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本文用1995年1月17日阪神地震的6个近场强地面运动速度记录的模拟确定了这次地震过程中主要的小事件的震源机制和震源位置。用反射法计算了前向模拟的点源响应,结果表明4源模型与观测资料相适应。4个小事件几乎都位于相对震中NE55°的方向上,意味着它们均由六甲山地断层或它与其他小断层有联系的次生结构所触发。这些小事件的震源深度分别是17,8,6和6km,震中距分别是0,10,18和25km。它们具有相同的走滑型震源机制。第1个小地震的地震矩最大,其走向、倾角和滑动角分别为230°,75°和170°。
In this paper, the simulations of six near-field strong ground motion records of the Hanshin earthquake on January 17, 1995 confirm the focal mechanism and source location of the major small events during this earthquake. The point source response of forward simulation was calculated by reflection method. The results show that the 4-source model is compatible with the observed data. Almost all four of the four small events are located in the direction of the NE55 relative to the epicenter, meaning they are all triggered by the Rokko mountain fault or its secondary structure, which is linked to other small faults. The focal depths of these small events are 17, 8, 6 and 6 km, respectively, and the epicentral distances are 0, 10, 18 and 25 km respectively. They have the same strike-slip focal mechanism. The first earthquakes have the highest seismic moment with strike, dip and slip angles of 230 °, 75 ° and 170 °, respectively.