3-D finite element modeling for evolution of stress field and interaction among strong earthquakes in Sichuan-Yuannan region |
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Authors: | Chen Hua-ran Chen Lian-wang Ma Hong-sheng Li Yi-qun Zhang Jie-qing He Qiao-yun and Wang Jian-guo |
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Institution: | (1) Earthquake Administration of Tianjin Municipality, 300201 Tianjin, China;(2) Institute of Crustal Dynamics, China Earthquake Administration, 100085 Beijing, China;(3) Institute of Earthquake Science, China Earthquake Administration, 100036 Beijing, China |
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Abstract: | Based on the latest achievement about activities of geological structure, a 3-D finite-element model containing four layers
of upper crust, lower crust (two layers) and upper mantle is established in the paper. By repeated tests and revisions, the
boundary conditions of the model are determined. And then the background stress field, the stress field caused by fault creep
and the stress field triggered by strong earthquake in Sichuan-Yunnan region, as well as their dynamic variations are calculated.
The results indicate that the latter earthquake often occurs in the area with positive Coulomb rupture stress change associated
with the former one, the former earthquake has a triggering effect on the latter one to a certain extent, and strong earthquake
often occur in groups under the background of high stress, which is of great significance for distinguishing seismic anomalies,
as well as for improving the level of earthquake prediction.
Foundation item: State Key Basic Research Project (G1998040702) and Key Project of State Science and Technology during the tenth Five-year
Plan (2001BA601B02-01-03). |
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Keywords: | 3-D finite element model background stress field stress field caused by fault creep stress field triggered by strong earthquake |
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