Abstract: Using the multi-station methods we calculated the seismic wave velocity ratio for earthquakes(M_L≥2.0) occurred from February 4, 2006 to April 3, 2006.Using the high molar figure seismic events, the results show that distinct low value anomalies of seismic velocity ratio before the strong earthquakes. The course of distinct low value anomalies of seismic wave velocity ratio is decline—sustained anomaly—recovery—occurrence. The analytical result indicates that the anomaly result is credible.

Key words: Multi-station method, Average wave velocity ratio, Low value anomaly, Shanxi reservoir of Wenzhou