A large slow slip event and the depth of the seismogenic zone in the south central Alaska subduction zone
A large slow slip event and the depth of the seismogenic zone in the south central Alaska subduction zone
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DOI：
10.1016/j.epsl.2006.05.013
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发表时间：
2006-07-15
影响因子：
5.3
通讯作者：
Suito, Hisashi
中科院分区：
文献类型：
--
作者：
Ohta, Yusaku;Freymueller, Jeffrey T.;Suito, Hisashi
我们模拟地壳变形之前，期间和之后的缓慢滑动事件（SSE）在阿拉斯加南部的板块界面。将GPS时间序列分为1998年前、1998 - 2001年和2001 - 2002年三个时段，第一、末时段代表稳定形变，中间时段代表SSE。我们发现了一个类似于100%的滑动赤字在浅部的孕震区，深度为25 - 30公里，我们确定与1964年地震中破裂的主要凹凸。上证所出现下倾的粗糙，在一个部分，积累了一些滑动赤字在稳定的时间段。于上证所期间，超过20，000平方呎。km的板块界面滑动> 10 cm，累积矩震级为M-w = 7.2。在1964年的地震中，与主要粗糙体的滑动相比，SSE的区域没有显著的滑动。我们建议，在地震之间，这个区域在SSE中反复失败，并且与它的主要粗糙体上倾相比，保持相对较低的剪切应力。（c）2006年Elsevier B.V.保留所有权利。
We modeled crustal deformation before, during and after a slow slip event (SSE) on the plate interface in southern Alaska. We divided the GPS time series into three time periods: before 1998, 1998 to 200 1, and 2001-2002; the first and last periods represent the steady deformation, while the middle period represents the SSE. We found a stationary zone of similar to 100% slip-deficit in the shallow part of the seismogenic zone, to depths of 25-30 km, which we identify with the main asperity that ruptured in 1964 earthquake. The SSE occurs downdip of the asperity, on a section that accumulated some slip deficit during the steady time periods. During the SSE, > 20,000 sq. km of the plate interface slipped > 10 cm, for a cumulative moment magnitude of M-w=7.2. The area of the SSE did not have a significant slip in the 1964 earthquake, compared to the slip of the main asperity. We propose that between earthquakes this zone fails repeatedly in SSEs and remains at relatively low shear stress compared to the main asperity up-dip of it. (c) 2006 Elsevier B.V. All rights reserved.