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首页> 外文期刊>Geophysical Research Letters >Rapid estimation of first-order rupture characteristics for large earthquakes using surface waves: 2004 Sumatra-Andaman earthquake
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Rapid estimation of first-order rupture characteristics for large earthquakes using surface waves: 2004 Sumatra-Andaman earthquake

机译:使用表面波快速估计大地震的一阶破裂特征:2004年苏门答腊-安达曼地震

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摘要

Broadband surface waves from large earthquakes can be rapidly processed to estimate seismic moment, faulting duration, and general slip distribution, supplying important information for hazard response efforts, including tsunami warnings. Deconvolution of surface-wave Green's functions removes propagation effects, yielding azimuthally varying effective source time functions. Even a single fault-perpendicular time function can provide robust first-order estimates of the temporal history of seismic radiation and associated slip distribution. Simplified two-dimensional finite-fault modeling using a few surface-wave time functions can reliably characterize the smooth component of the overall rupture process. These procedures are demonstrated using 13 Rayleigh wave observations for the 26 December 2004 Sumatra-Andaman earthquake, yielding satisfactory agreement with models based on more complete seismic data sets. Depending on source and station locations, stable slip estimates can be obtained within 15-60 minutes of the onset of a large earthquake.
机译:可以快速处理来自大地震的宽带表面波,以估计地震矩,断层持续时间和总体滑动分布,从而为灾害响应工作(包括海啸预警)提供重要信息。表面波格林函数的反卷积消除了传播效应,从而产生了沿方位角变化的有效源时间函数。甚至单个断层垂直时间函数也可以提供地震辐射和相关滑动分布的时间历程的可靠的一阶估计。使用一些表面波时间函数的简化二维有限故障建模可以可靠地表征整个破裂过程的平稳分量。这些程序通过2004年12月26日苏门答腊-安达曼地震的13次瑞利波观测得到证明,与基于更完整地震数据集的模型产生了令人满意的一致性。根据震源和测站的位置,可以在大地震发生后的15-60分钟内获得稳定的滑动估计。

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