経験的グリーン関数法に基づく2011年東北地方太平洋沖地震の震源モデル

- プレート境界地震の短周期レベルに着目して -

抄録

Source model composed of four strong motion generation areas (SMGAs) of the 2011 off the pacific coast of Tohoku earthquake (Mw9.0) is estimated by the empirical Green's function method. We also estimate the short period spectral level of interplate earthquakes (Mw6.0 to Mw7.8) in the Pacific plate including the aftershocks and foreshocks by the spectral inversion method. It is found that the short period spectral level of the main shock calculated from the estimated source model is consistent with the empirical scaling estimated in our previous study and this study for interplate earthquakes (Mw6.5 to Mw8.2). The SMGAs are located at deeper positions and are different from large slip areas. The total area SMGAs of the main shock is consistent with the empirical scaling in our previous study for interplate earthquakes (Mw 7.1 to Mw 8.2), but is much smaller than the empirical total area of asperities derived by Murotani et al..