Modeling the rupture process of the 2003 September 25 Tokachi-Oki (Hokkaido) earthquake using 1-Hz GPS data
Modeling the rupture process of the 2003 September 25 Tokachi-Oki (Hokkaido) earthquake using 1-Hz GPS data
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DOI：
10.1029/2004gl021457
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发表时间：
2004-11-03
影响因子：
5.2
通讯作者：
Yamagiwa, A
中科院分区：
文献类型：
--
作者：
Miyazaki, S;Larson, KM;Yamagiwa, A
[ 1]高速率GPS具有精确恢复动态和静态位移的潜力。我们分析了2003年十胜冲地震期间记录的1 Hz GPS数据。1-Hz的GPS位移波形显示出良好的协议与综合加速度计记录，除了低频噪声是固有的综合地震记录。GPS波形被反演，以模拟破裂期间断层滑动的时空演化。发现滑动在俯冲带中下倾传播，最大力矩释放距离震中西北-50公里。最大的滑动区域一般同意与传统的地震研究，表明1-Hz的GPS可用于有限的故障研究。1-Hz GPS滑动模型显示出更清晰的对比与余震分布比那些推断从强震数据，可能是因为1-Hz GPS是更敏感的累积滑动分布。
[ 1] High-rate GPS has the potential to recover both dynamic and static displacements accurately. We analyze 1-Hz GPS data recorded during the 2003 Tokachi-Oki earthquake. The 1-Hz GPS displacement waveforms show good agreement with integrated accelerometer records except for low frequency noise that are inherently present in integrated seismic records. The GPS waveforms were inverted to model the spatio-temporal evolution of the fault slip during the rupture. The slip is found to propagate downdip in the subduction zone with largest moment release -50 km northwest of the hypocenter. The region of largest slip agrees in general with traditional seismic studies, indicating that 1-Hz GPS can be used for finite fault studies. The 1-Hz GPS slip model shows clearer contrast with afterslip distributions than those inferred from strong motion data, possibly because 1-Hz GPS is more sensitive to cumulative slip distribution.