gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2021-12-4-0564gtcrust-1374Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSПОЛЕ ТЕКТОНИЧЕСКИХ НАПРЯЖЕНИЙ НА ПРОМЕЖУТОЧНЫХ ГЛУБИНАХ ЮЖНОГО ФЛАНГА КУРИЛО-КАМЧАТСКОЙ СЕЙСМОФОКАЛЬНОЙ ЗОНЫTECTONIC STRESS FIELD AT INTERMEDIATE DEPTHS OF THE SOUTHERN FLANK OF THE KURIL-KAMCHATKA SEISMIC ZONEСафоновД. А.SafonovD. A.

693022, Южно-Сахалинск, ул. Науки, 1Б

Alexander N. Semenov

1B Nauki St, Yuzhno-Sakhalinsk 693022

semenov@igm.nsc.ruИнститут морской геологии и геофизики ДВО РАНРоссияInstitute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of SciencesRussian Federation202114122021124929950Copyright © Сафонов Д.А., 20212021Сафонов Д.А.Safonov D.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/1374

Исследовано поле ориентаций осей главных тектонических напряжений на участке промежуточных глубин землетрясений южного фланга Курило-Камчатской субдукционной системы отдельно для верхнего и нижнего слоя двойной сейсмофокальной зоны. Привлечены данные каталогов NIED и GlobalCMT. Результаты расчетов представлены в виде схем напряженного состояния изучаемых областей и таблиц. Для района южных Курильских островов подтверждено преобладание направления напряжений наибольшего сжатия вдоль плоскости слэба в верхнем слое и наименьшего сжатия (девиаторного растяжения) в нижнем. Однако направление главных осей наибольшего и наименьшего сжатия смещено относительно направления падения слэба: против часовой стрелки на 30–40° для оси сжатия в верхнем слое, что совпадает с направлением движения плиты, по часовой стрелке для оси растяжения в нижнем слое. Это может являться следствием правосторонней сдвиговой компоненты в поддвиге Тихоокеанской плиты. В отличие от общей закономерности, по ориентации главных осей поле напряжений под центральной частью сегментов, относящихся к о. Хоккайдо, в верхнем слое практически идентично нижнему слою. Также выявлены участки, находящиеся в условиях сдвиговых напряжений, самые протяженные – напротив северной части о. Кунашир и под южной частью о. Хоккайдо. Показано хорошее соответствие результатов для основных крупных групп кластеров данным других авторов. Расхождения в первую очередь касаются небольших групп обособленных кластеров, показывающих локальные неоднородности поля напряжений.

The study has been done on the orientation of the principal axes of tectonic stress field at intermediate depths of earthquakes of the southern flank of the Kuril-Kamchatka subduction system separately for the upper and lower double seismic focal zones. Use has been made of the NIED and GlobalCMT catalogue data. The computation-based results are presented on schemes of the stressed state of the investigated areas and in tables. In the context of the southern Kuril Islands, evidence has been provided for predominance of the maximum compressive stresses along the slab plane in the upper layer and minimal compressive stresses (deviation extension) in the lower layer. However, the principal axes of maximum and minimum compression are displaced in direction relative to the slab dip: by 30–40° counterclockwise for the compression axis in the upper layer, which coincides with the direction of plate movement, and clockwise for the extension axis in the lower layer. This might be caused by the right-lateral strike-slip component of the Pacific Plate subduction. Unlike the general trend, the orientation of the principal axes of the stress field beneath the central Hokkaido-related segments in the upper layer is almost identical to that in the lower layer. There have also been found the segments exposed to shear stress, with the most extensive located opposite the northern Kunashir Island and beneath the southern Hokkaido Island. The results obtained for major large groups of clusters show good accordance with those published by other authors. The discrepancies relate primarily to small groups of isolated clusters showing local stress field heterogeneities.

