Transfer of stress from the 2004Mw9.2 Sumatra subduction earthquake promoted widespread seismicity and large strike-slip events in the Wharton Basin

Guo Laiyin; Lin Jian; Zhang Fan; Zhou Zhiyuan

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Transfer of stress from the 2004Mw9.2 Sumatra subduction earthquake promoted widespread seismicity and large strike-slip events in the Wharton Basin

机译：从2004MW9.2的压力转移苏门答腊郊区地震促进了沃顿盆地的广泛地震性和大型罢工事件

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The 2004Mw9.2 Sumatra and 2012Mw8.6 Wharton Basin (WB) earthquakes provide the unprecedented opportunity to investigate stress transfer from a megathrust earthquake to the subducting plate. Comprehensive analyses of this study revealed that the 2004 earthquake excited widespread seismicity in the WB, especially in regions of calculated stress increase greater than 0.3 bars. The 2004 earthquake stressed all three rupture planes of the 2012Mw8.6 strike-slip mainshock and the largestMw8.2 aftershock with mean values of Coulomb stress between 0.3 and 2.1 bars. For the 77Mw >= 4 regional events since 2012, at least one nodal plane for 95% of the events, and both nodal planes for 72% of the events experienced stress increase due to the 2004 earthquake. Results of the analyses also revealed that the regional stress directions in the WB may have controlled the sub-fault orientations of the 2012Mw8.6 strike-slip earthquake.

机译：2004Mw9。2苏门答腊岛和2012Mw8。6沃顿盆地（WB）地震提供了前所未有的机会来研究从大推力地震到俯冲板块的应力转移。对这项研究的综合分析表明，2004年的地震激发了世界银行的广泛地震活动，特别是在计算应力增加大于0.3巴的地区。2004年的地震使2012Mw8的三个破裂面都受到了应力。6走滑主震和最大的MW8。2次余震，库仑应力平均值在0.3至2.1巴之间。自2012年以来，77Mw>=4个区域性事件中，95%的事件至少有一个节面，72%的事件的两个节面都因2004年的地震而经历了应力增加。分析结果还表明，WB中的区域应力方向可能控制了2012Mw8的次级断层方向。6.走滑地震。

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《Terra Nova》 |2021年第1期|共12页
作者
Guo Laiyin; Lin Jian; Zhang Fan; Zhou Zhiyuan;
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作者单位

Tongji Univ Sch Ocean &

Earth Sci Shanghai Peoples R China;

Chinese Acad Sci Innovat Acad South China Sea Ecol &

Environm Engn South China Sea Inst Oceanol Key Lab Ocean &

Marginal Sea Geol Guangzhou Peoples R China;

Chinese Acad Sci Innovat Acad South China Sea Ecol &

Environm Engn South China Sea Inst Oceanol Key Lab Ocean &

Marginal Sea Geol Guangzhou Peoples R China;

Chinese Acad Sci Innovat Acad South China Sea Ecol &

Environm Engn South China Sea Inst Oceanol Key Lab Ocean &

Marginal Sea Geol Guangzhou Peoples R China;

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正文语种 eng
中图分类天文学、地球科学;
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Transfer of stress from the 2004Mw9.2 Sumatra subduction earthquake promoted widespread seismicity and large strike-slip events in the Wharton Basin

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