J-SHIS - an integrated system for knowing seismic hazard information in Japan

Abstract:

An integrated system of Japan seismic hazard information station (J-SHIS) was established in 2005 for issuing and exchanging information of the National Seismic Hazard Maps for Japan that are based on seismic hazard assessment (SHA).

A simplified app, also named J-SHIS, for smartphones is popularly used in Japan based on the integrated system of http://www.j-shis.bosai.go.jp/map/?lang=en. “Smartphone tells hazard” is realized on a cellphone, a tablet and/or a PC.

At a given spot, the comprehensive information of SHA map can be easily obtained as below:

1) A SHA probability at given intensity (JMA=5-, 5+, 6-, 6+) within 30 years.

2) A site amplification factor varies within 0.5 ~ 3.0 and expectation is 1 based on surface geology map information.

3) A depth of seismic basement down to ~3,000m based on deeper borehole and geological structure.

4) Scenario earthquake maps: By choosing an active fault, one got the average case for different parameters of the modeling. Then choose a case, you got the shaking map of intensity with color scale.

 “Seismic Hazard Karte tells more hazard” is another app based on website of http://www.j-shis.bosai.go.jp/labs/karte/.

(1) For every mesh of 250m x 250m, professional service SHA information is provided over national-world.

(2) With five ranks for eight items, comprehensive SHA information could be delivered.

(3) Site amplification factor with an average index is given.

(4) Deeper geologic structure modeling is provided with borehole profiling.

(5) A SHA probability is assessed within 30 and/or 50 years for the given site.

(6) Seismic Hazard curves are given for earthquake sources from inland active fault, subduction zone, undetermined and their summarization.

(7) The JMA seismic intensities are assessed in long-term averaged periods of 500-years to ~100,000 years.

 The app of J-SHIS can be downloaded freely from http://www.j-shis.bosai.go.jp/app-jshis.