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タイトル: | Three-dimensional numerical modelling of earthquake migration along a northwestern Pacific subducting slab |
著者: | Loo, H. Y. Gao, X. L. Sun, J. X. Mikumo, T. Hirahara, K. Yoshioka, S. |
発行日: | 7-Feb-1992 |
出版者: | American Geophysical Union |
誌名: | Geophysical Research Letters |
巻: | 19 |
号: | 3 |
開始ページ: | 313 |
終了ページ: | 316 |
抄録: | Three-dimensional numerical modeling has been performed to account for possible earthquake migration phenomena along a northwestern Pacific subduction slab, on the assumption that the lithosphere is a linear visco-elastic body, but the asthenosphere and the mesosphere respond to the applied stress as non-linear Newtonian materials obeying the power law of creep. On the basis of a three-dimensional thermal structure of the northwestern Pacific region, the preliminarily computed stress regimes show that: 1) to induce a stick-slip type trench event, prefailures at a depth of about 40 km in the front of the locked zone between two lithospheric plates are required; 2) the compositional density contrast due to phase change at typical depths is prerequisite of stress concentration to cause a dislocation type deep-focus earthquake; and 3) the co-seismic change in gravitational potential is a controlling factor for earthquake migration downward along the subduction slab. |
著作権等: | Copyright 1992 by the American Geophysical Union. |
URI: | http://hdl.handle.net/2433/193398 |
DOI(出版社版): | 10.1029/92GL00021 |
出現コレクション: | 三雲 健 |
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