HR: 1330h
AN: S32A-0832    [PDF]
TI: Structural studies beneath Honshu and Hokkaido Japan: integrating refraction studies with receiver function analysis.
AU: * Smith, R J
EM: asmith@jamstec.go.jp
AF: Institute for Frontier Research on Earth Evolution, Japan Marine Science and Technology Center (JAMSTEC) Showa-machi 3175-25, Kanazawa-ku, Yokohama, 236-0001 Japan
AU: Volti, T
EM: tvolti@jamstec.go.jp
AF: Institute for Frontier Research on Earth Evolution, Japan Marine Science and Technology Center (JAMSTEC) Showa-machi 3175-25, Kanazawa-ku, Yokohama, 236-0001 Japan
AU: Nakanishi, A
EM: ann@jamstec.go.jp
AF: Institute for Frontier Research on Earth Evolution, Japan Marine Science and Technology Center (JAMSTEC) Showa-machi 3175-25, Kanazawa-ku, Yokohama, 236-0001 Japan
AB: Combining land seismic, offshore seismic, and receiver function structure, allows delineation of the main structural discontinuities beneath the Japanese Islands. The location of the subducting Pacific and Philippine Sea Plates can also be discerned. The focus areas of study are beneath Hokkaido, Northern Japan and the Tokai Region, Southwest/Central Japan. Both regions have detailed offshore/onshore seismic reflection and refraction studies that have been carried out by JAMSTEC (Japanese Marine Science and Technology Center). In this study the seismic crustal study is supplemented with analysis of teleseismic events. Teleseismic data is obtained from NIED (Natural Research Institute for Earth Science and Disaster Prevention) F-net broadband network. Integrating the receiver function study with velocity structure from the seismic experiments allows determination of the depth to the Moho discontinuity and the subducting plate. The non-uniqueness of the receiver function study for shallower structure is removed by the addition of the wide-angle information. The inclusion of shear wave splitting analysis should help remove the influence of shear wave anisotropy in the model. This is a first step in construction of a more accurate 3D structural velocity model for future modeling of geologic processes and earthquake relocation for the Japanese Islands region.
DE: 7205 Continental crust (1242)
DE: 7218 Lithosphere and upper mantle
DE: 7230 Seismicity and seismotectonics
DE: 8120 Dynamics of lithosphere and mantle--general
SC: Seismology [S]
MN: 2003 Fall Meeting