Slip rate deficit and earthquake potential on shallow megathrusts
Slip rate deficit and earthquake potential on shallow megathrusts
复制标题
浅层巨型逆冲断层的滑移率赤字和地震潜力
DOI：
10.1038/s41561-021-00736-x
复制
发表时间：
2021
影响因子：
18.3
通讯作者：
Lindsey E
中科院分区：
文献类型：
--
作者：
Lindsey E
大多数破坏性的海啸是由近海巨型逆冲断层浅部的地震滑动引起的。这种行为的可能性部分取决于地震间滑动速率的不足，根据对浅层断层材料的摩擦研究，通常认为这种不足很低。在这里，我们提出了一种新的方法来推断滑移率赤字的大地测量数据，占的应力阴影投下的hallocked补丁，并表明，这种方法大大提高了我们的离岸分辨率。我们将这种技术应用于卡斯卡迪亚和日本海沟的巨型逆冲断层，并发现，无论锁定补丁的存在，浅断层一般有一个滑动率赤字之间的80和100%的板块收敛率，无论其摩擦性能。这一发现排除了以前的研究所考虑的海沟低动力学耦合的区域。如果这些浅层断层的区域可以发生地震滑动，全球海啸的危险可能比目前认识到的更高。我们的方法确定了关键位置，海底观测可以产生有关这些断层摩擦特性的信息，以便更好地了解它们的滑动行为。
Most destructive tsunamis are caused by seismic slip on the shallow part of offshore megathrusts. The likelihood of this behaviour is partly determined by the interseismic slip rate deficit, which is often assumed to be low based on frictional studies of shallow fault material. Here, we present a new method for inferring the slip rate deficit from geodetic data that accounts for the stress shadow cast by frictionally locked patches, and show that this approach greatly improves our offshore resolution. We apply this technique to the Cascadia and Japan Trench megathrusts and find that, wherever locked patches are present, the shallow fault generally has a slip rate deficit between 80 and 100% of the plate convergence rate, irrespective of its frictional properties. This finding rules out areas of low kinematic coupling at the trench considered by previous studies. If these areas of the shallow fault can slip seismically, the global tsunami hazard could be higher than currently recognized. Our method identifies critical locations where seafloor observations could yield information about frictional properties of these faults so as to better understand their slip behaviour.
登录
查看更多内容
影响因子：
3.5
作者：
Wessel, P.;Luis, J. F.;Tian, D.
通讯作者：
Tian, D.
影响因子：
--
作者：
C. Scholz;J. Campos
通讯作者：
C. Scholz;J. Campos
影响因子：
--
作者：
R. Kanda;M. Simons
通讯作者：
M. Simons
影响因子：
3.9
作者：
Herman, Matthew W.;Furlong, Kevin P.;Govers, Rob
通讯作者：
Govers, Rob
影响因子：
2
作者：
Metois, M.;Vigny, C.;Socquet, A.
通讯作者：
Socquet, A.