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Detailed plate boundary structure off northeast Japan coast
Author(s) -
Takahashi Narumi,
Kodaira Shuichi,
Tsuru Tetsuro,
Park JinOh,
Kaneda Yoshiyuki,
Kinoshita Hajimu,
Abe Shintaro,
Nishino Minoru,
Hino Ryota
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl008501
Subject(s) - forearc , geology , seismology , oceanic crust , subduction , crust , convergent boundary , island arc , seismometer , arc (geometry) , pacific plate , plate tectonics , mantle (geology) , inversion (geology) , geophysics , tectonics , geometry , mathematics
In 1997, a seismic experiment using an airgun array and ocean bottom seismographs (OBSs) was performed in the forearc region of the northeast Japan (NEJ) arc. The objectives of this experiment were to clarify whole of the velocity structure around the forearc region of NEJ arc including a detailed plate boundary structure and the heterogeneous structure. In this paper, we estimated the heterogeneous velocity structure around the forearc region of northeast Japan by applying 2‐D ray tracing and travel time inversion to the airgun‐OBS data. The depth where the island arc Moho comes into contact with the subducting oceanic crust is about 20 km. We suggest the existence of an oceanic layerl overlying the oceanic crust subducting down to at least near 18 km by comparing observed waveforms with these calculated using the reflectivity method.