of June 5 with ML Azr=5.5, and in 2019 – the earthquake of February 5, ML Azr=5.2. Both events were felt in the nearest settlements with an intensity of Ii=6.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"103 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138971226","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}

{"title":"SEISMICITY of the ARCTIC in 2018–2019","authors":"A. Morozov, G. Antonovskaya, V. Asming, S.V. Baranov, N. Vaganova, Yu.A. Vinogradov, Y. Konechnaya, A.V. Fedorov, S.V. Shibaev","doi":"10.35540/1818-6254.2023.26.20","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.20","url":null,"abstract":"The article provides an overview and analysis of seismicity within the boundaries of the Arctic region for 2018–2019, a description of seismic station networks, and processing methods. The consolidated catalog of earthquakes in the Arctic region was compiled on the basis of catalogs of several organizations and seismological centers. In total, 1177 earthquakes for 2018–2019 are included in the consolidated catalog. Most of the earthquakes that occurred in 2018–2019, including all the strongest earthquakes, were located within the mid-ocean ridges of Mon, Knipovich. and Gakkel. In the offshore territories, most of the earthquakes were confined to the Svalbard archipelago, in particular, to the seismically active zone in the Sturfjord strait. Within the shelf areas, seismicity is also characteristic of the \"continent-ocean\" transition zone of the Barents-Kara region, Bely (Kvitøya) Island and Novaya Zemlya archipelago. For 28 earthquakes, the focal mechanism parameters are presented according to the Global CMT catalog.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"27 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138971666","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}

{"title":"SEISMICITY of the RUSSIAN PART of EAST EUROPEAN PLATFORM and ADJACENT TERRITORIES in 2018–2019","authors":"I. Gabsatarova, B. Assinovskaya, S.V. Baranov, V. Karpinsky, Y. Konechnaya, L.M. Munirova, L. Nadezhka, N. Noskova, S.I. Petrov, S.P. Pivovarov, I. Sanina","doi":"10.35540/1818-6254.2023.26.17","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.17","url":null,"abstract":"Seismic observations by 48 stationary seismic stations, including twelve temporary seismic stations located in the area of Novovoronezh and Kursk nuclear power plants, were carried out on the Russian territory of the East European Platform. A feature of seismicity in 2018–2019 is a unique Kandalaksha earthquake of November 5, 2019 with ML=3.8 in the Belomorsky region. Its focal mechanism was represented by a normal fault. For the first time, a noticeable earthquake with МL=3.4 was recorded on September 5, 2019 at the Pashninskoye and Beregovoye fields in the Timan-Pechora oil and gas province. It was felt in Neftepechorsk working settlement with an intensity of up to 4 MSK-64. As before, weak natural seismicity was recorded on the Baltic Shield: in Karelia, in areas bordering Finland, near the Kandalaksha Bay, near the Khibiny and Lovozero massifs on the Kola Peninsula, on the Voronezh crystalline massif territory, especially in the zone of its junction with the DnieperDonetsk trough.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"12 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138971844","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}

{"title":"SEISMICITY of the BAIKAL REGION and TRANSBAIKALIA in 2018–2019","authors":"V. Melnikova, N. Gileva, Y. Radziminovich, A. Filippova, E. Kobeleva","doi":"10.35540/1818-6254.2023.26.12","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.12","url":null,"abstract":"We considered a character of the seismic process in the Baikal region and Transbaikalia in 2018–2019. During this time period, 14545 earthquakes with КR≥5.6 were registered. More than 94 % of the seismic events were localized in the Baikal rift zone. Within it, relatively strong earthquakes occurred in Khubsugul-Tunka area (March 29, 2019, Mw=4.8) and in the junction zone of the northeastern flank of the Baikal rift and the Olekma-Stanovoy orogenic system (September 28, 2019, Mw=5.1). 49 earthquakes caused felt macroseismic effects which most often manifested themselves in the settlements of the region with intensity of 3–4 and 4. Intensity of 5–6 was observed in few cases. Earthquake source parameters were determined for 81 seismic events with КR≥9.1. Most of them occurred in the seismotectonic regime of subhorizontal extension. 61 focal mechanisms were determined from P-wave first-motion polarities. Source parameters for 13 earthquakes were estimated using a joint inversion of P-wave first-motion polarities and surface wave amplitude spectra. In general, 2018–2019 are characterized by a moderate level of seismic activity.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138973146","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}

