Configuration of subducting Philippine Sea plate and crustal structure in the central Japan region
Configuration of subducting Philippine Sea plate and crustal structure in the central Japan region
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DOI：
10.1029/2002gl016517
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发表时间：
2003-03
影响因子：
5.2
通讯作者：
T. Iidaka;T. Iwasaki;T. Takeda;T. Moriya;I. Kumakawa;E. Kurashimo;T. Kawamura;F. Yamazaki;K. Koike;G. Aoki
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文献类型：
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作者：
T. Iidaka;T. Iwasaki;T. Takeda;T. Moriya;I. Kumakawa;E. Kurashimo;T. Kawamura;F. Yamazaki;K. Koike;G. Aoki
2001年8月，在日本中部地区进行了6个爆炸震源和391个地震台的地震试验。沉积层厚度横向变化较大。测得沉积层以下的P波速度值为5.3公里/S∼5.8公里/S，上地壳下部的P波速度为6.0公里/S∼6.4公里/S，下地壳的P波速度值为6.6公里/S∼6.8公里/S。在Sshot-J5的记录部分观察到两个明显的后期阶段。这些相位被解释为深度约为10-20公里和20-35公里的边界上的反射波。深部边界的倾角约为26°。浅层反射层被解释为岩性边界。较深的反射体是俯冲菲律宾海板块的上界。揭示了俯冲菲律宾海板块的构造特征。
A seismic experiment with 6 explosive sources and 391 seismic stations was conducted in August 2001 in the central Japan region. A large lateral variation of the thickness of sedimentary layer was observed. P‐wave velocity values below the sedimentary layer obtained were 5.3 km/s ∼ 5.8 km/s. P‐wave velocity values at the lower part of upper crust and lower crust are estimated to be 6.0 km/s ∼ 6.4 km/s and 6.6 km/s ∼ 6.8 km/s, respectively. Two clear later phases were observed at the record section of shot‐J5. The phases are interpreted to be reflected waves at the boundaries with depths of about 10–20 km and 20–35 km. The dip angle of the deep boundary is about 26°. The shallower reflector is interpreted to be a lithological boundary. The deeper reflector is the upper boundary of subducting Philippine Sea plate. The configuration of the subducting Philippine Sea slab was revealed.