摘要
从寻乌5 5级地震的地震地质构造背景、宏观震害考察结果,结合近场强地面运动观测中几次较大地震的加速度峰值,分析宏观烈度分布特征,认为烈度分布特征除了受构造控制外,还与地形、地基土质条件有关,极震区长轴方向显示鸡笼嶂—寻乌—八尺北西向断裂是寻乌地震的主要发震断层,发震构造受控于华南块体构造应力场,发震区处于北北东向河源-邵武断裂中段和东西向断裂交汇部位。
Based on the survey results of the seismogeological tectonic background and the macroseismic hazard of Xunwu earthquake, combining with the acceleration peak values of several large aftershocks in near-field, we analyzed the macrointensity distribution features. The results show that the intensity distribution features are relative to the seismogeological tectonic, landform and soil foundation. The direction of the long axis in the meizoseismal region indicates that the main seismogenic fault of this earthquake is the NW-trending Jilong-Xunwu-Bachi fault. The statutory of the fault is controlled by the tectonic stress field of South China Block. The sesimogenic area is located at the conjunct part of the middle segment of the NNE-trending fault and EW-trending fault of Heyuan-Shaowu fracture zone.
出处
《华南地震》
2002年第4期1-8,共8页
South China Journal of Seismology