{"title":"SEISMICITY of the ALTAI and SAYAN region in 2018–2019","authors":"A. Emanov, A. Emanov, A. Fateev, E. Shevkunova, V. Podkorytova","doi":"10.35540/1818-6254.2023.26.11","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.11","url":null,"abstract":"The seismicity of the Altai-Sayan region in 2018–2019 is considered. The stationary seismic network within the reporting period consisted of 55 stations. Upgrading the recording equipment and retrofitting the stations with strong motion sensors was continued. In addition to the stationary network, five local networks functioned in the region. One of them investigated the seismic process and accumulated data for constructing the Moho boundary using the method of receiving functions in the Altai Republic, the other four were focused on the study of technogenic seismicity in the area of coal minings of the Kemerovo and Novosibirsk regions. During the reporting period, 15405 earthquakes were registered in the region, 52 % of them occurred in the Chui-Kurai zone of the Altai Mountains, for which a brief description of seismicity is given separately. The total seismic energy released in earthquake foci was 2.191012 J in 2018 and 1.171013 J in 2019. The slope of the linear part of the earthquake recurrence chart for 2018–2019 has not undergone significant changes compared to previous reporting periods. The largest earthquake on the territory of the Altai-Sayan region for the reporting period (ML=6.2) occurred on February 1, 2019 at 21h54m in China, 70 km south of the Zaisan lake","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139002760","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}

{"title":"SEISMICITY of YAKUTIA in 2018–2019","authors":"S.V. Shibaev, W. Geissler, B. Kozmin, R.M. Tuktarov, A.A. Makarov, A.S. Kulyandina","doi":"10.35540/1818-6254.2023.26.16","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.16","url":null,"abstract":"According to the information received from 20 stationary digital seismic stations of the Yakutia Branch of Geophysical Survey of the Russian Academy of Sciences, two-year (2018–2019) seismic monitoring of the territory of the Republic of Sakha (Yakutia) was carried out. During this time interval, more than 730 earthquakes with an energy class of KR≥7.2 (magnitude M≥1.8) were registered. During the previous two years, their number was 801. Manifestations of seismicity fixed the spatial position of the contact zones and their constituent blocks of known lithospheric plates: the Eurasian and North American plates in the northeastern and arctic regions, as well as the Eurasian and Amur plates – in the southern areas of Yakutia. The epicentral fields traced individual relief lineaments and identified active boundary structures combined into two large-scale seismic belts – BaikalStanovoy and Arctic-Asian. Their outlines are seen as bands of earthquake epicenters, elongated from the Olekma River to the Sea of Okhotsk in the south and as ensembles of separate groups and chains of earthquakes between the Laptev and Okhotsk Seas in the northeast and in the Arctic. Significant seismic activity has been detected in the northeast of the region – in the Olekminsk region and the Aldan Highlands (South Yakutia), as well as in the Yano-Oymyakon Highlands, the Chersky Ridge and the Laptev Sea. A map of epicenters was constructed for the entire territory of the region, where 12 districts were identified and an analysis of the seismotectonic situation in each of them was given. The map of Arctic earthquakes in the Lena River delta is considered separately. It is compiled according to the processing of digital seismograms obtained at 25 autonomous field stations installed in accordance with the Russian-German project \"Seismicity and Neotectonics of the Laptev Sea Region\" (SIOLA). In this area during 2016–2019 more than 2 thousand shocks of small energy classes KR≥7.2–10.7 (M≥1.8–3.7) were recorded within the depth interval of 1–36 km of the Earth's crust. The characteristics of the most seismically active local tectonic structures developed in this region are given.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"11 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139002867","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}

