Active Faults along the Japan Trench relevant to Large Earthquake and Tsunami

MITSUHISA WATANABE; TAKASHI NAKATA; HIDEAKI GOTO; YASUHIRO SUZUKI

doi:10.14866/ajg.2011f.0.100137.0

Proceedings of the General Meeting of the Association of Japanese Geographers

Annual Meeting of the Association of Japanese Geographers, Autumn 2011

Session ID : 416

DOI https://doi.org/10.14866/ajg.2011f.0.100137.0

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Host: The Association of Japanese Geographers

Active Faults along the Japan Trench relevant to Large Earthquake and Tsunami

*MITSUHISA WATANABE, TAKASHI NAKATA, HIDEAKI GOTO, YASUHIRO SUZUKI

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Keywords: submarine active fault, large earthquake, tsunami, Japan Trench

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Abstract

We investigated characteristics of active faults along Japan Trench based on 3D anaglyph images. There are many normal faults on the outer rise. The average vertical slip-rate of each fault is ca. 1mm/y. An extensive reverse fault over 400-km long with long anticlinal bulge on its hanging wall cuts the landward slope of the trench. This fault is probably the source fault of the 2011 off the Pacific of Tohoku Earthquake (M9.0), as well as the very large historical events in 869 and 1611. The active fault less 200-km long may have originated the earthquake registered around M8.

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