论文部分内容阅读
本文对1979年3月2日固镇5.0级地震的主震参数、震前的地震活动以及地震序列的特征进行了一些研究。结果表明:震前在震中附近区域存在小震活动的空区。空区形成后,小震的频度、b值、应变释放等参量出现了异常变化。一定区域的波速比在震前也有异常显示。同时,临震前于空区的边缘发生了一组具有某些临震信息的地震。文中也对余震序列的概况作了介绍,指出该序列具有机制稳定、b值较低等与一般余震序列不同的特征。
In this paper, some researches on the main shock parameters, the seismic activity before the earthquake and the characteristics of the earthquake sequence are carried out on the March 5.0 earthquake of Guzhen Town on March 2, 1979. The results show that there are little earthquakes in the vicinity of the epicenter before earthquakes. After the formation of the vacant area, the frequency of small earthquakes, b value, strain release and other parameters appeared abnormal changes. The wave velocity ratio in a certain area also shows abnormally before the earthquake. In the meantime, a group of earthquakes with some temporary earthquakes occurred at the edge of the vacant area before the earthquake. The paper also introduced the overview of aftershock sequences, and pointed out that this sequence has the characteristics of stable mechanism, low b value and other characteristics of the general aftershock sequence.