gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2017-8-3-0311gtcrust-384Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSСЕЙСМОТЕКТОНИЧЕСКИЕ ДЕФОРМАЦИИ ЗОНЫ КОНТАКТА ЛИТОСФЕРНЫХ ПЛИТ НАСКА И ЮЖНО-АМЕРИКАНСКОЙ В СВЯЗИ С ЗЕМЛЕТРЯСЕНИЕМ МАУЛЕ, МW 8.8, 27.02.2010 Г.SEISMOTECTONIC DEFORMATION IN THE CONTACT AREA OF THE NAZCA AND SOUTH AMERICAN LITHOSPHERIC PLATES IN RELATION TO THE FEBRUARY 27, 2010 MW 8.8 MAULE EARTHQUAKEДядьковП. Г.DyadkovP. G.

канд. геол.-мин. наук, в.н.с.,

630090, Новосибирск, проспект академика Коптюга, 3,

630090, Новосибирск, ул. Пирогова, 2

Candidate of Geology and Mineralogy, Lead Researcher,

3 Academician Koptug ave., Novosibirsk 630090,

2 Pirogov street, Novosibirsk 630090

DyadkovPG@ipgg.sbras.ruКучайО. А.KuchayO. A.

канд. физ.-мат. наук, с.н.с.,

630090, Новосибирск, проспект академика Коптюга, 3

Candidate of Physics and Mathematics, Senior Researcher,

3 Academician Koptug ave., Novosibirsk 630090

KuchayOA@ipgg.nsc.ruРоманенкоЮ. М.RomanenkoYu. M.

н.с.,

630090, Новосибирск, проспект академика Коптюга, 3

Researcher,

3 Academician Koptug ave., Novosibirsk 630090

RomanenkoYM@ipgg.sbras.ruИнститут нефтегазовой геологии и геофизики им. А.А. Трофимука СО РАН; Новосибирский государственный университетРоссияA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RAS; Novosibirsk State UniversityRussian FederationИнститут нефтегазовой геологии и геофизики им. А.А. Трофимука СО РАНРоссияA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RASRussian Federation20172709201783655671Copyright © Дядьков П.Г., Кучай О.А., Романенко Ю.М., 20172017Дядьков П.Г., Кучай О.А., Романенко Ю.М.Dyadkov P.G., Kuchay O.A., Romanenko Y.M.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/384

На основе данных о механизмах очагов землетрясений выполнен расчет сейсмотектонических деформаций для района землетрясения Мауле, Мw=8.8, 2010 г. Детально исследованы особенности деформаций на разных глубинах. В районе основной сейсмодислокации землетрясения Мауле и севернее характер поля деформаций до глубин 70 км является обычным для зон субдукции: наблюдается укорочение в направлении погружения океанической плиты. Ниже глубины 70 км характер деформирования резко меняется на горизонтальное удлинение. После главного события, так же как и до него, в очаговой области преобладает близширотное укорочение, но область основных сейсмодислокаций окружена отдельными участками с противоположным типом деформаций – близширотным удлинением. Детальный анализ сейсмотектонических деформаций в области океанического поднятия к западу от глубоководного желоба позволил выявить локальные участки близширотного удлинения вблизи южной и северной границы будущей области деструкции землетрясения Мауле. Обнаружение таких участков может иметь важное прогностическое значение для заблаговременного выделения областей подготовки сильных субдукционных землетрясений.

Based on the data on earthquake focal mechanisms, we estimated seismotectonic deformation related to the 2010 Мw 8.8 Maule earthquake and analyzed the deformation at different depths. In the main seismic dislocation of the Maule earthquake and the northern area, the deformation field to a depth of 70 km is typical of subduction zones as evidenced by shortening in the direction of the oceanic plate subduction. Below a depth of 70 km, the deformation pattern changes sharply to horizontal stretching. After the main seismic event, as well as before it, nearlatitudinal shortening was dominant in the focal zone, while the region of the main seismic dislocations was surrounded by separate areas of near-latitudinal stretching, which is an opposite type of deformation. We conducted a detailed analysis of the seismotectonic deformations in the oceanic uplift area to the west of the deep-water trough and identified local zones of near-latitudinal stretching near the southern and northern boundaries of the future Maule earthquake zone. Detecting such zones can provide important data for early forecasting of regions wherein strong subduction-related earthquakes are being prepared.

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