Tomography of northeast Japan forearc and its implications for interplate seismic coupling

O. P. Mishra, Dapeng Zhao, N. Umino, A. Hasegawa

doi:10.1029/2003gl017736

Tomography of northeast Japan forearc and its implications for interplate seismic coupling

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O. P. Mishra

Geodynamics Research Center Ehime University Matsuyama Japan
Dapeng Zhao

Geodynamics Research Center Ehime University Matsuyama Japan
N. Umino

Research Center for Prediction of Earthquakes and Volcanic Eruptions Tohoku University Sendai Japan
A. Hasegawa

Research Center for Prediction of Earthquakes and Volcanic Eruptions Tohoku University Sendai Japan

書誌事項

公開日: 2003-08

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/2003gl017736

公開者: American Geophysical Union (AGU)

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説明

<jats:p>We determined, for the first time, a 3‐D seismic structure of P and S wave velocity (Vp, Vs) in the forearc region of northeast (NE) Japan from the Pacific coast to the Japan Trench using a large number of high‐quality arrival times from sub‐oceanic earthquakes that are well located with sP depth phase data. Strong lateral heterogeneities in Vp and Vs are revealed. A majority (95%) of great interplate earthquakes are located outside the low‐V zones while a few (5%) of them are located inside the low‐V zones. This may suggest a different degree of interplate seismic coupling at the plate interface parallel to Japan Trench. The low‐V zones probably contain fluids and may represent decoupled areas. We propose that this new approach of investigating 3‐D seismic structure can be applied to other forearcs of the world for a better understanding of interplate coupling and its influence on big earthquakes.</jats:p>