摘要
利用S波分裂的方法,分析了2003年2月14日新疆石河子5.4级地震前后多台所记录的小地震的S波分裂特征,发现震源附近地区的S波分裂特征对中强震仍有一定的前兆意义。震中附近的3个地震台记录的S波偏振方向在5.4级地震前出现由原来与区域应力场一致的NE向转为NW向震后又转回NE向。5.4级地震前各台记录的慢波延迟时间总体表现出由小变大的特征。
We used S-wave split method to analyze the S-wave split character of small shocks recorded by many stations before the Shihezi, Xinjiang, around M \-S5.4 earthquake on Feb. 14, 2003, and found the S-wave split character around the epicenter shown some precursor of the event. Before the shock, the S-wave polarization direction that recorded by 3 stations around the epicenter turned to NW from NE consistent with the direction of regional stress field; but after the shock, it turned to NE again. And in general, the slow wave delay time shown the feature from short to long before the earthquake.
出处
《内陆地震》
2004年第3期212-220,共9页
Inland Earthquake
基金
十五重点科研项目
100501-01-07
十五2001BA601B01-03-03
中国地震局三结合课题
200111资助.
关键词
S波分裂
慢波延迟时间
快波偏振方向
新疆
S-wave split
Slow wave delay time
Fast wave polarization direction
Xinjiang
