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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">gtcrust</journal-id><journal-title-group><journal-title xml:lang="ru">Геодинамика и тектонофизика</journal-title><trans-title-group xml:lang="en"><trans-title>Geodynamics &amp; Tectonophysics</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2078-502X</issn><publisher><publisher-name>Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.5800/GT-2022-13-3-0639</article-id><article-id custom-type="elpub" pub-id-type="custom">gtcrust-1532</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>СОВРЕМЕННАЯ ГЕОДИНАМИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>RECENT GEODYNAMICS</subject></subj-group></article-categories><title-group><article-title>МЕХАНИЗМЫ ОЧАГОВ ЗЕМЛЕТРЯСЕНИЙ В ЗАПАДНОЙ ЗОНЕ СУБДУКЦИИ ТИХООКЕАНСКОЙ ЛИТОСФЕРНОЙ ПЛИТЫ В ЗАВИСИМОСТИ ОТ ОСОБЕННОСТЕЙ ЕЕ ПОГРУЖЕНИЯ</article-title><trans-title-group xml:lang="en"><trans-title>FOCAL MECHANISMS OF EARTHQUAKES IN THE SUBDUCTION ZONE OF THE WESTERN PACIFIC PLATE</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бушенкова</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Bushenkova</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>630090, Новосибирск, пр-­т Академика Коптюга, 3, Россия </p></bio><bio xml:lang="en"><p>3 Academician Koptyug Ave, Novosibirsk 630090, Russia </p></bio><email xlink:type="simple">BushenkovaNA@ipgg.sbras.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кучай</surname><given-names>О. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kuchay</surname><given-names>O. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>630090, Новосибирск, пр-­т Академика Коптюга, 3, Россия</p></bio><bio xml:lang="en"><p>3 Academician Koptyug Ave, Novosibirsk 630090, Russia</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт нефтегазовой геологии и геофизики им. А.А. Трофимука СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>20</day><month>09</month><year>2022</year></pub-date><volume>13</volume><issue>3</issue><fpage>639</fpage><lpage>639</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Бушенкова Н.А., Кучай О.А., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Бушенкова Н.А., Кучай О.А.</copyright-holder><copyright-holder xml:lang="en">Bushenkova N.A., Kuchay O.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.gt-crust.ru/jour/article/view/1532">https://www.gt-crust.ru/jour/article/view/1532</self-uri><abstract><p>Исследуются особенности деформирования погружающейся Тихоокеанской литосферной плиты по данным механизмов очагов землетрясений. Территория включает зоны конвергентных границ Тихоокеанской плиты с Северо-Американской (в районе Алеутской дуги), Охотоморской, Евразийской и Филиппинской плитами.</p><p>Показано, что угол наклона Тихоокеанской плиты в зоне субдукции Алеутской дуги оказывает влияние на механизмы очагов землетрясений, произошедших в верхней части (до 35 км) океанической плиты в области ее изгиба. При крутом наклоне погружения плиты возникают сбросовые смещения в очагах, при пологом – редкие надвиговые землетрясения. Азимутальная ориентация Р-осей механизмов очагов землетрясений верхней части зоны контакта (1–70 км) соответствует направлению вектора смещения Тихоокеанской плиты при погружении ее фрагментов к западу-северо-западу. Глубже 70 км в погружающейся плите происходит изменение азимутальной ориентации осей сжатия: они занимают разные азимутальные секторы и, фиксируется разнообразная ориентация их наклона, ориентации осей Т становятся разнонаправленными.</p><p>На основе данных о механизмах очагов 7768 землетрясений выполнен расчет сейсмотектонических деформаций. Выявлено, что поля деформаций Ехх и Еzz наиболее однородны для глубин 1–70 км. Картина сейсмотектонических деформаций резко меняется для глубоких частей погружающейся плиты (105–200, 200–400 и 400–700 км), наблюдаются неоднородные поля деформаций Ехх, Еуу, Еzz с перемежающимися участками удлинений и укорочений.</p><p>Предложена авторская схема влияния структуры конвекции в верхней мантии на геометрию погружающейся плиты (слэба) как вероятного катализатора процессов, ответственных за раздельность зон сейсмоактивности и смену типов землетрясений с глубиной и в разных частях протяженной зоны субдукции.</p></abstract><trans-abstract xml:lang="en"><p>Deformation features of the subducting Pacific lithospheric plate are considered according to the data on earthquake focal mechanisms. The territory includes the convergent boundaries between the Pacific Plate and the North American (in the Aleutian arc region), the Okhotsk, the Eurasian and the Philippine plates.</p><p>It has been shown that the angle of subducting Pacific Plate in the Aleutian subduction zone affects the focal mechanisms of earthquakes that occurred in the upper, 35 km part of the oceanic plate in the zone of its bending. There occur normal-fault earthquakes at a steep-angle subduction and rare thrust earthquakes at a shallow-angle subduction. The azimuthal orientation of P-axes of the focal mechanism solutions in the upper (1–70 km) contact zone corresponds to the Pacific Plate displacement vector when the plate fragments are subducting west-northwestwards. There occurs a change in azimuthal orientation of the compression axes in the subducting plate at a depth of more than 70 km: the axes occupy different azimuthal sectors showing difference in the orientation of their slope, with the orientations of the T-axes become multidirectional.</p><p>The calculation of seismotectonic deformations was carried out based on the data on focal mechanisms of 7768 earthquakes. It was revealed that the Exx and Ezz deformation fields are the most homogeneous at depths of 1–70 km. The pattern of seismotectonic deformations changes abruptly for deep parts of the subducting plate (105–200, 200–400, and 400–700 km), there are observed heterogeneous deformation fields Exx, Eyy and Еzz with alternating episodes of extension and shortening.</p><p>There has been proposed the author’s scheme of the influence of the upper mantle convection structure on the geometry of the subducting plate (slab) as a potential catalyst for the processes responsible for the separation of seismic activity zones and the change of earthquake types with depth and in different parts of the extended subduction zone.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>механизм очага землетрясения</kwd><kwd>Тихоокеанская литосферная плита</kwd><kwd>Алеутская дуга</kwd><kwd>Курило­Камчатская дуга</kwd><kwd>Японская дуга</kwd><kwd>Филиппинская дуга</kwd><kwd>сейсмичность зон конвергентных границ</kwd></kwd-group><kwd-group xml:lang="en"><kwd>earthquake focal mechanism</kwd><kwd>Pacific lithospheric plate</kwd><kwd>Aleutian arc</kwd><kwd>Kuril-Kamchatka arc</kwd><kwd>Japanese arc</kwd><kwd>Filipino arc</kwd><kwd>seismicity of convergent boundary zones</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке проектов ФНИ № FWZZ-2022-0017 и FWZZ-2022-0021.</funding-statement><funding-statement xml:lang="en">This study is supported by FWZZ-2022-0017 and FWZZ-2022-0021 projects of the Program of Fundamental Scientific Research.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Andreeva M.Yu., Rodkin M.V., 2017. 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