云南玉川断裂地震活动分析与研究

Seismic activity analysis and research of Yuchuan Fault in Yunnan Province

通过对玉川断裂及邻近区域的地震进行处理,并从地震地质、震源机制、地震的时、空、强等地震活动性进行分析和多方面探讨,得出玉川断裂具有右旋走滑活动性质,地震活动类型以双震或震群型为主,断裂孕育的最大地震为6.3级左右,地震活动频度较低,是普渡河断裂带南段主体发震构造断裂.特别是通过对玉川断裂附近M_L3.0~4.5级地震和云南省M_S≥5.0级地震进行分析研究,得到了以玉川断裂为主体活动构造形成了一个地震窗,窗口范围为(102°14'E,24°29'N),(102°38'E,24°08'N),(102°47'E,24°17'N),(102°23'E,24°38'N)所围矩形区域内,当窗内发生M_L3.0~4.5级地震,对云南省及邻近地区(101°~104°E、21°~28°N)范围内中强地震的发生具有较好的中期地震预测预报意义.

By processing and analyzing the earthquakes in Yuchuan Fault and its adjacent areas and analyzing the seismicity,the focal mechanism,the seismic activity of the earthquakes,and space-time-strength analysis of earthquake activity and discussions of many other aspectsthe earthquakes,we conclude:Yuchuan Fault has a dextral strike-slip activity; The types of earthquakes are mainly double tremors or swarm; The maximum seismogenic fault is about 6.3 and the frequency of seismic activity is low; It is the main quaternary tectonic fault of the southern section of Puduhe Fault.In particular,by analyzing and analyzing the M_L3.0—4.5 earthquakes near Yuchuan Fault and M_S≥ 5.0 earthquakes in Yunnan Province,a seismic window with the main active structure of the Yuchuan Fault was established with a window of(102 °14'E,24 °29'N),(102 °38'E,24 ° 08'N),(102 °47'E,24 °17'N),(102 °23'E,24 °38'N),which is a rectangular area.When the M_L3.0—4.5 earthquakes occur in the window,the prediction and prediction of medium-term earthquakes was very good for the occurrence of moderate-strong earthquakes in the range of 101 °—104 °E and 21 °—28 °N in Yunnan Province and its adjacent areas significance.