The 2003 M8.0 Tokachi-Oki earthquake - How much has the great event paid back slip debts?
The 2003 M8.0 Tokachi-Oki earthquake - How much has the great event paid back slip debts?
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DOI：
10.1029/2003gl019021
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发表时间：
2004-03-11
影响因子：
5.2
通讯作者：
Nishimura, T
中科院分区：
文献类型：
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作者：
Miura, S;Suwa, Y;Nishimura, T
2003年9月26日，北海道以南的板块边界发生了M8.0级大地震（2003年十胜冲地震），震中与1952年M8.2十胜冲地震的震中大致相同。我们使用GPS数据估计了同震滑移分布，以获得与波形反演推断一致的结果；距震中北北东约 30 公里处存在大于 5 m 的最大滑移。虽然我们最近的研究估计的滑移赤字（80毫米/年）是基于相当短的观测周期（5年）来讨论整个地震周期，但假设回滑速率自1952年以来几乎恒定，最大同震滑移大致占了过去51年累积的滑移赤字。然而，除了最大滑移的区域之外，累积的滑移赤字仍然存在，应该通过地震来释放 或地震滑移，现在实际上部分地观察到震后滑移。
A great earthquake with M8.0 (the 2003 Tokachi-Oki earthquake) occurred on September 26, 2003, on the plate boundary south of Hokkaido, at about the same epicenter as that of the 1952 M8.2 Tokachi-Oki earthquake. We estimated the coseismic slip-distribution using GPS data to obtain consistent results with that inferred from waveform inversions; a maximum slip larger than 5m exists around 30km NNE from the epicenter. Though the slip-deficit estimated there (80 mm/yr) by our recent study is based on a rather short period of observation (5 years) to discuss the whole seismic cycle, the maximum coseismic slip roughly accounts for the slip-deficit accumulated in the past 51 years, assuming that the back-slip rate has been nearly constant since 1952. Besides the area of the largest slip, however, an accumulated slip-deficit still remains and should be released by seismic or aseismic slip, which is now actually observed in part as postseismic slip.