摘要
本文以2017年4月25日宁夏海原ML4.0级震群事件为例,具体分析了该震群异常的时空发展,以及随时间起伏变化特征。从传统地震学方法角度判断震群性质,又从数字地震学角度分析震群的震源机制解、视应力和地震调整比,最后从震例回溯角度分析了宁夏南部ML4.0级以上震群事件,一般在较短时间内在祁连山地震带的中东段较好地对应中强以上地震,这样的映震意义为今后判断宁夏南部的震群异常提供了适用的参考依据。
This paper takes the ML4.0 earthquake group event in Haiyuan,Ningxia Hui Autonomous Region on April 25,2017 as an example to analyze the spatial and temporal development and fluctuation characteristics of the earthquake group.On the one hand,the characteristics of earthquake group are analyzed from the perspective of traditional seismology.On the other hand,the source mechanism solution,apparent stress and seismic adjustment ratio of earthquake group are analyzed from the perspective of digital seismology.Finally,the earthquake group events were analyzed from the aspect of case summary.There is a certain correspondence between the south Ningxia earthquake group and the mid-strong earthquakes in Qilian mountain seismic belt.This conclusion provides a valuable reference for the future analysis of seismic group anomalies in southern Ningxia.
基金
宁夏回族自治区科技厅自然科学基金项目(NZ17222)。
