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2013年岷县漳县6.6级地震前地震b值异常特征研究
冯建刚1) 张辉1) 杨萍1,2)
1) 中国地震局兰州地震研究所,甘肃兰州 730000;2) 新疆维吾尔自治区地震局,新疆乌鲁木齐 830011
摘要:
本文利用1990年以来的甘肃测震台网资料,计算获得2013年岷县漳县6.6级地震前邻区地震b值和Δb值的空间图像。结果表明,该6.6级地震发生在甘东南地区显著低b值异常区域的边缘,且震前邻区地震Δb值异常显著。从岷县漳县6.6级地震与低b值空间分布关系来看,该地震的发生并未降低该区域的强震危险性。
关键词:  地震b值  地震危险性  2013年岷县漳县6.6级地震
DOI:
分类号:
基金项目:
Analysis on b-value Abnormality of the Minxian-Zhangxian,Gansu MS6.6 Earthquake
Feng Jiangang1 ),Zhang Hui1 ),and Yang Ping1,2 )
1) Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,China;2) Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,China
Abstract:
In this paper,based on Gansu Digital Seismic Network data since 1990,we calculated b-value and ⊿ b-value of the neighborhood area before the 2013 Minxian-Zhangxian MS6. 6,earthquake. The results show that the earthquake occurred at the margin of the significantly lower b-value area in southeast of Gansu and before the earthquake the neighborhood area had an obviously abnormal ⊿ b-value. From the earthquake and the spatial distribution of low b-value,the region still has the possibility of generating dangerous strong earthquakes.
Key words:  Minxian-Zhangxian earthquake b-value  Southeastern  Gansu