2022年12月29日吉尔吉斯斯坦M_(S)5.4地震序列及震前地震活动异常分析  

ANALYSIS OF SEISMIC SEQUENCE AND SEISMOLOGICAL ANOMALY BEFORE KYRGYZSTAN M_(S)5.4 EARTHQUAKE ON DECEMBER 29,2022

作　　者：高荣[1,2] 聂晓红 宋春燕[1] 张琳琳[1] 刘萍[1] GAO Rong;NIE Xiao-hong;SONG Chun-yan;ZHANG Lin-lin;LIU Ping(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China;Chengdu University of Technology,Chengdu 610000,Sichuan,China)

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011 [2]成都理工大学,四川成都610000

出　　处：《内陆地震》2025年第1期34-43,共10页Inland Earthquake

基　　金：新疆地震科学基金(202101,202104,202201).

摘　　要：梳理2022年12月29日吉尔吉斯斯坦M_(S)5.4地震构造背景、震源机制解、地震序列特征和震前地震活动性异常,结果如下:①本次地震发生在柯坪块体,发震构造为迈丹断裂的分支断裂阔克萨勒断裂。②震源错动方式为逆冲型,可能是塔里木盆地和天山强烈挤压后发生的一次地震。③此次地震序列类型为主余型,序列余震不丰富,频度和强度衰减较快。④震前存在地震活动性异常5项,震前异常在时间上呈现中等地震的长时间平静→中小地震活动增强→小地震频度显著增加→有序分布→增强活动减弱→发生地震的中期向短期过渡的发震特征;空间上,呈现由大范围向接近震源区小区域收缩的特征,异常在震前的短期表现形式为中、小地震频度的显著增加。This paper summarized the seismotectonic background,focal mechanism solutions,seismic sequence characteristics and seismicity anomalies of M_(S)5.4 Kyrgyzstan earthquake.The results are as follows:①This earthquake occurred in the Keping block,and the seismic structure was the branch fault of the Maidan fault,the Kuokesale fault.②The focal mechanism solutions is thrust type,which may be an earthquake that occurred after strong extrusion in the Tarim Basin and the Tianshan Mountains.③The earthquake sequence type is mainshock-aftershock type,and the sequence aftershocks are not abundant,with a rapid decay in frequency and intensity.④Five seismic activity anomalies existed before the earthquake,namely,the pre-earthquake anomaly showed a long-term calm of medium earthquakes→increased seismic activity→a significant increase in the frequency of small earthquakes→orderly distribution→weakening of enhancement activity→the occurrence of earthquakes,and the seismic characteristics of medium-term transition to short-term.Spatially,it shows the characteristics of shrinkage from a large area to a small area close to the epicenter area,and the short-term performance of the anomaly before the earthquake is a significant increase in the frequency of medium and small earthquakes.

关 键 词：吉尔吉斯斯坦M_(S)5.4地震 序列特征 地震活动性异常 

分 类 号：P315.7[天文地球—地震学]