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:
影响因子:
--
通讯作者:
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
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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影响因子:
2.9
作者:
T. Iwasaki;T. Yoshii;T. Ito;Hiroshi P. Sato;N. Hirata
通讯作者:
T. Iwasaki;T. Yoshii;T. Ito;Hiroshi P. Sato;N. Hirata
影响因子:
2.9
作者:
T. Iwasaki;K. Adachi;T. Moriya;H. Miyamachi;T. Matsushima;K. Miyashita;T. Takeda;T. Taira;Tomoaki Yamada;K. Ohtake
通讯作者:
T. Iwasaki;K. Adachi;T. Moriya;H. Miyamachi;T. Matsushima;K. Miyashita;T. Takeda;T. Taira;Tomoaki Yamada;K. Ohtake
影响因子:
56.9
作者:
Mochizuki, Kimihiro;Yamada, Tomoaki;Kanazawa, Toshihiko
通讯作者:
Kanazawa, Toshihiko
DOI:
--
发表时间:
2009
期刊:
Zishin 2, 61
影响因子:
--
作者:
Kanazawa;T.
通讯作者:
T.
影响因子:
2.8
作者:
ZELT, CA;SMITH, RB
通讯作者:
SMITH, RB