 

Курило-Охотский региондвойная сейсмофокальная зонаполе тектонических напряженийслэбпромежуточные глубиныKuril-Okhotsk regiondouble seismic focal zonetectonic stress fieldslabintermediate depthРабота выполнена в рамках государственного задания ИМГиГ ДВО РАНThe work was funded from the government budget for the IMGG FEB RASReferencesÁlvarez-Gómez J.A., 2019. FMC–Earthquake Focal Mechanisms Data Management, Cluster and Classification. SoftwareX 9, 299–307. https://doi.org/10.1016/j.softx.2019.03.008.Álvarez-Gómez J.A., 2019. FMC–Earthquake Focal Mechanisms Data Management, Cluster and Classification. SoftwareX 9, 299–307. https://doi.org/10.1016/j.softx.2019.03.008.Astiz L., Lay T., Kanamori H., 1988. Large Intermediate-Depth Earthquakes and the Subduction Process. Physics of the Earth and Planetary Interiors 53 (1–2), 80–166. https://doi.org/10.1016/0031-9201(88)90138-0.Astiz L., Lay T., Kanamori H., 1988. Large Intermediate-Depth Earthquakes and the Subduction Process. Physics of the Earth and Planetary Interiors 53 (1–2), 80–166. https://doi.org/10.1016/0031-9201(88)90138-0.Борискина Н.Г., Касаткин С.А., Хомич В.Г. Геология, геодинамика и благороднометалльное оруденение южного фланга Курильской островодужной системы // Успехи современного естествознания. 2019. № 8. С. 44–49.Boriskina N.G., Kasatkin S.A., Khomich V.G., 2019. Geology, Geodynamics and Noble Metals Mineralization in the Southern Flank of the Kuril Island-Arc System. Advances in Current Natural Sciences 8, 44–49 (in Russian)Chen P.F., Bina C.R., Okal E.A., 2004. A Global Survey of Stress Orientations in Subducting Slabs as Revealed by Intermediate-Depth Earthquakes. Geophysical Journal International 159 (2), 721–733. https://doi.org/10.1111/j.1365-246X.2004.02450.x.Chen P.F., Bina C.R., Okal E.A., 2004. A Global Survey of Stress Orientations in Subducting Slabs as Revealed by Intermediate-Depth Earthquakes. Geophysical Journal International 159 (2), 721–733. https://doi.org/10.1111/j.1365-246X.2004.02450.x.Christova C.V., 2015. Spatial Distribution of the Contemporary Stress Field in the Kurile Wadati-Benioff Zone by Inversion of Earthquake Focal Mechanisms. Journal of Geodynamics 83, 1–17. https://doi.org/10.1016/j.jog.2014.11.001.Christova C.V., 2015. Spatial Distribution of the Contemporary Stress Field in the Kurile Wadati-Benioff Zone by Inversion of Earthquake Focal Mechanisms. Journal of Geodynamics 83, 1–17. https://doi.org/10.1016/j.jog.2014.11.001.Christova C., Hirata N., Kato A., 2006. Contemporary Stress Field in the Wadati-Benioff Zone at the Japan-Kurile Arc-Arc Junction (North Honshu, the Hokkaido Corner and Hokkaido Island) by Inversion of Earthquake Focal Mechanisms. Bulletin of the Earthquake Research Institute 81, 1–18.Christova C., Hirata N., Kato A., 2006. Contemporary Stress Field in the Wadati-Benioff Zone at the Japan-Kurile Arc-Arc Junction (North Honshu, the Hokkaido Corner and Hokkaido Island) by Inversion of Earthquake Focal Mechanisms. Bulletin of the Earthquake Research Institute 81, 1–18.Christova C., Tsapanos T., 2000. Depth Distribution of Stresses in the Hokkaido Wadati-Benioff Zone as Deduced by Inversion of Earthquake Focal Mechanisms. Journal of Geodynamics 30 (5), 557–573. https://doi.org/10.1016/S0264-3707(00)00009-0.Christova C., Tsapanos T., 2000. Depth Distribution of Stresses in the Hokkaido Wadati-Benioff Zone as Deduced by Inversion of Earthquake Focal Mechanisms. Journal of Geodynamics 30 (5), 557–573. https://doi.org/10.1016/S0264-3707(00)00009-0.Faccenda