川滇藏交界地区M≥7地震记载的起始年代与资料完整性分析  

THE ANALYSIS OF THE STARTING YEAR AND THE COM-PLETENESS OF SEISMIC RECORDS FOR EARTHQUAKES WITH MAGNITUDES M≥7 IN THE BORDER REGION OF SICHUAN,YUNNAN AND TIBET

作　　者：周介元 周庆[1] 冉洪流[1] ZHOU Jie-yuan;ZHOU Qing;RAN Hong-liu(Institute of Geology,China Earthquake Administration,Beijing 100029,China)

机构地区：[1]中国地震局地质研究所,北京100029

出　　处：《地震地质》2023年第4期914-935,共22页Seismology and Geology

基　　金：国家重点研发计划项目(2021YFC3000605)。

摘　　要：地震资料是地震活动性分析、地震危险性分析及地震预测等研究的基础数据。川滇藏交界地区是中国地震活动强烈的地区之一,分析该地区地震资料的完整性有助于进行相关断层的危险性评价及区域地震活动趋势分析。文中通过查阅川滇藏交界地区44个县的地方志,了解各县的建制沿革,由川滇进藏通道的演化明确了川滇藏交界地区的关键交通枢纽与节点,结合历史地震目录、地震史料及前人对该地区地震资料完整性的研究成果,综合分析了鲜水河地区与三江并流区7级以上强震不会被漏记的可靠年代及6级以上地震应被记载的起始年代。同时,根据历史地震等烈度线长、短轴数据拟合得到的川滇菱形块体烈度衰减关系,在空间上分析6、7级地震的影响范围。结果表明,1719-1736年为鲜水河地区M_(S)≥7地震资料完整的起始年代,1719-1728年为三江并流区M_(S)≥7地震资料完整的可能起始年代,上述年代同样可以作为2个地区6级以上地震应记载的起始年代。Earthquake catalog is the foundational data for analyzing seismic activity,assessing seismic hazard,and studying earthquake prediction.The majority of historical earthquake records are sourced from historical documents,with a significant portion of these records found in local gazetteers.Compiling historical literature is an essential way in analyzing seismic activity because historical accounts of earthquakes often provide more detailed and accurate information than geological data.Among these sources,analyzing relevant content in local gazetteers,such as the historical development of local governance,military garrison,official records,and descriptions of disasters and auspicious events,plays a crucial role in seismic activity research.This article aims to acquire historical earthquake records by consulting local gazetteers,folk books,and other historical sources containing natural,social,and political records.These records serve as historical foundations for analyzing the completeness of seismic data records.The border region between Sichuan,Yunnan,and Tibet is located in the northwest secondary block of the Sichuan-Yunnan block,which is one of the areas with frequent strong earthquakes in China.The Xianshuihe fault zone and the Jinshajiang fault zone are the northeastern and northwestern boundary faults of the Sichuan-Yunnan block,respectively.They are large-scale and highly active fault zones formed due to the eastward escape of the Tibetan plateau caused by the relative movement between the Indian and Eurasian plates.Previous studies on active tectonics have shown that major earthquakes with magnitudes of 8 and above,as well as over 80%of strong earthquakes with magnitudes of 7,mainly occur in the boundary zones of active blocks with intense structural deformation and high stress accumulation.Moreover,the known active faults in the study area,such as the Batang fault and Litang fault,are also major faults that significantly have influence on the occurrence strong earthquakes.The Sichuan-Yunnan-Tibet adjacent

关 键 词：地震资料 完整性分析 川滇藏交界地区 

分 类 号：P315.5[天文地球—地震学] P316[天文地球—固体地球物理学]