| 宁夏南部地区地震活动特征 |
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| 引用本文： | 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. |
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| 作者姓名： | 赵知军 刘秀景 任雪梅 谢晓峰 |
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| 作者单位： | 宁夏回族自治区地震局, |
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| 摘 要： | 研究了宁夏南部地区（35°20＇～37°40＇N，104°30＇～106°30＇E）小震综合机制解的变化特征．发现在中强地震前，该地区小震综合机制解的P轴方位偏离平均值，向E或SE偏转，其仰角有增大的趋势，同时小震纵波（Pn和Pg）初动符号一致．6次中强地震的震源机制解表明，该地区P轴方位与主压应力方向基本一致，因此该地区发生破坏性地震的可能性不大．近几年来的地震活动图像显示，该地区的地震活动有向中卫、中宁和同心地区集中的迹象．
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| 关 键 词： | 宁夏 应力场 震源机制解 P轴 地震活动趋势 |
| 文章编号： | 1000-0844（2001）02-0142-07 |
| 收稿时间： | 2000/3/16 0:00:00 |
| 修稿时间： | 2000年3月16日 |
THE SEISMICITY FEATURES IN SOUTH NINGXIA |
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| ZHAO Zhi-jun,LIU Xiu-jing,REN Xue-mei and XIE Xiao-feng.THE SEISMICITY FEATURES IN SOUTH NINGXIA[J].Northwestern Seismological Journal,2001,23(2):142-148. |
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| Authors: | ZHAO Zhi-jun LIU Xiu-jing REN Xue-mei and XIE Xiao-feng |
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| Institution: | Seismological Bureau of Ningxia Hui Autonomous Region, Yinchuan 750001, China,Seismological Bureau of Ningxia Hui Autonomous Region, Yinchuan 750001, China,Seismological Bureau of Ningxia Hui Autonomous Region, Yinchuan 750001, China and Seismological Bureau of Ningxia Hui Autonomous Region, Yinchuan 750001, China |
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| 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 P n and P g 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. |
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| Keywords: | Ningxia Stress field Focal mechanism solution P axis Trend of seismicity |
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