Strong Motion Simulation and Modeling of the 2001 Geiyo (MJ6.7), Japan, Earthquake, using the Empirical Green's Function Method

Abstract eng:
In this study, I carried out source parameter estimation and strong motion simulation of the 2001 Geiyo earthquake (MJ6.7), Japan. Data obtained at 10 KiK-net stations located at 19 to 66 km in epicentral distance is used. To focus on the source modeling without consideration about nonlinearity of soft surface layers, borehole records are targeted. First, to derive rough estimates of basic source parameters, I inverted spectral amplitude from the S-wave main portion of the mainshock and 12 aftershocks (MJ3.5 to 5.0). The moment magnitude, the corner frequency and the stress drop for the mainshock were estimated to be 6.3, 0.5 Hz and 377 bar, respectively. Next, using data from the largest aftershock as the empirical Green’s function, I estimated the relative moment release distribution on the fault plane and simulated the strong motion records targeting the mainshock in a range of 0.3 to 10 Hz. Waveform matching between synthesis and observed data is satisfactory. The maximum amplitudes of observed horizontal components from 10 stations were in a range of 24 to 123 gal in acceleration and 1.6 to 8.5 kine in velocity. At most of the stations, the observed maximum amplitudes were simulated successfully within a factor of 2.

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