1970年以来“固原窗”M_(L)≥3.0地震活动增强现象及震兆意义  

Activity Enhancement Phenomenon and Seismic Significance of Earthquakes with M_(L)≥3.0 in "Guyuan Window" Since 1970

作　　者：任雪梅[1] 李文君 罗国富[1] REN Xuemei;LI Wenjun;LUO Guofu(Earthquake Agency of Ningxia Hui Autonomous Region,Yinchuan 750001,China)

机构地区：[1]宁夏回族自治区地震局,银川750001

出　　处：《华南地震》2022年第3期58-64,共7页South China Journal of Seismology

基　　金：宁夏回族自治区自然科学基金项目“宁夏及邻区5级以上地震的特征和危险性预测研究”(2021AAC03481);宁夏回族自治区自然科学基金项目“2021年固原和灵武地区小震活跃后的区域地震危险性分析”(2022AAC03695)联合资助。

摘　　要：对1970年以来宁夏“固原窗”的M_(L)≥3.0地震活动增强与南北地震带中北段的5级以上地震之间的关系进行了深入剖析,发现1970年以来发生在距离“固原窗”300~500 km范围内的6级以上地震与“固原窗”内M_(L)≥3.0地震活动增强显著相关,其中大部分6级以上地震发生在“固原窗”的M_(L)≥3.0地震活动增强结束1.1年之内,少部分7级以上地震发生在“固原窗”的M_(L)≥3.0地震活动增强之前0.5年,成组的5级地震发生在“固原窗”的M_(L)≥3.0地震活动增强过程中。In this paper,the relationship between the increased seismic activity of earthquakes with M_(L)≥3.0 in"Guyuan window"and the earthquakes with M_(S)≥5.0 in the middle and northern section of the North-South seismic belt since 1970 has been analyzed.It is found that since 1970,earthquakes with M_(S)≥6.0 occurring in the region 300-500 km away from the"Guyuan window"are significantly correlated with the increase of seismic activity with M_(L)≥3.0 in"Guyuan window".Most earthquakes with M_(S)≥6.0 occurred within 1.1 years after the end of seismic activity enhancement of earthquakes with M_(L)≥3.0 in the"Guyuan window",a small number of earthquakes with M_(S)≥7.0 occurred 0.5 years before seismic activity enhancement of earthquakes with M_(L)≥3.0 in the"Guyuan window",a group of M5 earthquakes occurred during seismic activity enhancement of earthquakes with M_(L)≥3.0 in the"Guyuan window".

关 键 词：固原窗 南北地震带中北段 宁夏南部及邻区 地震活动增强 平静 震兆意义 

分 类 号：P315.75[天文地球—地震学]