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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Slip distribution of the 2003 Tokachi-oki M_w, 8.1 earthquake from joint inversion of tsunami waveforms and geodetic data
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Slip distribution of the 2003 Tokachi-oki M_w, 8.1 earthquake from joint inversion of tsunami waveforms and geodetic data

机译：海啸波形和大地测量数据联合反演的2003年十胜冈M_w级地震的滑动分布

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摘要

We study the 2003 M_w 8.1 Tokachi-oki earthquake, a great interplate event that occurred along the southwestern Kuril Trench and generated a significant tsunami. To determine the earthquake slip distribution, we perform the first joint inversion of tsunami waveforms measured by tide gauges and of coseismic displacement measured both by GPS stations and three ocean bottom pressure gauges (PG) for this event. The resolution of the different data sets on the slip distribution is assessed by means of several checkerboard tests. Results show that tsunami data constrain the slip distribution offshore, whereas GPS data constrain the slip distribution in the onshore zone. The three PG data only coarsely constrain the offshore slip, indicating that denser networks should be installed close to subduction zones. Combining the three data sets significantly improves the inversion results. Joint inversion of the 2003 Tokachi-oki earthquake data leads to maximum slip values (-6 m) confined at depths greater than ~25 km, between 30 and 80 km northwest of the hypocenter, with a patch of slip (3 m) in the deepest part of the source (~50 km depth). Slip values are very low (<1 m) updip from the hypocenter. Furthermore, the rupture does not extend on the plate interface off Akkeshi. As a significant back slip amount (-4 m) has accumulated there since the last 1952 earthquake, this segment could rupture during the next large interplate event along the Kuril Trench.
机译：我们研究了2003年十月冈山8.1级地震，这是一次大型的板间事件，发生在西南千岛海沟，并引发了严重的海啸。为了确定地震滑动分布，我们针对该事件执行了由潮汐计测量的海啸波形与GPS站和三个海底压力计（PG）共同测量的同震位移的首次联合反演。通过数个棋盘测试评估滑移分布上不同数据集的分辨率。结果表明，海啸数据限制了近海的滑动分布，而GPS数据限制了近海区域的滑动分布。这三个PG数据仅粗略地限制了海上滑坡，表明应在俯冲带附近安装更密集的网络。将这三个数据集组合在一起可以显着改善反演结果。 2003年十胜井地震数据的联合反演导致最大滑移值（-6 m）限制在震源西北30至80 km之间大于25 km的深度处，而在滑坡中有3 m的滑移源的最深部分（约50 km深度）。滑移值距震源上移的高度很低（<1 m）。此外，破裂不会在Akkeshi附近的板界面上延伸。自从1952年上一次地震以来，那里已经积累了大量的后滑量（-4 m），因此该段可能会在沿千岛海沟的下一次大型板间活动中破裂。

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