Interseismic coupling, stress evolution, and earthquake slip on the Sunda megathrust
Interseismic coupling, stress evolution, and earthquake slip on the Sunda megathrust
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DOI：
10.1002/grl.50776
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发表时间：
2013-08
影响因子：
5.2
通讯作者：
S. Nalbant;J. McCloskey;S. Steacy;M. Nicbhloscaidh;S. Murphy
中科院分区：
文献类型：
--
作者：
S. Nalbant;J. McCloskey;S. Steacy;M. Nicbhloscaidh;S. Murphy
地震间耦合对大型逆冲断层地震滑动分布的控制程度尚不清楚，一些作者认为它是主要的控制因素，而另一些作者则认为以前地震的应力变化具有一级重要性。在这里，我们开发了一个详细的应力历史的巽他巨型逆冲断层，修改耦合，并比较滑动和应力之间的相关性与滑动与耦合。我们发现，最近的地震的滑移分布与应力场的耦合分布更一致，但观察到，在某些地方，应力模式强烈依赖于历史地震中的滑移约束差的值。我们还发现，在我们研究中有震源位置的13次地震中，只有两次似乎在负应力区域成核，这些位置对应于仪器前事件滑动分布的很大不确定性。
The extent to which interseismic coupling controls the slip distribution of large megathrust earthquakes is unclear, with some authors proposing that it is the primary control and others suggesting that stress changes from previous earthquakes are of first‐order importance. Here, we develop a detailed stress history of the Sunda megathrust, modified by coupling, and compare the correlation between slip and stress with that of slip versus coupling. We find that the slip distributions of recent earthquakes are more consistent with the stress field than with the coupling distributions but observe that in places, the stress pattern is strongly dependent on poorly constrained values of slip in historical earthquakes. We also find that of the 13 earthquakes in our study for which we have hypocentral locations, only two appear to have nucleated in areas of negative stress, and these locations correspond to large uncertainties in the slip distribution of pre‐instrumental events.