摘要
应用多台和达法测定福建仙游震群M_L≥1.0地震的平均波速比,在考虑一定震中距及台站数计算情况下,测得的波速比值相对稳定、可靠,计算的相关系数高,剩余标准差小,具有较高的可信度。对波速比值的总体变化特征的分析,结果显示:仙游震群波速比变化复杂,总体经历了高异常值-低异常值-高异常值-相对稳定-主震发生的过程;主震及较大余震发生后,波速比的高、低异常值增多,且低异常值频次较高于高异常值。对小区域的波速比变化分析发现:不同区域相对主震前后,异常值变化情况差别较大,从震群波速比整体特征讨论波速比变化异常情况,是否范围过大,有待于更多案例的检验分析。
The paper measured the average wave velocity ratios of earthquakes with M_L≥1.0 in Fujian Xianyou earthquake swarm by using multi-station methods. In consideration of certain epicentral distance and the calculation of the number of stations, the measured velocity ratio is relatively stable and reliable, which has high correlation coefficient, small residual standard deviation, and high credibility. The paper analyzed the overall variation of wave velocity ratio. The results show that： the wave velocity ratio changes of Xianyou earthquake swarm is complicated, and experienced the process of high outliers- low outliers- high outliers- relatively stable- the process of the main shock occurred; after the main shock and the large aftershocks, high and low outliers of wave velocity ratio increases, and the frequency of low outliers is higher than the high outliers. Basedon the analysis of the wave velocity ratio in small region, it is found that the outlier changes are different in the different regional before and after the main shock; weather the range is too large for disussing the abnormal variation of the wave velocity ratio by using the overall characteristics of the wave velocity needs more case analysis for the test.
出处
《华南地震》
2016年第3期88-97,共10页
South China Journal of Seismology
关键词
福建仙游
震群
和达法
波速比
Fujian xianyou
Earthquake swarm
Multi-station methods
wave velocity ratio
