西北地震学报2001，Vol.23Issue(2)：142-148,7.
宁夏南部地区地震活动特征
THE SEISMICITY FEATURES IN SOUTH NINGXIA
摘要
Abstract
The variation features of synthetic focal mechanism solution of small earthquakes before mid-strong earthquakes in south Ningxia region are studied.It is found that direction of the P axes drifted off average values and turned to E or SE,being accompanied by identified first motion mark of Pn and Pg waves of small earthquakes.The focal mechanism solutions of 6 mid-strong earthquakes in south Ningxia region show that the earthquakes occurred under the affect of principal compressive stress of NE,with no somewhat change in comparison with direction of principal compressive stress of regional stress field.So the possibility of the destructive earthquakes to occur in the region is smaller .But patterns of seismicity in recent years show it is possible that seismicity is going to concentrate in Zhongwei,Zhongning and Tongxin region in the future.关键词
宁夏/应力场/震源机制解/P轴/地震活动趋势分类
天文与地球科学引用本文复制引用
赵知军,刘秀景,任雪梅,谢晓峰..宁夏南部地区地震活动特征[J].西北地震学报,2001,23(2):142-148,7.
