P-wave velocity structure in the southernmost source region of the 2011 Tohoku earthquakes, off the Boso Peninsula, deduced by an ocean bottom seismographic survey

P-wave velocity structure in the southernmost source region of the 2011 Tohoku earthquakes, off the Boso Peninsula, deduced by an ocean bottom seismographic survey
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2011 年东北地震震源区最南端(房总半岛附近)的 P 波速度结构,由海底地震测量推断

DOI:
10.5047/eps.2012.06.006
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发表时间:
2012
期刊:
Earth, Planets and Space
影响因子:
--
通讯作者:
T. Kanazawa
T. Kanazawa
中科院分区:
--
文献类型:
--
作者:
K. Nakahigashi;M. Shinohara;K. Mochizuki;Tomoaki Yamada;R. Hino;Toshinori Sato;K. Uehira;Y. Ito;Y. Murai;T. Kanazawa

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我们介绍了在茨城县和房总半岛附近地区使用海底地震仪和受控震源进行的地震实验的结果。该地区是2011年东北地震太平洋沿岸破裂带的南缘。我们使用二维射线追踪方法估计了剖面下方的 P 波地震速度结构。南部地区的地壳结构较北部地区更加不均匀。这种异质性被认为与菲律宾海板块(PHS)俯冲有关。向陆板块和太平洋板块之间的板块边界(PAC)位于深度20公里处,距离剖面南端170公里。俯冲 PHS 图像显示在剖面的南部。然而,我们无法获得 PHS 和 PAC 接触区的清晰图像。据估计,PHS 和 PAC 的接触区域由于两块板的碰撞而产生强烈变形,因此具有很大的不均匀性。我们推断,破裂的终止和碰撞区域的大后滑就是由这种强烈的非均质性引起的。
We present the result of a seismic experiment conducted using ocean bottom seismometers and controlled sources in the region off Ibaraki and the Boso Peninsula. This region is the southern edge of the rupture zone of the 2011 off the Pacific coast of Tohoku Earthquake. We estimated the P-wave seismic velocity structure beneath the profile using a 2-D ray-tracing method. The crustal structure in the southern area is more heterogeneous than that of the northern area. This heterogeneity is thought to be related with subducting the Philippine Sea plate (PHS). The plate boundary between the landward plate and the Pacific plate (PAC) is positioned at depths of 20 km at a distance of 170 km from the southern end of the profile. The subducting PHS is imaged on the southern part of the profile. However, we could not obtain a distinct image of the contact zone of PHS and PAC. The contact zone of PHS and PAC is estimated to have a large heterogeneity resulting from strong deformation due to the collision of the two plates. We infer that the termination of the rupture, and the large afterslip in the collision region, are caused by this strong heterogeneity.
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