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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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