M., Gerya T.V., Mancktelow N.S., Moresi L., 2012. Fluid Flow during Slab Unbending and Dehydration: Implications for Intermediate‐Depth Seismicity, Slab Weakening and Deep Water Recycling. Geochemistry, Geophysics, Geosystems 13 (1). https://doi.org/10.1029/2011GC003860.Faccenda M., Gerya T.V., Mancktelow N.S., Moresi L., 2012. Fluid Flow during Slab Unbending and Dehydration: Implications for Intermediate‐Depth Seismicity, Slab Weakening and Deep Water Recycling. Geochemistry, Geophysics, Geosystems 13 (1). https://doi.org/10.1029/2011GC003860.Fujita K., Kanamori H., 1981. Double Seismic Zones and Stresses of Intermediate Depth Earthquakes. Geophysical Journal International 66 (1), 131–156. https://doi.org/10.1111/j.1365-246X.1981.tb05950.x.Fujita K., Kanamori H., 1981. Double Seismic Zones and Stresses of Intermediate Depth Earthquakes. Geophysical Journal International 66 (1), 131–156. https://doi.org/10.1111/j.1365-246X.1981.tb05950.x.Gephart J.W., Forsyth D.W., 1984. An Improved Method for Determining the Regional Stress Tensor Using Earthquake Focal Mechanism Data: Application to the San Fernando Earthquake Sequence. Journal of Geophysical Research: Solid Earth 89 (B11), 9305–9320. https://doi.org/10.1029/JB089iB11p09305.Gephart J.W., Forsyth D.W., 1984. An Improved Method for Determining the Regional Stress Tensor Using Earthquake Focal Mechanism Data: Application to the San Fernando Earthquake Sequence. Journal of Geophysical Research: Solid Earth 89 (B11), 9305–9320. https://doi.org/10.1029/JB089iB11p09305.Ghimire S., Kasahara M., 2009. Spatial Variation in Seismotectonics and Stress Conditions across the Kurile and Japan Trenches Inferred from the Analysis of Focal Mechanism Data in Hokkaido, Northern Japan. Journal of Geodynamics 47 (2–3), 153–166. https://doi.org/10.1016/j.jog.2008.07.007.Ghimire S., Kasahara M., 2009. Spatial Variation in Seismotectonics and Stress Conditions across the Kurile and Japan Trenches Inferred from the Analysis of Focal Mechanism Data in Hokkaido, Northern Japan. Journal of Geodynamics 47 (2–3), 153–166. https://doi.org/10.1016/j.jog.2008.07.007.Global CMT Catalog, 2020. Available from: https://www.globalcmt.org/CMTsearch.html (Last accessed November 16, 2020).Global CMT Catalog, 2020. Available from: https://www.globalcmt.org/CMTsearch.html (Last accessed November 16, 2020).Hasegawa A., Umino N., Takagi A., 1978. Double-Planed Structure of the Deep Seismic Zone in the Northeastern Japan Arc. Tectonophysics 47 (1–2), 43–58. https://doi.org/10.1016/0040-1951(78)90150-6.Hasegawa A., Umino N., Takagi A., 1978. Double-Planed Structure of the Deep Seismic Zone in the Northeastern Japan Arc. Tectonophysics 47 (1–2), 43–58. https://doi.org/10.1016/0040-1951(78)90150-6.Hayes G.P., Moore G.L., Portner D.E., Hearne M., Flamme H., Furtney M., Smoczyk G.M., 2018. Slab2, a Comprehensive Subduction Zone Geometry Model. Science 362 (6410), 58–61. https://doi.org/10.1126/science.aat4723.Hayes G.P., Moore G.L., Portner D.E., Hearne M., Flamme H., Furtney M., Smoczyk G.M., 2018. Slab2, a Comprehensive Subduction Zone Geometry Model. Science 362 (6410), 58–61. https://doi.org/10.1126/science.aat4723.Jiao W., Silver P.G., Fei Y., Prewitt C.T., 2000. Do Intermediate‐and Deep‐Focus Earthquakes Occur on Preexisting Weak Zones? An Examination of the Tonga Subduction Zone. Journal of Geophysical Research: Solid Earth 105 (B12), 28125–28138. https://doi.org/10.1029/2000JB900314.Jiao W., Silver P.G., Fei