ACCURACY OF METHODS TO ESTIMATE EARTHQUAKE GROUND MOTION USING MAIN SHOCK OBSERVATION RECORDS AND THE MEASURE FOR IMPROVEMENT - SEISMIC WAVEFORM ESTIMATION AT FOCAL AREAS FOR THE 2008 IWATE-MIYAGI NAIRIKU EARTHQUAKE -

Abstract

 Great geo-disaster occurred during the 2008 Iwate-Miyagi Nairiku Earthquake. Reliable estimation of seismic motion at damage sites is required to clarify the mechanism of damage. In this study, accuracy of the method to estimate strong earthquake ground motions was investigated quantitatively at the observing stations in the focal area by comparing the estimated ground motions with the observed ones. The results indicates that the methods based on the aftershock observation or microtremor measurement at the damage site lead to reliable estimation of strong ground motions.