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从地质构造背景、余震活动、地震地表破裂及其位移分布特征和强地面运动等方面,分析了1995年1月17日日本阪神7.2级地震发震构造的几何学和动力学特点,认为野岛断裂和六甲山断裂走向相同,但倾向相反,上升盘与下降盘呈对角对称分布,属于逆走滑断裂.它们构成一条枢纽性走滑断裂,阪神地震就发生在该断裂的枢纽轴部,走滑断裂的枢纽运动导致了此次强震的孕育和发生.走滑断裂的枢纽运动常常伴随着大地震的发生,其动力学原因可以通过矩形截面梁扭转的应力分析来模拟.在一定的震中距范围内,地震地表破裂的位错量、余震密集程度以及峰值加速度随震中距的变化规律,有如在扭转的矩形截面梁内部从中心向周围的剪切应力大小的改变.最后,从特定的地质构造环境和构造力学条件,分析了神户市地震破坏最严重地区的分布特点.本文的研究结果不仅在识别中长期地震危险区,而且在合理地建立地震灾害预测模型等方面都有一定的应用价值
From the aspects of geological structure background, aftershock activity, surface rupture and its distribution of displacement and strong ground motion, the paper analyzes the geometric and dynamic characteristics of the seismogenic structure of the Hanshin-M 7.2 M Japan earthquake on January 17, 1995, The Nojima fault and the Rokko mountain strike the same direction, but with the opposite trend, the ascending disk and the descending disk are diagonally symmetrical and belong to the anti-strike-slip fault. They form a pivotal strike-slip fault, and the Hanshin earthquake occurred at the pivotal axis of the fault. The pivotal movement of the strike-slip fault resulted in the occurrence and occurrence of the strong earthquake. The hub movement of strike-slip faults is often accompanied by a large earthquake, and its dynamics can be simulated by the stress analysis of torsion of rectangular cross-section beams. Within a certain range of epicenter distance, the amount of dislocations, the intensity of aftershocks and the peak acceleration of the earthquakes vary with the epicenter distance. For example, the change of the shear stress from the center to the periphery of the torsional rectangular section beam. Finally, according to the specific geotectonic environment and tectonic mechanics conditions, the distribution characteristics of the earthquake-stricken areas in Kobe are analyzed. The results of this paper not only identify the mid-long term earthquake hazard area, but also have certain value in the reasonable establishment of the earthquake disaster prediction model