福建仙游M_L4.1地震序列波速比变化

Analysis on the change of average seismic wave velocity ratios in Xianyou M_L 4.1 earthquake sequence,Fujian

应用多台和达法测定福建仙游M_L 4.1地震序列的M_L≥1.5地震波速比,其计算的相关系数较高,测得的波速比值具有较高的可信度。分析M_L 4.1主震前后的波速比发现,波速比经历低异常值—回升—相对稳定—下降—主震发生的过程,余震期里出现多次高异常值。

The average seismic wave velocity ratios of Xianyou ML 4. 1 earthquake sequence of ML≥ 1.5 earthquakes in Fujian are determined by use of multi-station methods. The correlation coefficient was calculated is high. the measured wave velocity ratio value is with high relia- bility. It is found by analyzing the wave velocity ratios before and after the main shock that they experienced a procedure of low abnormal values-rebound-relatively stable-decrease and finally the main shock occurred. In the aftershock stage, multiple times high abnormal values appeared.