The M7.1 May 26, 2003 off-shore Miyagi Prefecture Earthquake in northeast Japan: Source process and aftershock distribution of an intra-slab event
The M7.1 May 26, 2003 off-shore Miyagi Prefecture Earthquake in northeast Japan: Source process and aftershock distribution of an intra-slab event
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2003年5月26日日本东北部宫城县近海M7.1地震：板内事件的震源过程和余震分布
DOI：
10.1186/bf03352482
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
A. Hasegawa
中科院分区：
文献类型：
--
作者：
T. Okada;A. Hasegawa
2003年5月26日，日本东北部宫城县近海68 km处发生了一次7.1级板内地震。这次地震的震中位于1978年近海宫城7.4级地震震中东北偏北约80公里处，该地震可能在不久的将来再次发生，令人担忧。利用均匀台站法对2003年7. 1级地震及其余震进行了重新定位。余震分布沿着一个陡倾于西北偏西的平面，该平面与矩张量解的节面之一重合。它们分布在俯冲洋壳和板片地幔中。主震位于余震区中心附近，可能发生在洋壳底部附近。利用基于经验绿色函数的波形反演方法，确定了2003年M7.1地震的滑动分布。我们对震中距离小于约100公里的台站观测到的宽带波形数据进行了反演。结果表明，破裂区与余震区的空间范围基本一致。存在两个发生大量滑移的区域（凹凸体）。一个位于破裂区的东北边缘沿着，另一个位于西南部。在这些凹凸不平的地方余震活动很低。
A M7.1 intra-slab earthquake occurred on May 26, 2003 at a depth of 68 km off-shore Miyagi Prefecture, northeastern Japan. The epicenter of this event was located about 80 km NNE from the epicenter of the 1978 offshore Miyagi earthquake with magnitude of 7.4, whose possible recurrence in near future is a source of concern. We relocated the 2003 M7.1 event and its aftershocks by the homogeneous station method. Aftershocks are distributed along a plane dipping steeply to the WNW, which coincides with one of the nodal planes of the moment tensor solution. They are distributed within both the subducting oceanic crust and the mantle of the slab. The mainshock is located near the center of the aftershock zone and probably occurred near the bottom of the oceanic crust. We also determined the slip distribution of the 2003 M7.1 event by a waveform inversion method based on the empirical Green’s function. We inverted broad-band waveform data observed at stations with epicentral distance less than about 100 km. Results show that the spatial extent of the rupture area is almost consistent with that of the aftershock area. There exist two areas where large amount of slip occurred (asperities). One is located along the northeastern edge of the rupture area and the other is located in the southwestern portion. Aftershock activity is low within those asperities.
影响因子：
3
作者：
J. Mori;S. Hartzell
通讯作者：
J. Mori;S. Hartzell
日本东北部双地震带下平面M6.4中深度地震震源过程
DOI：
--
发表时间：
2004
期刊：
Journal of Seismology 8
影响因子：
--
作者：
Okada;T.;Umino;N.;Hasegawa;A.
通讯作者：
A.