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JDR Vol.8 No.5 pp. 848-860
(2013)
doi: 10.20965/jdr.2013.p0848

Paper:

Seismic Hazard Assessment for Japan: Reconsiderations After the 2011 Tohoku Earthquake

Hiroyuki Fujiwara*, Nobuyuki Morikawa*, and Toshihiko Okumura**

*National Research Institute for Earth Science and Disaster Prevention, 3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan

**Shimizu Corporation, 3-4-17 Etchujima, Koto-ku, Tokyo 135-8530, Japan

Received:
May 1, 2013
Accepted:
July 11, 2013
Published:
October 1, 2013
Keywords:
seismic hazard assessment, strong ground motion, seismic hazard map, J-SHIS
Abstract

Under the guidance of the Headquarters for Earthquake Research Promotion of Japan, we have been carrying out seismic hazard assessment for Japan since the 1995 Hyogo-ken Nanbu Earthquake and have made the National Seismic Hazard Maps for Japan to estimate strong motion caused by earthquakes that could occur in Japan in the future, and show estimated results on these maps. The Hazard Maps consist of two kinds of maps. One kind is a probabilistic seismic hazard map that shows the relation between seismic intensity value and its probability of exceedance within a certain period. The other kind is a scenario earthquake shaking map. In order to promote the use of the National Seismic Hazard Maps, we have developed an open Web system to provide information interactively, and have named this system the Japan Seismic Hazard Information Station (J-SHIS). The 2011 Tohoku Earthquake (Mw9.0) was the largest such event in the recorded history of Japan. This megathrust earthquake was not considered in the National Seismic Hazard Maps for Japan. Based on lessons learned from this earthquake disaster and on experience we have had in the seismic hazardmapping project of Japan, we consider problems and issues to be resolved for seismic hazard assessment and make proposals to improve seismic hazard assessment for Japan.

Cite this article as:
Hiroyuki Fujiwara, Nobuyuki Morikawa, and Toshihiko Okumura, “Seismic Hazard Assessment for Japan: Reconsiderations After the 2011 Tohoku Earthquake,” J. Disaster Res., Vol.8, No.5, pp. 848-860, 2013.
Data files:
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Last updated on Mar. 05, 2021