Source characterization is needed to predict strong ground motions during large earthquakes. For characterizing the complex source process, Somerville et al. (1999) compiled slip models of fifteen earthquakes mainly in western North America for various magnitude range and obtained an empirical relation between asperity parameters and seismic moment. We estimate slip models of recent three M6 class earthquakes in Japan using records of dense strong ground motion network of K-NET. One is dip-slip earthquake and the other two are strike-slip earthquakes. We obtain asperity parameters of three earthquakes following the same criterion by Somerville et al. (1999). Rupture areas and combined areas of asperities of three earthquakes agree with those deduced from the empirical relation by Somerville et al. (1999). The average slips of three earthquakes are about a half of those deduced from the empirical relation. The large slip appears at the depth from 4 to 10 km for strike-slip earthquakes and appears shallower depth at about 4km for dip-slip earthquakes in this study.
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