【摘要】 2019年10月12日,广西北流—广东化州交界发生M_S5.2地震,选取广西北流—广东化州区域2010年1月1日—2019年12月31日M_L≥2.0地震目录,对震前地震活动性参数进行时空扫描,并进行地震空区分析,发现部分地震活动性参数异常,且震前存在孕震空区。分析结果如下:震前b值时间扫描曲线长期位于均值线之上,持续时间一年以上;b、C、D值空间扫描均存在异常,其中震前b值异常范围为1.0—2.0,C值异常范围为0.04—0.32,D值异常范围为0.01—0.09;2016年4月至2019年9月,震中附近出现孕震空区,后在空区边缘发生此次M_S5.2地震。更多还原

【Abstract】 An M_S 5.2 earthquake occurred at the border of Beiliu in Guangxi Province and Huazhou in Guangdong Province on October 12,2019.The M_L≥2.0 earthquake catalog of Guangxi Beiliu-Guangdong Huazhou from January 1,2010 to December 31,2019,was selected to carry out spatio-temporal scanning of seismicity parameters before the earthquake and conduct a seismic gap analysis.Some seismicity anomalies were found and there were seismogenic gaps before the earthquake.The analysis results are as follows:the time scan curve of b-value before the earthquake is above the mean value for a long time,lasting for more than one year;There were anomalies in the spatial scanning of b,C and D values.Before the earthquake,the abnormal ranges of b-value,C-value and D-value were 1.0–2.0,0.04–0.32 and 0.01–0.09,respectively.From April 2016 to September 2019,there was a seismogenic gap near the epicenter and the M_S 5.2 earthquake occurred at the edge of the gap.更多还原