摘要
根据小江断裂带历史强震资料、近期中小地震活动资料、地震波参数、会泽5．3级地震破裂方向及其序列参数显著异常等，研究了小江断裂带强震活动规律、中强地震丛集活动与断裂构造活动关系、会泽地震后小江断裂及周围地区应力场状态，结果得出：①会泽周围M≥5．0地震丛集活动达10次左右后，小江断裂及周围地区将发生M≥6．7地震；②会泽地震发生后，其附近3级以上中小地震活动空间展布方向与小江断裂北东向深部隐伏次级断裂的方向一致；③会泽地震发生后，其附近中小地震波参数规一化环境剪应力‰值与本次地震序列参数b值异常显著；④会泽地震余震震源较深，90％可测定深度的余震震源深度在16～30km范围内，比震前震源区周围的地震深。
According to the Xiaojiang fault＇s historical strong earthquake data, recent moderate-small earthquake data, seismic wave parameters, the rupture direction of the Huize, Yunnan, M5.3 earthquake and the distinct anomalies of its sequence parameters, we studied the regulation of strong earthquake activity in the Xiaojiang fault, the relation between concentrated moderate earthquake cluster activity and tectonic activity, and the stress field in and around the Xiaojiang fault after the Huize earthquake. The results show： （ 1 ） when the number of concentrated earthquakes with M≥5 around Huize is about ten, the earthquake with M≥6. 7 will occur in the Xiaojiang fault or its vicinity; （2） after the Huize earthquake, the spatial distribution of the M≥3 earthquakes near Huize agrees with the direction of the deep NE-trending concealed sub-fault of the Xiaojiang fault; （3） after the Huize earthquake, the normalized ambient shear stress value τ0c calculated by using moderate-small earthquake wave data and the b-value of the sequence are anomalous obviously; （4） the aftershocks are deep relatively, the depth of more than 90% aftershocks which can be determined is in the range of 16 -30 km, deeper than the earthquakes occurred near the source region before the Huize earthquake.
出处
《地震研究》
CSCD
北大核心
2006年第4期332-337,共6页
Journal of Seismological Research
关键词
会泽地震
小江断裂
地震活动
应力
序列参数
Huize earthquake, Xiaojiang Fault, seismicity, stress, sequence parameter