Y., Prewitt C.T., 2000. Do Intermediate‐and Deep‐Focus Earthquakes Occur on Preexisting Weak Zones? An Examination of the Tonga Subduction Zone. Journal of Geophysical Research: Solid Earth 105 (B12), 28125–28138. https://doi.org/10.1029/2000JB900314.Kasahara J., Sato T., Mochizuki K., Kobayashi K., 1997. Paleotectonic Structures and Their Influence on Recent Seismo‐Tectonics in the South Kuril Subduction Zone. Island Arc 6 (3), 267–280. https://doi.org/10.1111/j.1440-1738.1997.tb00177.x.Kasahara J., Sato T., Mochizuki K., Kobayashi K., 1997. Paleotectonic Structures and Their Influence on Recent Seismo‐Tectonics in the South Kuril Subduction Zone. Island Arc 6 (3), 267–280. https://doi.org/10.1111/j.1440-1738.1997.tb00177.x.Kasahara M., Sasatani T., 1985. Source Characteristics of the Kunashiri Strait Earthquake of December 6, 1978 as Deduced from Strain Seismograms. Physics of the Earth and Planetary Interiors 37 (2–3), 124–134. https://doi.org/10.1016/0031-9201(85)90046-9.Kasahara M., Sasatani T., 1985. Source Characteristics of the Kunashiri Strait Earthquake of December 6, 1978 as Deduced from Strain Seismograms. Physics of the Earth and Planetary Interiors 37 (2–3), 124–134. https://doi.org/10.1016/0031-9201(85)90046-9.Katsumata K., Wada N., Kasahara M., 2003. Newly Imaged Shape of the Deep Seismic Zone within the Subducting Pacific Plate beneath the Hokkaido Corner, Japan‐Kurile Arc‐Arc Junction. Journal of Geophysical Research: Solid Earth 108 (B12). https://doi.org/10.1029/2002JB002175.Katsumata K., Wada N., Kasahara M., 2003. Newly Imaged Shape of the Deep Seismic Zone within the Subducting Pacific Plate beneath the Hokkaido Corner, Japan‐Kurile Arc‐Arc Junction. Journal of Geophysical Research: Solid Earth 108 (B12). https://doi.org/10.1029/2002JB002175.Kirby S.H., Durham W.B., Stern L.A., 1991. Mantle Phase Changes and Deep-Earthquake Faulting in Subducting Lithosphere. Science 252 (5003), 216–225. https://doi.org/10.1126/science.252.5003.216.Kirby S.H., Durham W.B., Stern L.A., 1991. Mantle Phase Changes and Deep-Earthquake Faulting in Subducting Lithosphere. Science 252 (5003), 216–225. https://doi.org/10.1126/science.252.5003.216.Lay T., Ammon C.J., Kanamori H., Kim M.J., Xue L., 2011. Outer Trench-Slope Faulting and the 2011 Mw 9.0 off the Pacific Coast of Tohoku Earthquake. Earth, Planets and Space 63 (37), 713–718. https://doi.org/10.5047/eps.2011.05.006.Lay T., Ammon C.J., Kanamori H., Kim M.J., Xue L., 2011. Outer Trench-Slope Faulting and the 2011 Mw 9.0 off the Pacific Coast of Tohoku Earthquake. Earth, Planets and Space 63 (37), 713–718. https://doi.org/10.5047/eps.2011.05.006.NIED F-net Broadband Seismograph Network, 2020. Available from: http://www.fnet.bosai.go.jp (Last accessed November 16, 2020).NIED F-net Broadband Seismograph Network, 2020. Available from: http://www.fnet.bosai.go.jp (Last accessed November 16, 2020).Ozel N., Moriya T., 1999. Different Stress Directions in the Aftershock Focal Mechanisms of the Kushiro-Oki Earthquake of Jan. 15, 1993, SE Hokkaido, Japan, and Horizontal Rupture in the Double Seismic Zone. Tectonophysics 313 (3), 307–327. https://doi.org/10.1016/S0040-1951(99)00207-3.Ozel N., Moriya T., 1999. Different Stress Directions in the Aftershock Focal Mechanisms of the Kushiro-Oki Earthquake of Jan. 15, 1993, SE Hokkaido, Japan, and Horizontal Rupture in the Double Seismic Zone. Tectonophysics 313 (3), 307–327. https://doi.org/10.1016/S0040-1951(99)00207-3.Полец А.