Prompt Estimation of Strong Ground Motion Near Focal Region Based on Fault Inversion from Acceleration Records

Abstract eng:
The inversion technique on the basis of acceleration envelope fitting is applied for two recent inland earthquakes. One is the Noto Hanto Earthquake in 2007 (M=6.9) and the other is the Niigataken Chuetsu-oki Earthquake (M=6.8). The base-rock strong motion records obtained by K-NET and KiK-net observation systems are converted to those for engineering base-rock level with the shear wave velocity of Vs=500-600 m/sec. These acceleration time histories are used for the inversion of faults focusing on the asperity distribution on the assumed fault location. Next, on the basis of the estimated fault models including the asperity distribution, the strong ground motions are simulated at all over the areas around the faults. The characteristic of the distribution of the JMA (Japan Meteorological Agency) seismic intensity is compared with that from the observed strong motion records. The degree of dependence of the seismic intensity distribution on the asperity distribution is discussed in the comparison for the case of intermediate and relatively large fault events.

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