Fast rupture propagation for large strike-slip earthquakes
Fast rupture propagation for large strike-slip earthquakes
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大型走滑地震的快速破裂传播
DOI：
10.1016/j.epsl.2016.02.022
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发表时间：
2016-04
影响因子：
5.3
通讯作者：
Koketsu Kazuki
中科院分区：
文献类型：
--
作者：
Wang Dun;Mori Jim;Koketsu Kazuki
研究浅层地震的破裂速度具有广泛的意义，因为它对地震中造成破坏的强近场震动有很大的影响，而且它是反映滑动断层应力水平和能量的重要参数。然而，由于近场观测的局限性以及远震观测中破裂速度与断层大小之间的权衡，标准波形反演方法难以求解破裂速度。本文采用反投影方法估计了日本Hi-net和北美USArray记录的15 M w≥7.8级倾滑地震和8 M w≥7.5级走滑地震的破裂速度。我们发现所有走滑事件的平均破裂速度都非常快，为3.0-5.0 km/s，接近或大于局部横波速度（超横波速度）。这些数值比逆冲和正常断层地震快，后者的破裂速度通常为1.0-3.0公里/秒。
Studying rupture speeds of shallow earthquakes is of broad interest because it has a large effect on the strong near-field shaking that causes damage during earthquakes, and it is an important parameter that reflects stress levels and energy on a slipping fault. However, resolving rupture speed is difficult in standard waveform inversion methods due to limited near-field observations and the tradeoff between rupture speed and fault size for teleseismic observations. Here we applied back-projection methods to estimate the rupture speeds of 15 M w≥ 7.8 dip-slip and 8 M w≥ 7.5 strike-slip earthquakes for which direct P waves are well recorded in Japan on Hi-net, or in North America on USArray. We found that all strike-slip events had very fast average rupture speeds of 3.0–5.0 km/s, which are near or greater than the local shear wave velocity (supershear). These values are faster than for thrust and normal faulting earthquakes that generally rupture with speeds of 1.0–3.0 km/s.
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影响因子：
2.8
作者：
W. Fan;P. Shearer;P. Gerstoft
通讯作者：
W. Fan;P. Shearer;P. Gerstoft
影响因子：
5.2
作者：
Guohong Zhang;M. Vallée;X. Shan;B. Delouis
通讯作者：
Guohong Zhang;M. Vallée;X. Shan;B. Delouis
影响因子：
3
作者：
M. Kikuchi;H. Kanamori
通讯作者：
M. Kikuchi;H. Kanamori
DOI：
10.1002/2013jb010594
发表时间：
2013-11
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
--
作者：
H. Yue;T. Lay;J. Freymueller;K. Ding;L. Rivera;N. Ruppert;K. Koper
通讯作者：
H. Yue;T. Lay;J. Freymueller;K. Ding;L. Rivera;N. Ruppert;K. Koper
影响因子：
56.9
作者：
Bouchon, M;Vallée, M
通讯作者：
Vallée, M