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南北地震带北段6级以上地震前ML ≥ 3.0地震活动特征
任雪梅,曾宪伟,丁风和,蔡新华
作者单位
任雪梅 宁夏回族自治区地震局, 银川市北京东路244号 750001 
曾宪伟 宁夏回族自治区地震局, 银川市北京东路244号 750001 
丁风和 宁夏回族自治区地震局, 银川市北京东路244号 750001 
蔡新华 宁夏回族自治区地震局, 银川市北京东路244号 750001 
摘要:
对1970年以来南北地震带北段6级以上地震前的ML ≥ 3.0地震活动特征进行了分析,讨论了平静或增强现象的特征,并结合主震震源机制解和区域活动性差异,对6级以上地震的平静现象进行较为深入的分析。结果表明,主震前震中区ML ≥ 3.0地震活动主要存在平静异常,各个区域的平静特征和时间有差异,震中区ML ≥ 3.0地震平静持续时间的长短与其主震前活动水平密切相关。
关键词:  南北地震带北段  前兆性平静  增强  活跃  震中区
DOI:
分类号:P315
基金项目:宁夏回族自治区重点研发计划(科技惠民)项目"内蒙古阿拉善左旗5.8级地震后宁夏北部及邻区地震危险性分析"(2016KJHM135)资助
Activity Characteristics of Weak Earthquakes before M ≥ 6.0 Earthquakes in the Northern Section of the North-South Seismic Belt
Ren Xuemei,Zeng Xianwei,Ding Fenghe,Cai Xinhua
Abstract:
In the northern section of the North-South Seismic Belt since 1970 activity characteristics of earthquakes with ML ≥ 3.0 before M ≥ 6.0 earthquakes are analyzed,and discussed the calm or enhanced characteristics of the phenomenon. On the basis of the main seismic source mechanism and the differences of regional activity,the calm phenomena of M ≥ 6.0 earthquakes are analyzed in depth. The results show that there is clam anomaly of seismic activity of earthquakes in the epicentral area before main shocks. The calm characteristics and time of each region are different. The duration of the calm of earthquakes with ML ≥ 3.0 in the epicentral area before main earthquake was closely related to the activity level before the main earthquake.
Key words:  The north-south seismic zones  Precursory calm  Enhancement  Active  Epicentral area