甘肃岷县两次中强地震震源机制研究

Focal Mechanisms of Two Moderate Earthquakes in Minxian,Gansu,in 2003

利用地震震中周围7个台站的数字记录反演了甘肃岷县2003年11月13日ML5·5和2004年9月7日ML5·2地震的矩张量,得出了震源机制。将所得结果与用P波初动符号的结果进行了比较,二者具有较好的一致性。结合该地区的地震分布,对可能的发震断层进行了讨论。

A ML5. 5 and a ML5. 2 earthquake shook Minxian, Gansu respectively on Nov. 13, 2003 and Sep. 7, 2004. The seismic moment tensors of the two earthquakes were inverted using 3-component digital records of 7 digital stations around the epicenters and compared with the result from the P-wave initial motion. The two results are consistent. Combined with the distribution of the earthquakes in this area, the possible generating fault was discussed.