2013年7月22日岷县MS6.6地震前后视应力研究

地震 ›› 2015, Vol. 35 ›› Issue (4): 30-42.

2013年7月22日岷县M_S6.6地震前后视应力研究

陈丽娟^1,2, 李艳娥¹, 杨立明³, 陈继锋³, 陈学忠¹

1.中国地震局地球物理研究所, 北京 100081;
2.重庆市地震局, 重庆 401147;
3.甘肃省地震局, 甘肃兰州 730000

收稿日期:2014-11-24 出版日期:2015-10-31 发布日期:2020-06-28
作者简介:陈丽娟(1988-), 女, 四川广安人, 在读硕士研究生, 主要从事地震预测等研究。
基金资助:
中国地震局地球物理研究所基本业务专项(DQJB12C06)

Temporal-spatial Variations of Apparent Stress before and after the 22 July 2013 Minxian M_S6.6 Earthquake

CHEN Li-juan¹, LI Yan-e¹, YANG Li-ming², CHEN Ji-feng², CHEN Xue-zhong¹

1. Institute of Geophysics, CEA, Beijing 100081, China;
2. Gansu Earthquake Administration, Lanzhou 730000, China

Received:2014-11-24 Online:2015-10-31 Published:2020-06-28

摘要/Abstract

摘要： 利用甘肃省区域地震台网提供的地震波形资料, 计算甘肃东南地区2010年1月至2014年6月422个M_L≥2.0地震的视应力, 得到了视应力的空间分布图像和视应力随时间的变化, 分析了地震前后视应力时空演化特征。结果表明: ① 岷县M_S6.6地震发生前, M_L<4.0地震在震中区没有出现视应力高值分布, 而M_L≥4.0地震的视应力在震中区出现了视应力高值分布图像。 ② 震中附近地区视应力地震前出现上升过程, 震后这个上升过程仍在继续, 这个地区未来强震危险性仍然存在, 值得关注。

关键词: 2013年岷县M_S6.6地震, 视应力, 时空演化特征

Abstract: Based on waveform data observed by the regional seismic network of Gansu province, we calculated apparent stress of 422 M_L≥2.0 earthquakes occurred in the Minxian earthquake zone and its surrounding area from January 2010 to July 2014, obtained and analyzed temporal-spatial variations of apparent stress before and after Minxian earthquake. The results show that (1) high apparent stress of earthquakes with M_L≥4.0 is concentrated in the epicenter area while that of earthquakes with M_L<4.0 is distributed in the surrounding area before the Minxian earthquake. (2) Apparent stress in the epicenter area show an obvious increasing process before Minxian earthquake and the increasing process has continued after the earthquake, which may suggests that the study area is still in the danger of strong earthquake.

Key words: Apparent stress, Earthquake risk, The 2013 Minxian M_S6.6 earthquake

中图分类号:

P315.7

陈丽娟, 李艳娥, 杨立明, 陈继锋, 陈学忠. 2013年7月22日岷县M_S6.6地震前后视应力研究[J]. 地震, 2015, 35(4): 30-42.

CHEN Li-juan, LI Yan-e, YANG Li-ming, CHEN Ji-feng, CHEN Xue-zhong. Temporal-spatial Variations of Apparent Stress before and after the 22 July 2013 Minxian M_S6.6 Earthquake[J]. EARTHQUAKE, 2015, 35(4): 30-42.

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