Seismicity in the incoming/subducting Philippine Sea plate off the Kii Peninsula, central Nankai trough
Seismicity in the incoming/subducting Philippine Sea plate off the Kii Peninsula, central Nankai trough
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南海海槽中部纪伊半岛附近传入/俯冲的菲律宾海板块的地震活动
DOI：
10.1029/2004jb003487
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发表时间：
2005
影响因子：
--
通讯作者：
Y. Kaneda
中科院分区：
文献类型：
--
作者：
K. Obana;S. Kodaira;Y. Kaneda
[1] 沿着日本西南部的南海海槽，菲律宾海板块（PHS）正在俯冲到欧亚板块之下，并且多次发生大型板间地震。最近一次发生在纪伊半岛南海海槽中部的大逆冲地震是 1944 年东南海地震（Mw = 8.2）。尽管2001年11月至2002年2月的海底地震仪（OBS）实验显示1944年东南海地震破裂区周围存在地震活动，但震源位置存在很大的不确定性，特别是深度方面。我们进行了另一项OBS实验，以获得地震的准确位置及其震源机制。新结果显示地震群位于洋壳内的槽轴处。这些集群位于切割洋壳的断层附近，因此地震可能是沿着传入的 PHS 中预先存在的断层发生的。俯冲 PHS 中的地震活动的特点是 1944 年东南海地震同震破裂区的洋壳中的地震静止。洋壳地震活动的变化可以通过传入的俯冲 PHS 中的应力变化来解释。 PHS 洋壳中的应力从由 PHS 弯曲引起的槽轴处的槽法向张力变化为纪伊半岛下方的下倾压缩。俯冲带的地震活动可能与传入板块和俯冲板块中的应力平衡以及俯冲板块和上覆板块之间的耦合有关。
[1] Along the Nankai trough, southwestern Japan, the Philippine Sea plate (PHS) is subducting beneath the Eurasian plate, and large interplate earthquakes have occurred repeatedly. The latest large thrust earthquake at the central Nankai trough off the Kii Peninsula was the 1944 Tonankai earthquake (Mw = 8.2). Although a previous ocean bottom seismograph (OBS) experiment from November 2001 to February 2002 showed seismicity around the rupture area of the 1944 Tonankai earthquake, there were large uncertainties regarding hypocenter locations, especially with respect to depth. We conducted another OBS experiment to obtain accurate locations of earthquakes and their focal mechanisms. The new results show earthquake clusters at the trough axis within the oceanic crust. The clusters were located near faults cutting the oceanic crust, and thus the earthquakes may have occurred along preexisting faults in the incoming PHS. Seismicity in the subducting PHS is characterized by seismic quiescence in the oceanic crust of the coseismic rupture area of the 1944 Tonankai earthquake. The change in seismicity in the oceanic crust can be explained by a change in the stress in the incoming, subducting PHS. The stress in the oceanic crust of the PHS changes from trough-normal tension at the trough axis, caused by the bending of the PHS, to downdip compression beneath the Kii Peninsula. The seismicity in the subduction zone likely relates to the balance of stress in the incoming and the subducting plate as well as to coupling between the subducting and overriding plates.
影响因子：
--
作者：
A. Nakanishi;N. Takahashi;Jin-Oh Park;S. Miura;S. Kodaira;Y. Kaneda;N. Hirata;T. Iwasaki;Masao Nakamura
通讯作者：
A. Nakanishi;N. Takahashi;Jin-Oh Park;S. Miura;S. Kodaira;Y. Kaneda;N. Hirata;T. Iwasaki;Masao Nakamura
多道地震剖面推断南开海槽东部周边断裂配置
DOI：
--
发表时间：
2002
期刊：
Marine Geology 187
影响因子：
--
作者：
N.Takahashi;H.Amano;K.Hirata;H.Kinoshita;S.Lallemant;H.Tokuyama;F.Yamamoto;A.Taira;K.Suyehiro
通讯作者：
K.Suyehiro
影响因子：
3
作者：
Kikuchi, M;Nakamura, M;Yoshikawa, K
通讯作者：
Yoshikawa, K