3:30 PM - 3:45 PM
[SSS04-01] Improved seismic hazard assessment after the 2011 Great East Japan Earthquake
Keywords:National Seismic Hazard Maps for Japan, strong-motion, seismic hazard, probability, J-SHIS
The 2011 Great East Japan Earthquake (Mw 9.0) was the largest event in the recording history of Japan. This mega-thrust earthquake was not yet considered in the National Seismic Hazard Maps for Japan before it occur. Based on the lessons learned from this earthquake disaster, much efforts are being progressed to revise the seismic hazard assessment for Japan. We, as project staffs of the NIED, try to clarify the existed SHA problems and issues to be resolved and make proposals to improve seismic hazard assessment for Japan.
(1) Re-modeling of seismic activity with no oversight to low-probability earthquakes.
(2) Improvement of strong-motion evaluation considering low-probability earthquakes.
(3) Development of methodology for complementary use of PSHM and SESM.
(4) Improvement of techniques for prediction of strong-motion for mega earthquakes.
(5) Improvement of utilization and transmission of seismic hazard information.
We have made a series of revisions of the seismic hazard assessment based on the revised versions of the long-term evaluation of seismic activity made by HERPJ. The newer revisions of long-term evaluation for seismic activity by HERPJ are still undergoing and then, we will update and revise continuously for the seismic hazard assessment.