{"title":"SEISMICITY of the AMUR and PRIMORYE, SAKHALIN and the KURIL-OKHOTSK REGION in 2018-2019","authors":"T. Fokina, D. Safonov, D. Kostylev","doi":"10.35540/1818-6254.2023.26.13","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.13","url":null,"abstract":"A review of the Amur and Primorye, Sakhalin, and the Kuril-Okhotsk region seismicity for 20182019 is presented on the basis of data from the regional network of stationary seismic stations of the Sakhalin branch of the Geophysical Survey RAS with the involvement of data from adjacent seismological Russian and foreign agencies, as well as ten stations of the local network operating in the south Sakhalin. Parameters of 4989 seismic events have been determined, 193 of them are explosions. Focal mechanisms were calculated for 88 earthquakes. 116 earthquakes have shown a macroseismic effect. A map of the epicenters is presented, the distribution of the number N of crustal and deep-focus earthquakes by a magnitude, a total seismic energy ∑E for seismically active regions of three regions are given, in comparison with the average parameters N and ∑E for 20012017. For each region, an analysis of the parameters of the seismic regime in 20182019 is given in comparison with long-term averages, the maximum and significant seismic events are described. The seismicity of the Priamurye and Primorye, Sakhalin, and the Kuril-Okhotsk region in 20182019 can be characterized as a moderate one.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139001556","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}

{"title":"SEISMICITY of TAJIKISTAN and ADJACENT TERRITORIES in 2018–2019","authors":"T.R. Ulubieva, L.I. Risling, R. Mikhailova","doi":"10.35540/1818-6254.2023.26.09","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.09","url":null,"abstract":"In 2018–2019, seismic monitoring of the territory of Tajikistan with adjacent areas of several states was carried out by a network of 7 digital seismic stations of the Geophysical Servey of the National Academy of Sciences of Tajikistan. For two years, 17195 earthquakes with energy classes KR=8.6–14.9 were registered. Among them 2870 were small–focus (h<70 km), scattered throughout the Southwestern Tien Shan (zone I), Southern Tien Shan (II), the crustal Pamir-Hindu Kush (III), and 14325 – with intermediate depths h=70–310 km, localized in the Pamir-Hindu Kush zone IV. 112 earthquakes were tangible, two of them, Sarikhosor earthquakes of March 29, 2018 with KR=13.1, I0=6 and of March 7, 2019 with KR=12.1, I0=5–6, were surveyed with the construction of isoseist maps and described in a separate article of this issue of the journal. The strongest (Mw>6) earthquakes were grouped in zone IV of Hindu Kush earthquakes with intermediate depths both in 2018 (January 31 with KR=14.8, Mw=6.2, h=200 km and May 9 with KR=14.9, Mw=6.3, h=105 km) and in 2019 (December 20 with KR=14.8, Mw=6.2, h=209 km). All notable earthquakes with foci in the Earth's crust occurred in the Southern Tien Shan zone (II) and associated with a system of near-latitudinal South-Hissar and Ilak-Vakhsh deep faults. Among them the earthquakes occurred in 2018 (March 29 with KR =13.1, N,афт=521; September 17 and December 5 with KR=12.0, N,aft=59) and in 2019 (March 7, KR=12.1, N, aft=53), which were accompanied by large series of aftershocks.","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"13 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138972068","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}

{"title":"SIRETOKO EARTHQUAKES in OCTOBER–NOVEMBER 2018 with Mw=5.7 and 6.0 (KUNASHIR STRAIT, HOKKAIDO ISLAND)","authors":"E.P. Semenova, D.A. Safonov","doi":"10.35540/1818-6254.2023.26.30","DOIUrl":"https://doi.org/10.35540/1818-6254.2023.26.30","url":null,"abstract":"","PeriodicalId":126512,"journal":{"name":"Earthquakes in Northern Eurasia","volume":"2 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139002469","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}