辽宁地区主要断裂活动性和地震危险性评估  

Activity and Seismic Risk Assessment of Main Faults in Liaoning Area

作　　者：曹凤娟[1] 贾丽华[1] 李梦莹[1] 王松阳 Cao Fengjuan;Jia Lihua;Li Mengying;Wang Songyang(Seismological Bureau of Liaoning Province,Shenyang 110034,China)

机构地区：[1]辽宁省地震局,沈阳110034

出　　处：《吉林大学学报（地球科学版）》2021年第1期286-295,共10页Journal of Jilin University：Earth Science Edition

基　　金：辽宁省社会攻关及产业化项目(2017231013);中国地震局地震预测研究所基本科研业务费专项(2018IEF010203)。

摘　　要：基于辽宁地区主要活动断裂的几何特征和空间展布,对1980年以来辽宁地区ML≥2.0地震的累计频次和1900年以来Ms≥5.0地震的年发生率的空间分布及其与活动断裂构造背景关系进行研究,获得了基于地震学的辽宁省内主要断裂和构造区(带)的活动性与地震危险性的初步评估结果。辽宁地区主要断裂活动性较高的有海城河断裂、金州断裂九寨—盖州北段、朝阳—北票断裂等;辽宁地区未来3年发生Ms≥5.0地震危险性较高的断裂依次有海城河断裂、金州断裂、熊岳—庄河断裂、鸭绿江断裂及赤峰—开原断裂与柳河断裂交汇处等。在判定区域地震危险性和城市地震风险时,除了依据前兆异常的空间分布,还应充分考虑区内主要构造(断裂)的活动性与地震危险性。Based on the geometric features and spatial distribution of the major active faults in Liaoning Province, the earthquakes with frequency of M_L≥2.0 in Liaoning since 1980 and the earthquakes with annual occurrence rate of M_s≥5.0 since 1900 were studied,their relationship with the tectonic settings of the active faults were analyzed, and the preliminary evaluation results of the seismicity and seismic risk of the main faults and tectonic zones were obtained. The main tectonic faults with high activity are Haicheng River fault, Jiuzhai-Gaizhou north section of Jinzhou fault, Chaoyang-Beipiao fault, etc.;the faults with relatively high risk of M_s≥5.0 earthquake in the next 3 years are Haicheng River fault, Xiongyue fault, Jiuzhai-Zhuanghe fault, Yalu River fault, the intersection of Chifeng-Kaiyuan fault, and Liuhe fault, etc. It is suggested that not only the spatial distribution of the precursory anomalies, but also the activity and seismic risk of the main structures in the region should be fully considered in the regional earthquake risk and hazard assessment.

关 键 词：活动断裂 地震频次 空间分布 危险性评估 辽宁地区 

分 类 号：P315[天文地球—地震学]