Multi-beam Bathymetric Survey off Tokachi Challenging to evaluate evidences of the pre/post seismic deformation

Development of IFREE Geophysical Database System

Abstract

The 2003 off Tokachi earthquake with Mw 8.0, thought to be a megathrust earthquake, occurred on 26 September in 2003. The R/V KAIREI KR03-14 (JAMSTEC) surveyed off Tokachi in December of 2003, focusing on the multi-channel seismic (MCS) and multibeam bathymetry sueveys to find any traces after the shock. We have already operated geophysical line/box surveys including bathymetry, gravity, and total and three-component geomagnetics, MCS survey and submersible investigations during Legs KR99-02 in July of 1999, KR00-04 in June of 2000 and YK02-02 in May of 2002, which are all including and the public domain in the Geophysical Database on the web site.