2022年12月29日吉尔吉斯斯坦M_(S)5.4地震前地球物理观测中短期异常特征分析  

ANALYSIS ON MEDIUM AND SHORT-TERM ANOMALY CHARACTERISTICS OF GEOPHYSICIAL OBSERVATIONS BEFORE KYRGYZSTAN M_(S)5.4 EARTHQUAKE ON DECEMBER 29,2022

作　　者：梁卉[1] 赵彬彬[1] 艾萨·伊斯马伊力 高歌[1] 颜龙[1] LIANG Hui;ZHAO Bin-bin;Aisa Yisimayili;GAO Ge;YAN Long(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011

出　　处：《内陆地震》2023年第3期264-271,共8页Inland Earthquake

基　　金：中国地震局监测、预报、科研三结合项目(3JH-202301023);新疆地震科学基金(202301);新疆维吾尔自治区自然科学基金(2022D01A106);地震科技星火计划青年项目(XH23046YA);中国地震局震情跟踪课题(2023010415);新疆地震科学基金(202205);新疆地震科学基金(202201).

摘　　要：针对2022年12月29日吉尔吉斯斯坦M_(S)5.4地震,对震前地球物理观测中短期异常和时空演化过程进行分析。研究表明,震前地球物理定点观测异常数量不多,但存在一定数量的电磁异常,可能与地震大小和震源区构造的走滑性质有关。震前异常数量出现阶段性变化,异常数量存在增加过程。异常时空演化存在3个阶段的不同变化过程:第1阶段表现为近源区的前兆异常向外扩展;第2阶段表现为大范围出现异常;第3阶段表现为异常向震中收缩靠近。研究地震孕育过程中前兆异常的时空演化特征,特别是异常的收缩或扩散现象,对地震的危险地区和时间预测具有一定指导意义。For the M_(S) 5.4 earthquake in Kyrgyzstan on December 29,2022,the medium and short-term anomalies in geophysical observations before the earthquake were sorted out and their temporal and spatial evolution processes were analyzed.The research shows that the number of geophysical fixed-point observation anomalies before the earthquake is small,but there are a certain number of electromagnetic anomalies,which may be related to the size of the earthquake and the strike slip nature of the structure in the source area.There are periodic changes in the number of anomalies before the earthquake,and there is an increase in the number of anomalies.There are three different stages of anomalous temporal and spatial evolution,namely the first stage,where the precursor anomaly in the near source area expands outward;In the second stage,anomalies appeared on a large scale;The third stage showed an abnormal contraction towards the epicenter.Studying the temporal and spatial evolution characteristics of precursor anomalies during the process of earthquake preparation,especially the phenomenon of abnormal contraction or diffusion,has certain guiding significance for predicting dangerous areas and time of earthquakes.

关 键 词：吉尔吉斯斯坦 M_(S)5.4地震 异常特征 时空演化 

分 类 号：P315.9[天文地球—地震学]