基于沈阳台的辽宁省地区波速比变化研究

Study on Variation of Wave Velocity Ratio(Vp/Vs) in Liaoning Province Based on the Data of Shenyang Seismic Station

利用辽宁数字地震台网的地震观测报告和沈阳地震台数字化地震记录,计算了沈阳台记录到的2008年1月1日至2018年1月1日辽宁地区M_L3.0级以上地震的波速比,同时将辽宁地区(38～44°N,119～125°E)以沈阳台为中心划分为四个象限分区进行分析讨论各区波速比随时间的变化。结果显示在对应第三象限的分区中发生的中强地震波速比急剧下降,这和辽宁地区的中强度地震有着紧密的联系。经过对比地震波速比的数值以及地震等级,我们可以清晰地看出这两者之间与地震险情存在某种程度上的关联,对波速比变化的研究对未来地震趋势的预测有一定的应用价值。

In this paper, the seismic observation report of Liaoning digital seismic network and the digital seismic record of Shenyang Seismic Station are used. The velocity ratio of earthquakes in Liaoning area recorded from January 1st, 2008 to January 1st, 2018 is calculated in Shenyang Seismic Station. In the calculation, the Liaoning area(38~44°N, 119~125°E) was divided into four quadrants by the center of Shenyang. And then the variation of the velocity ratio of each area was analyzed. The results show that the strong seismic wave velocity ratio decreases sharply in the region of the third quadrant, which is closely related to the medium intensity earthquake in Liaoning Province. And this data can be used as the basis for predicting the earthquake danger in Liaoning area. By comparing the numerical value of the seismic wave velocity and the magnitude of the earthquake, we can clearly see that there is a certain degree of correlation between the two, and the study of the change of the velocity ratio has certain application value to the prediction of the future earthquake trend.