[S07-P] Poster

[S07-P-19] Estimation of Empirical Green's Tensor Spatial Derivative Elements: A Preliminary Study using Strong Motion Records in Southern Fukui Prefecture, Japan

^○Michihiro Ohori (University of Fukui, Fukui, Japan)

In this report, I demonstrate the applicability of the EGTD method to simulate near-field strong-motion records for seven small events (MJ 3.7-4.2) that occurred in the southern part of Fukui Prefecture, Japan. Fukui Prefecture is an area with relatively low seismicity compared with other parts of Japan and strong motion data for EGTD estimation is less abundant. I targeted several nearby stations of the K-NET operated by the National Research Institute for Earth Science and Disaster Prevention (NIED). I performed EGTD inversion independently for each component for all time-sampling data. Using the estimated EGTD, I simulated the strong ground motion records for these events. The agreement between the observed and calculated waveforms for the all events is satisfactory over a long duration and there is a good match for the amplitude. The EGTD estimates in this report should be confirmed when future earthquakes occur around the same source area. This study targeted components lower than the corner frequencies of all events. Estimation of the broadband EGTD, including frequency ranges higher than corner frequencies, will be investigated in future work. I hope that this preliminary study in an area of relatively low seismicity is encouraging for the further investigation of EGTD estimation and evaluation of strong motion predictions using EGTD.