Rupture history of the 2013 Mw 6.6 Lushan earthquake constrained with local strong motion and teleseismic body and surface waves
Rupture history of the 2013 Mw 6.6 Lushan earthquake constrained with local strong motion and teleseismic body and surface waves
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2013年芦山6.6级地震受局地强震及远震体和面波约束的破裂历史
DOI：
10.1002/2013gl056876
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发表时间：
2013-10-28
影响因子：
5.2
通讯作者：
Yao, Zhenxing
中科院分区：
文献类型：
--
作者：
Hao, Jinlai;Ji, Chen;Yao, Zhenxing
2013年4月20日芦山M-w 6.6地震的破裂历史受到局地强震、远震宽频体波和长周期面波反相波形的约束。本次地震破裂了一条向北东N210度（沿龙门山断裂带）、北西倾40度的逆冲断裂带。逆滑分布不均匀，以一个大致为直角三角形的滑动块为主，其深度范围为5-20 km，占总地震矩（8.9 x 10(18) N m）的三分之二。破裂大致始于三角斜边的中间，在最初的4秒内，主要沿走向和下倾方向传播，峰值滑移量为1.2 m。虽然造成了大量人员伤亡和经济损失，但芦山地震的静应力降和视应力降分别为1.5 MPa和0.35 MPa，相对于其他类似的板内地震来说是相当低的。
The rupture history of the 20 April 2013 M-w 6.6 Lushan (China) earthquake is constrained by inverting waveforms of local strong motion, teleseismic broadband body waves, and long-period surface waves. This earthquake ruptured a blind thrust fault oriented N210 degrees E (along the Longmenshan fault zone) and dipping 40 degrees to the NW. The inverted slip distribution is heterogeneous, dominated by a slip patch with a roughly right triangular shape, which spans a depth range of 5-20 km and accounts for two thirds of the total seismic moment (8.9 x 10(18) N m). The rupture initiated roughly at the middle of the triangle's hypotenuse and, during the first 4 s, propagated mainly in along-strike and downdip directions, toward a peak slip of 1.2 m. Despite a large number of fatalities and economic loss, the estimated static and apparent stress drops of the Lushan earthquake are 1.5 MPa and 0.35 MPa, considerably low with respect to other similar intraplate earthquakes.