Remotely-triggered seismicity in the Hakone volcano following the 2011 off the Pacific coast of Tohoku Earthquake
Remotely-triggered seismicity in the Hakone volcano following the 2011 off the Pacific coast of Tohoku Earthquake
复制标题
2011 年东北太平洋沿岸地震后箱根火山远程触发的地震活动
DOI：
10.5047/eps.2011.05.004
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
A. Yoshida
中科院分区：
文献类型：
--
作者：
Y. Yukutake;R. Honda;M. Harada;T. Aketagawa;Hiroshi Itô;A. Yoshida
在2011年东北太平洋沿岸地震之后，震中距离为450公里的箱根火山的地震活动显着活跃。从3月11日15：00到4月2日12：00，在火山的破火山口观察到1600多起事件。为了弄清箱根火山主震发生和诱发活动之间的关系，我们调查了震源的空间分布和地震活动的时间变化，我们检查了主震的地震仪，以确定在表面波通过期间的小的局部事件。用双差法确定的震源多呈南北向分布，表现出多个地震活动簇。大地震的震源机制主要是走滑，其P轴为NNW-SSE方向。震源分布和震源机制的这些特征与箱根火山通常发生的地震一致。当地事件的发病期间启动的爱和瑞利波从主震，这表明，大的动态应力变化的0.6 MPa占主导地位的地震活动序列的启动。
Seismic activity in the Hakone volcano at an epicentral distance of 450 km was remarkably activated just after the 2011 off the Pacific coast of Tohoku Earthquake. More than 1600 events were observed in the caldera of the volcano, from 15:00 on March 11 to 12:00 on April 2. To clarify the relationship between the occurrence of the main shock and the induced activity in the Hakone volcano, we investigated the spatial distribution of hypocenters and temporal changes of the seismicity, and we examined seismographs of the main shock to identify small local events during the passage of the surface waves. Hypocenters determined with the double-difference method are mostly distributed in the N-S direction, showing several clusters of seismicity. Focal mechanisms of major earthquakes are predominantly strike-slip having the P axis in the NNW-SSE direction. These features of the hypocenter distribution and the focal mechanisms are consistent with those of earthquakes that occur ordinarily in the Hakone volcano. The onset of the local event was initiated during the Love and Rayleigh waves from the main shock, suggesting that large dynamic stress changes of 0.6 MPa dominantly contributed to initiate the sequence of seismic activity.
影响因子：
3
作者：
Y. Okada
通讯作者：
Y. Okada