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2017年九寨沟7.0级地震前不同级别地震空区的演化过程分析
张博, 张辉, 冯建刚, 王朋涛
甘肃省地震局, 兰州市东岗西路450号 730000
摘要:
结合传统地震学方法与数字地震学方法,回顾总结了日常分析预报中针对九寨沟7.0级地震开展的相关工作,梳理总结了地震前提出的甘东南地震异常信息,进一步讨论了九寨沟地震前中期、短期及临震异常特征。通过分析九寨沟7.0级地震之前区域范围内不同震级活动图像,发现甘青川交界地区5级空区在震前向震中一侧收缩、4级地震超长平静458天、3级空区在震前4天被打破的现象,同时发现,震中附近区域震源机制一致性较高,反映了震源区的高应力水平。
关键词:  九寨沟7.0级地震  地震平静  地震空区  震源机制一致性
DOI:
分类号:P315
基金项目:中国地震局兰州地震研究所地震科技发展基金项目(2012Y04)、2018年度震情跟踪定向工作任务(2018010115)共同资助
Analysis of Seismicity Characteristics of the Jiuzhangou MS7.0 Earthquake on August 8,2017
Zhang Bo, Zhang Hui, Feng Jiangang, Wang Pengtao
Gansu Earthquake Agency, Lanzhou 730000, China
Abstract:
This article integrates traditional seismological methods with digital seismological methods,reviews and summarizes the work of the Jiuzhaigou MS7.0 earthquake in our daily analysis and forecast work. The anomalous information is summarized before the earthquake in southeast Gansu. Some mid-and short-term and impending earthquake anomalies related to the occurrence of this earthquake are also combed. The seismic activity images of different magnitudes in the area before the Jiuzhaigou MS7.0 earthquake are analyzed. It is found that the MS5.0 seismic quiescence in the western region of China is contracted to the epicenter before the earthquake. The super long calm time of the ML4.0 seismic quiescence reaches 458 days and the ML3.0 seismic gap is broken in 4 days before the earthquake. At the same time,the focal mechanism in the vicinity of the epicenter is highly consistent,which reflects the high stress level in the focal region. The research work does not only explore the potentially regular occurrence of this earthquake,but also provides a more valuable experience and methods of reference.
Key words:  Jiuzhaigou MS7.0 earthquake  Seismic quiescence  Seismic gap  Consistency of focal mechanism