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2013年7月22日岷县MS6.6级地震前后视应力研究
陈丽娟1) 李艳娥2) 杨立明3) 陈继锋3) 陈学忠2) 龚丽文1)
1) 重庆市地震局,重庆 401147;2) 中国地震局地球物理研究所,北京 100081;3)甘肃省地震局,兰州 730000
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ML≥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,结果如下:(1)岷县MS6.6级地震发生前,ML?4.0级地震在震中区没有出现视应力高值分布,而ML≥4.0级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MS6.6级地震  视应力  时空演化特征
DOI:
分类号:
基金项目:
The Study on Apparent Stress before and after the Minxian MS6. 6 Earthquake on July 22,2013
Chen Lijuan1),Li Yane2),Yang Liming3),Chen Jifeng3),Chen Xuezhong2),and Gong Liwen1)
1) Earthquake Administration of Chonqing Municipality,Chongqing 401147,China;2) Institute of Geophysics,CEA,Beijing 100081,China;3) Earthquake Administration of Gansu Province,Lanzhou 730000,China
Abstract:
Based on the waveform data observed by the regional seismic network of Gansu Province, we calculated the apparent stress of 422 earthquakes with ML ≥2. 0 occurring in the surrounding area of the Minxian earthquake from January 2010 to July 2014 and obtained the temporal and spatial variation of apparent stress before and after the Minxian earthquake. Results show that (1) the high value of apparent stress of earthquakes with ML≥4. 0 was concentrated in the epicenter area before the Minxian earthquake while that of earthquakes with ML < 4. 0 was not; (2) Apparent stress around the epicenter area showed an obvious increasing process before the Minxian earthquake and the increasing process has continued after the main shock,which means that this study area is still in the danger of strong earthquakes.
Key words:  The 2013 Minxian MS6.6 earthquake  Apparent stress  Temporal and spatial variation