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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-2020-11-2-0477</article-id><article-id custom-type="elpub" pub-id-type="custom">gtcrust-1035</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>ДЕФОРМАЦИИ В ЦЕНТРАЛЬНО-АМЕРИКАНСКОЙ ЗОНЕ СУБДУКЦИИ ПО ДАННЫМ МЕХАНИЗМОВ ОЧАГОВ ЗЕМЛЕТРЯСЕНИЙ И ИХ ОСОБЕННОСТИ В РАЙОНЕ ЗЕМЛЕТРЯСЕНИЯ ЧЬЯПАС, МЕКСИКА, 2017 г., МW=8.2</article-title><trans-title-group xml:lang="en"><trans-title>DEFORMATIONS IN THE MIDDLE AMERICA TRENCH ACCORDING TO EARTHQUAKE FOCAL MECHANISMS AND THEIR FEATURES IN THE AREA OF THE 2017 МW 8.2 CHIAPAS EARTHQUAKE, MEXICO</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5345-9331</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дядьков</surname><given-names>П. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Dyadkov</surname><given-names>P. G.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">dyadkovpg@ipgg.sbras.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1627-1115</contrib-id><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"/><bio xml:lang="en"/><email xlink:type="simple">kuchayoa@ipgg.nsc.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5072-5582</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Романенко</surname><given-names>Ю. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Romanenko</surname><given-names>Y. M.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">romanenkoym@ipgg.sbras.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9504-0395</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Джумагалиева</surname><given-names>З. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Dzhumagaliyeva</surname><given-names>Z. S.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">zarina-dzhumagal@bk.ru</email><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 RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>20</day><month>06</month><year>2020</year></pub-date><volume>11</volume><issue>2</issue><fpage>320</fpage><lpage>333</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Дядьков П.Г., Кучай О.А., Романенко Ю.М., Джумагалиева З.С., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Дядьков П.Г., Кучай О.А., Романенко Ю.М., Джумагалиева З.С.</copyright-holder><copyright-holder xml:lang="en">Dyadkov P.G., Kuchay O.A., Romanenko Y.M., Dzhumagaliyeva Z.S.</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/1035">https://www.gt-crust.ru/jour/article/view/1035</self-uri><abstract><p>Сейсмотектонические деформации в Центрально-Американской зоне субдукции и их особенности в районе подготовки землетрясения Чьяпас, Мw=8.2, 8.09.2017 г., определены по данным о 2244 механизмах очагов землетрясений за период 1977–2017 гг. Детально изучено распределение сейсмичности с глубиной. Уменьшение глубины распространения зоны Беньофа в северо-западных сегментах субдукции и увеличение в юго-восточных связываются с возрастом субдуцирующих частей плиты Кокос и углом их погружения. Последний механизм может объяснять также факт наличия землетрясений со сбросовыми подвижками на океаническом поднятии Центрально-Американской зоны субдукции в юго-восточных сегментах и их отсутствие в северо-западных. В целом характерный для зон субдукции тип деформирования среды имеет в Центрально- Американской зоне субдукции ряд особенностей. Преобладание на глубинах до 35 км укорочения по горизонтальным компонентам и удлинения по вертикальной сменяется в интервале глубин 36–70 км переходным типом с мозаичным распределением деформаций разного знака и еще ниже, в диапазоне глубин 70–105 км, характеризуется противоположным по отношению к верхнему горизонту типом деформаций. Землетрясение Чьяпас произошло на границе областей с разным типом деформирования, что свидетельствует о наличии условий разупрочнения блочной среды к западу от гипоцентра и ее стеснения к востоку. Подобный характер состояния среды может указывать на наличие зоны деформационной тени в области подготовки землетрясения Чьяпас.</p></abstract><trans-abstract xml:lang="en"><p>Seismotectonic deformations in the Middle America Trench and their features in the area of preparation of the Chiapas earthquake, МW=8.2, 08 September 2017, were determined using the data on 2244 focal mechanisms of earthquakes for the period of 1977–2017. The distribution of seismicity with depth was studied in detail. The decrease in the depth of the Benioff zone in the north-western subduction segments and the increase in the south-eastern segments is associated with the age of the subducting parts of the Cocos plate and the angle of their immersion. The latter mechanism can also explain the presence of earthquakes with normal focal mechanism on the oceanic uplift in the south-eastern segments of the subduction zone and their absence in the north-western ones. In general, the typical character of subduction deformations has a number of features in the Middle America Trench. The predominance of shortening by horizontal components and elongation by vertical ones at depths up to 35 km is replaced by the transitional type with mosaic distribution of deformations of different signs in the depth range of 36–70 km. Even lower, in the depth range of 70–105 km, the type of deformation changes to the opposite with respect to the upper horizon. The Chiapas earthquake occurred on the border of regions with different types of deformation, which indicates softening of the block’s medium to the west of the hypocenter and its hardening to the east. Such a state of the lithospheric medium may indicate the presence of a deformation shadow zone in the Chiapas earthquake preparation area.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>Центрально-Американская зона субдукции</kwd><kwd>землетрясение Чьяпас 2017 г. в Мексике</kwd><kwd>плита Кокос</kwd><kwd>сейсмотектоническая деформация</kwd><kwd>механизм очага землетрясения</kwd><kwd>зона Беньофа</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Middle America Trench</kwd><kwd>the 2017 Chiapas earthquake in Mexico</kwd><kwd>Kokos plate</kwd><kwd>seismotectonic deformation</kwd><kwd>earthquake focal mechanism</kwd><kwd>Benioff zone</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при частичной поддержке РФФИ (проект № 17-05-01234) и ФНИ (проекты № 0331-2019-0006, 0331-2019-0012).</funding-statement><funding-statement xml:lang="en">The study received a partial financial support from the RFBR (project 17-05-01234) and the BRF (projects 0331-2019-0006 and 0331-2019-0012).</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">Alvarado G.E., Benito B., Staller A., Climent Á., Camacho E., Rojas W., Marroquín G., Molina E., Talavera J.E., MartínezCuevas S., Lindholm C., 2017. 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