[1]李 娟,徐 岩,韩晓明,等.2013年科左后旗5.3级地震前后的P轴转向和应力场变化分析[J].华南地震,2019,39(增刊):97-101.[doi:10.13512/j.hndz.2019.S1.016]
　LI Juan,XU Yan,HAN Xiaoming,et al.P-axis Turning Phenomenon and Stress Field Change before and after the Kezuohouqi M 5.3 Earthquake in 2013[J].South China journal of seismology,2019,39(增刊):97-101.[doi:10.13512/j.hndz.2019.S1.016]
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2013年科左后旗5.3级地震前后的P轴转向和应力场变化分析()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
39
期数:
2019年增刊
页码:
97-101
栏目:
华南地震
出版日期:
2019-10-31

文章信息/Info

Title:
P-axis Turning Phenomenon and Stress Field Change before and after the Kezuohouqi M 5.3 Earthquake in 2013
作者:
李 娟; 徐 岩; 韩晓明; 张 帆
内蒙古自治区地震局，呼和浩特 010051
Author(s):
LI Juan; XU Yan; HAN Xiaoming; ZHANG Fan
Inner Mongolia Autonomous Region Earthquake Agency，Hohhot 010051，China
关键词:
震源机制; 科左后旗5.3级地震; P轴转向; 应力场
Keywords:
Focal mechanism; Kezuohouqi M 5.3 earthquake; P-axis turning; Stress field
DOI:
10.13512/j.hndz.2019.S1.016
文献标志码:
A
摘要:
为了考察2013年4月22日科左后旗5.3级地震震中区域应力场的中短期变化过程，选取2009年以来发生在开鲁坳陷的ML≥3.0级地震作为研究对象，应用Focmec方法计算了17次地震的震源机制解，根据震源机制解结果绘制的P轴时序分布图显示，在科左后旗地震前，震中区应力场的P轴方位首先表现出中期阶段的“一致性”变化，接着出现短期时段的大幅波动，科左后旗M 5.3级地震则发生在短期显著紊乱过程中，表明开鲁坳陷的P轴趋于一致具有中期指示意义，震前3个月左右出现的P轴大幅度转向具有短期指示意义，科左后旗5.3级地震发生前后，部分余震均表现出与主震较为统一的走滑型机制，压应力轴和张应力轴分别做顺时针和逆时针旋转运动。
Abstract:
In order to investigate the stress field variation in the epicenter of the Kezuohouqi M 5.3 earthquake on April 22nd，2013，the focal mechanism solutions of the earthquakes with ML≥ 3.0 occurred in Kailu sag since 2009 were calculated by Sonke method. The P axis temporal distribution map showed that，before the Kezuohouqi earthquake，the P-axis azimuth of the stress field in the epicentral region first shows the “consistency”change in the middle stage，then there is a large fluctuation in the short-term period，while the Tongliao M 5.3 earthquake occurs in the process of short-term significant disturbance. The consistency trend of P axis is indicative in the medium term，and the P-axis turning phenomenon about 3 months before the M 5.3 earthquake has a short-term indicative significance. Some of the aftershocks show the same strike-slip mechanism as the main shock. The compressive stress axis and the tension stress axis rotate clockwise and counterclockwise，respectively.

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备注/Memo

备注/Memo:
收稿日期：2019-02-26 基金项目：内蒙古自治区地震局局长基金（2018ZD02）；中国地震局监测、预测、科研三结合课题（170608） 作者简介：李 娟（1980- ），女，工程师，主要从事地震学预测方法研究。 E-mail：258847674@qq.com.
更新日期/Last Update: 2019-12-06