Ю. Напряженно-деформированное состояние зоны глубокофокусных землетрясений региона Японского моря // Геосистемы переходных зон. 2018. Т. 2. № 4. С. 302–311. http://dx.doi.org/10.30730/2541-8912.2018.2.4.302-311.Polets A.Yu., 2018. The Stress-Strained State of Zones of Deep-Focus Earthquakes of the Japan Sea Region. Geosystems of Transition Zones 2 (4), 302–311 (in Russian) http://dx.doi.org/10.30730/2541-8912.2018.2.4.302-311.Поплавская Л.Н., Рудик М.И., Нагорных Т.В., Сафонов Д.А. Каталог механизмов очагов сильных (М≥6.0) землетрясений Курило-Охотского региона 1964–2009 гг. Владивосток: Дальнаука, 2011. 131 с.Poplavskaya L.N., Rudik M.I., Nagornykh T.V., Safonov D.A., 2011. Catalogue of Focal Mechanisms of Strong (М≥6.0) Earthquakes in the Kuril-Okhotsk Region of 1964–2009. Dal’nauka, Vladivostok, 131 p. (in Russian)Prytkov A.S., Vasilenko N.F., Frolov D.I., 2017. Recent Geodynamics of the Kuril Subduction Zone. Russian Journal of Pacific Geology 11, 19–24. https://doi.org/10.1134/S1819714017010067.Prytkov A.S., Vasilenko N.F., Frolov D.I., 2017. Recent Geodynamics of the Kuril Subduction Zone. Russian Journal of Pacific Geology 11, 19–24. https://doi.org/10.1134/S1819714017010067.Rebetsky Yu.L., 1999. Methods for Reconstructing Tectonic Stresses and Seismotectonic Deformations Based on the Modern Theory of Plasticity. Doklady Earth Sciences 365 (3), 370–373.Rebetsky Yu.L., 1999. Methods for Reconstructing Tectonic Stresses and Seismotectonic Deformations Based on the Modern Theory of Plasticity. Doklady Earth Sciences 365 (3), 370–373.Ребецкий Ю.Л. Развитие метода катакластического анализа сколов для оценки величин тектонических напряжений // Доклады Академии наук. 2003 Т. 388. № 2. С. 237–241.Rebetsky Yu.L., 2003. Development of the Cataclastic Analysis Method of Slip Faults for Tectonic Stress Estimation. Doklady Earth Sciences 388 (2), 237–241 (in Russian)Ребецкий Ю.Л. Тектонические напряжения и прочность горных массивов. М.: Наука, 2007. 406 с.Rebetsky Yu.L., 2007. Tectonic Stresses and Strength of Mountain Ranges. Nauka, Moscow, 406 p. (in Russian)Ребецкий Ю.Л., Полец А.Ю. Напряженное состояние литосферы Японии перед катастрофическим землетрясением Тохоку 11.03.2011 // Геодинамика и тектонофизика. 2014. Т. 5. № 2. С. 469–506. https://doi.org/10.5800/GT-2014-5-2-0137.Rebetsky Yu.L., Polets A.Yu., 2014. The State of Stresses of the Lithosphere of Japan before the Catastrophic Tohoku Earthquake of 11 March 2011. Geodynamics & Tectonophysics 5 (2), 469–506 (in Russian) https://doi.org/10.5800/GT-2014-5-2-0137.Rebetsky Yu.L., Polets A.Yu., 2019. The State of Stress in the Aftershock Area of the March 11, 2011 Tohoku Earthquake. In: Geodynamical Processes and Natural Hazards. Proceedings of the III National Scientific Conference with Foreign Participants (May 27–31, 2019, Yuzhno-Sakhalinsk). IOP Conference Series: Earth and Environmental Science 324, 012005. http://dx.doi.org/10.1088/1755-1315/324/1/012005.Rebetsky Yu.L., Polets A.Yu., 2019. The State of Stress in the Aftershock Area of the March 11, 2011 Tohoku Earthquake. In: Geodynamical Processes and Natural Hazards. Proceedings of the III National Scientific Conference with Foreign Participants (May 27–31, 2019, Yuzhno-Sakhalinsk). IOP Conference Series: Earth and Environmental Science 324, 012005. http://dx.doi.org/10.1088/1755-1315/324/1/012005.Родкин М.В., Рундквист Д.В. Геофлюидогеодинамика. Приложение к сейсмологии, тектонике, процессам рудо- и нефтегенеза. Долгопрудный: Интеллект, 2017. 