摘要
四川鲜水河断裂带、龙门山断裂带和安宁河断裂带展布和交汇的“三叉口”地区处于特殊的构造部位。本文就该区地震活动的主体格局,弱小地震活动,中强震前的异常表现,小震群活动及其前兆意义等问题进行了探讨。该区作为地震活动“窗口”有显著的意义。当弱震频度和震级出现选定异常或出现了小震群以后,可能预示省内未来发生强震的危险。
Sanchakou area, where Xianshuihe fault zone, Longmenshan fault zone and Anninghe fault zone strech and converge, is located in a special tectonic location. In this paper, we studied overall frame- work of seismicity, small earthquake activity, anomalies before middle earthquakes, small seismic cluster activity and their precursory significance in Sanchakou area. This area has outstanding signifi- cance as a seismicity 'window' when selected anomalies or small seismic clusters appear in small earth- quake frequency and magnitude, the risk of strong earthquake may be betokened.
出处
《四川地震》
1991年第2期25-35,共11页
Earthquake Research in Sichuan
