The 2005 M7.2 MIYAGI-OKI earthquake, NE Japan: Possible rerupturing of one of asperities that caused the previous M7.4 earthquake
The 2005 M7.2 MIYAGI-OKI earthquake, NE Japan: Possible rerupturing of one of asperities that caused the previous M7.4 earthquake
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DOI：
10.1029/2005gl024613
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发表时间：
2005-12-17
影响因子：
5.2
通讯作者：
Hasegawa, A
中科院分区：
文献类型：
--
作者：
Okada, T;Yaginuma, T;Hasegawa, A
2005年8月16日，日本东北部宫城隐木地区发生了M7.2级板间大地震，该地区曾多次发生7.5级左右的大板间地震，其复发间隔约为37年。我们使用双差震源位置比较了 2005 年宫城冲地震和之前的 1978 年宫城冲地震（M7.4）的余震分布。 2005 年宫城冲地震的余震区与 1978 年地震的南部/东南部部分重叠。 2005 年事件的余震群位置与 1978 年事件的位置以及背景地震活动的位置相对应。通过地震波形反演估算的2005年事件的同震滑移区也与1978年事件的同震滑移区有部分重叠。这些观测结果表明，俯冲带板块边界上的空间地震活动模式仍然存在，2005 年的事件可能使 1978 年事件的部分震源区破裂。
A large (M7.2) interplate earthquake occurred on 16 August 2005 in the Miyagi-Oki region, where large interplate earthquakes with magnitude of similar to 7.5 have occurred repeatedly at a recurrence interval of similar to 37 yrs, NE Japan. We compared aftershock distribution of the 2005 Miyagi-Oki earthquake with that of the previous 1978 Miyagi-Oki earthquake (M7.4) using double-difference hypocenter locations. The aftershock area of the 2005 Miyagi-Oki earthquake is partly overlapped with the southern/southeastern part of that of the 1978 event. Locations of aftershock clusters of the 2005 event correspond with those of the 1978 event and those of the background seismicity. Coseismic slip area of the 2005 event estimated by seismic waveform inversion is also partly overlapped with that of the 1978 event. These observations suggest that spatial seismicity pattern on the plate boundary in subduction zone persists and the 2005 event possibly ruptured a part of the source area of the 1978 event.