288 с.Rodkin M.V., Rundkvist D.V., 2017. Geofluid Geodynamics. Application to Seismology, Tectonics, Ore and Oil Genesis Processes. Intellect, Dolgoprudny, 288 p. (in Russian)Сафонов Д.А. Пространственное распределение тектонических напряжений в южной глубокой части Курило-Камчатской зоны субдукции // Геосистемы переходных зон. 2019. Т. 3. № 2. С. 175–188. http://dx.doi.org/10.30730/2541-8912.2019.3.2.175-188.Safonov D.A., 2019. Spatial Distribution of Tectonic Stress in the Southern Deep Part of the Kuril-Kamchatka Subduction Zone. Geosystems of Transition Zones 3 (2), 175–188 (in Russian) http://dx.doi.org/10.30730/2541-8912.2019.3.2.175-188.Сафонов Д.А. Реконструкция поля тектонических напряжений глубокой части южного сегмента Курило-Камчатской и северного сегмента Японской зоны субдукции // Геодинамика и тектонофизика. 2020. Т. 11. № 4. С. 743–755. https://doi.org/10.5800/GT-2020-11-4-0504.Safonov D.A., 2020. Reconstruction of the Tectonic Stress Field in the Deep Parts of the Southern Kuril-Kamchatka and Northern Japan Subduction Zones. Geodynamics & Tectonophysics 11 (4), 743–755 (in Russian) https://doi.org/10.5800/GT-2020-11-4-0504.Safonov D.A., Konovalov A.V., Zlobin T.K., 2015. The Urup Earthquake Sequence of 2012–2013. Journal of Volcanology and Seismology 9, 402–411. https://doi.org/10.1134/S074204631506007X.Safonov D.A., Konovalov A.V., Zlobin T.K., 2015. The Urup Earthquake Sequence of 2012–2013. Journal of Volcanology and Seismology 9, 402–411. https://doi.org/10.1134/S074204631506007X.Селивёрстов Н.И. Структура сейсмофокальной зоны Камчатки // Вестник КРАУНЦ. Серия: Науки о Земле. 2007. Вып. 9. № 1. С. 10–26.Seliverstov N.I., 2007. Structure of Kamchatka Seismo-Focal Zone. Bulletin of Kamchatka Regional Association "Educational-Scientific Center". Earth Sciences 1 (9), 10–26 (in Russian)Sykes L.R., 1966. The Seismicity and Deep Structure of Island Arcs. Journal of Geophysical Research 71 (12), 2981–3006. https://doi.org/10.1029/JZ071i012p02981.Sykes L.R., 1966. The Seismicity and Deep Structure of Island Arcs. Journal of Geophysical Research 71 (12), 2981–3006. https://doi.org/10.1029/JZ071i012p02981.Terakawa T., Matsu’ura M., 2010. The 3‐D Tectonic Stress Fields in and around Japan Inverted from Centroid Moment Tensor Data of Seismic Events. Tectonics 29 (6). https://doi.org/10.1029/2009TC002626.Terakawa T., Matsu’ura M., 2010. The 3‐D Tectonic Stress Fields in and around Japan Inverted from Centroid Moment Tensor Data of Seismic Events. Tectonics 29 (6). https://doi.org/10.1029/2009TC002626.Шикотанское землетрясение и цунами 4(5) октября 1994 года // Хроника событий, анализ последствий и современное состояние проблемы: Сборник статей / Ред. И.Н. Тихонов, Г.В. Шевченко. Южно-Сахалинск: ИМГиГ ДВО РАН, 2015. 128 с.Tikhonov I.N., Shevchenko G.V. (Eds), 2015. Shikotan Earthquake and Tsunami of October 4(5), 1994. Chronicle Events, Impact Analysis and Current State of the Problem. Collection of Articles. IMGG FEB RAS, Yuzhno-Sakhalinsk, 128 p. (in Russian)Zlobin T.K., Safonov D.A., Polets A.Yu., 2011. Distribution of Earthquakes by the Types of the Source Motions in the Kuril-Okhotsk Region. Doklady Earth Sciences 440, 1410–1412. https://doi.org/10.1134/S1028334X11100096.Zlobin T.K., Safonov D.A., Polets A.Yu., 2011. Distribution of Earthquakes by the Types of the Source Motions in the Kuril-Okhotsk Region. Doklady Earth Sciences 440, 1410–1412. https://doi.org/10.1134/S1028334X11100096.

The authors declare that there are no conflicts of interest present.