摘要
受海南岛北部地区沉积地质条件以及历史仪器记录缺乏的限制,目前对1605年琼州大地震(>7½)发震构造的具体位置和构造特征,缺少较好的露头进行揭示。本研究主要基于自主研发的无人艇单道地震系统,在东寨港陆陷成海区域获取了4条浅层反射剖面数据,对该地震发震断裂的几何结构进行解析,并结合区域内的地质地球物理资料对发震机制开展了综合分析。研究发现1605年琼州大地震的发震断裂总体上是由NEE向马袅‒铺前断裂和NNW向或者近似SN向铺前-清澜断裂两组陡倾角断裂(~80°)组成,其中NEE向断裂是主控断裂,倾向北西,且断裂都为全新世活动断裂,现今仍具有强烈活动性。此外,利用本次探测获得的断裂结构建立的模型结果与实测的震害及烈度特征基本吻合,证明本次的探测结果相对可靠,对于重新评估和认识本次发震过程和机制,以及评估未来海南岛北部地区的地震危险性具有重要意义。
Due to the limitations of sedimentary conditions in the northern part of Hainan Island,the specific location and structural characteristics of the fault that caused the 1605 Qiongzhou Earthquake have not yet been well characterized by outcrops or exploration results.This study primarily used a newly developed single-channel seismic system based on an Unmanned Surface Vessel(USV)to acquire four shallow seismic profiles in the subsided area of Dongzhai Port,and analyzed the detailed structure of the seismogenic fault.Additionally,the study integrates geological and geophysical data from the region to conduct a comprehensive analysis of the seismogenic mechanism and process.The research findings indicate that the seismogenic fault of the 1605 Qiongzhou Earthquake is generally composed of two sets of steeply dipping faults(with a dip angle of approximately 80°)trending Northeast-East(NEE)and Northwest(NW),with the NEE-trending fault being the dominant one,dipping Northwest.Both sets of faults are active and still exhibit strong activity today.Moreover,the model results established based on the fault structures obtained from this exploration are consistent with the observed seismic damage and intensity characteristics,a consistency that validates the accuracy of the exploration results.This study is of great significance for reassessing and further understanding the seismogenic process and mechanism,as well as for accurately evaluating the future seismic hazard in northern Hainan Island.
作者
惠格格
郑江龙
何骁慧
王伟涛
李志刚
李天光
李林伟
林威豪
周庆杰
张培震
HUI Gege;ZHENG Jianglong;HE Xiaohui;WANG Weitao;LI Zhigang;LI Tianguang;LI Linwei;LIN Weihao;ZHOU Qingjie;ZHANG Peizhen(Guangdong Provincial Key Laboratory of Geodynamics and Geological Disasters/School of Earth Sciences and Engineering,Sun Yat-sen University,Zhuhai 519082,Guangdong,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,Guangdong,China;Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,Guangdong,China;First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266100,Shandong,China)
出处
《大地构造与成矿学》
北大核心
2025年第5期1051-1061,共11页
Geotectonica et Metallogenia
基金
南方海洋科学与工程广东省实验室(珠海)项目(SML2021SP318、SML2024SP019、SML2021SP239)
国家重点研发计划项目(2023YFC3008603)
国家自然科学基金项目(42202238)联合资助。
关键词
1605琼州地震
无人艇地震系统
浅地震探测
NEE向断裂
发震断裂
1605 Qiongzhou earthquake
unmanned surface vessel seismic system
shallow seismic exploration
Northeast-East(NEE)-trending fault
seismogenic fault
