Detailed plate boundary structure off northeast Japan coast

Narumi Takahashi, Shuichi Kodaira, Tetsuro Tsuru, Jin Oh Park, Yoshiyuki Kaneda, Hajimu Kinoshita, Shintaro Abe, Minoru Nishino, Ryota Hino

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

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 layer1 overlying the oceanic crust subducting down to at least near 18 km by comparing observed waveforms with these calculated using the reflectivity method.

Original languageEnglish
Pages (from-to)1977-1980
Number of pages4
JournalGeophysical Research Letters
Volume27
Issue number13
DOIs
Publication statusPublished - 2000 Jul 1

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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