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The state of stress in the Earth's crust along the northwestern flank of the Pacific seismic focal zone before the Tohoku earthquake of 11 March 2011статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 3 декабря 2017 г.
- Авторы: Rebetsky Yu L., Polets A.Yu, Zlobin T.K.
- Журнал: Tectonophysics
- Том: 685
- Год издания: 2016
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 60
- Последняя страница: 76
- DOI: 10.1016/j.tecto.2016.07.016
- Аннотация: This paper presents a detailed reconstruction of the state of stress in the earth's crust in the Japanese seismic focal zone before the Tohoku earthquake of March 11, 2011. The reconstruction of the state of stress is based on earthquake focal mechanism data for two magnitude ranges, : 1) 3.0-5.5 and 2) 5.0-7.0. The calculations for the first data set are performed at six depths. A large amount of data on the focal mechanisms of earthquakes with magnitudes between 3.0 and 5.5 has allowed us to obtain new data on changes in the stress field, which were missed in the previous calculation for the second data set. It is shown that in the upper part of the lithosphere (up to 90 km) the axis of maximum compression is generally oriented slightly (25-35°) under the oceanic plate west of the Japan Trench, and it dips subvertically east of the trench. The upper part of the tectonosphere is divided into two geodynamic regimes: subhorizontal compression west of the trench axis and subhorizontal extension east of the trench axis. West of the Japan Trench, the axis of maximum horizontal compression is orthogonal to the trench axis, but east of the Japan Trench, its orientation has changed (~90°). The underthrusting shear stress that acts normal to the horizontal planes has a similar west and west-southwest direction in the upper layers (0-50 km). Deviations in the orientation are observed at depths between 70 and 90 km at the junction between the Japan Trench and the Nankai Trough and in the crust of the northeastern part of the Tohoku region. Obtained results are summarized in 2 D-pattern, which can be used to explain the loading mechanism in the region of the Tohoku earthquake.
- Добавил в систему: Ребецкий Юрий Леонидович