2023年甘肃积石山M_(W)6.0地震震源特征与灾害机理  

Source characteristics and disaster mechanisms of the 2023 Gansu Jishishan M_(W)6.0 Earthquake

作　　者：华思博 徐晨雨 周江诚 徐贝贝 冯万鹏 张勇[1] 房立华[4] HUA SiBo;XU ChenYu;ZHOU JiangCheng;XU BeiBei;FENG WanPeng;ZHANG Yong;FANG LiHua(School of Earth and Space Sciences,Peking University,Beijing 100871,China;Guangdong Provincial Key Laboratory of Geodynamics and Geohazards,School of Earth Science and Engineering,Sun Yat sen University,Zhuhai Guangdong 519000,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai Guangdong 519000,China;Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]广东省地球动力作用与地质灾害重点实验室,中山大学地球科学与工程学院,广东珠海519000 [3]南方海洋科学与工程广东省实验室(珠海),广东珠海519000 [4]中国地震局地球物理研究所,北京100081

出　　处：《地球物理学报》2024年第7期2625-2636,共12页Chinese Journal of Geophysics

基　　金：国家重点研发专项(2022YFF0800603);国家自然科学基金(42074058)资助。

摘　　要：2023年12月18日发生的甘肃积石山M_(S)6.2(M_(W)6.0)地震是一次导致较大伤亡的小规模逆冲型强震(M≥6)事件.我们在破裂过程快速反演后,开展了地震矩张量和破裂过程联合反演,比较分析了此次地震的发震断层参数;在此基础上,测定了地震的辐射能,确定了较宽频带范围内的震源特征,据此讨论了与震源过程相关的灾害机理.结果显示,本次地震断层东倾的可能性更大,主要破裂区域位于积石山县与大河家镇之间,空间上与烈度分布显示的极震区位置较为一致.地震的上盘效应,破裂朝西北及浅处扩展的多普勒效应,以及容易在浅土层中放大的高频地震波辐射,可能是此次地震震害严重的主要震源因素.The Jishishan M_(S)6.2(M_(W)6.0)Earthquake occurred on December 18th,2023 in Gansu province was a small-scale thrust strong event(M≥6)that caused significant casualties.After rapid inversion of rupture process,we performed joint inversions of seismic moment tensor and rupture process,and then compared and analyzed the fault parameters of this earthquake.On this basis,we discussed the disaster mechanisms related to the source process by determining the radiated seismic energy,and obtained the source characteristics within a broad frequency band.The results show that the earthquake fault is more likely to dip to the east.The major rupture area is located between Jishishan County and Dahejia Town,spatially consistent with the meizoseismal area indicated by the intensity distributions.The hanging wall effect,the Doppler effect of the rupture extending towards the northwest and shallower areas,and the amplification of high-frequency waves in shallow soil layers are likely the main source factors for the severe earthquake damage.

关 键 词：2023年甘肃积石山M_(W)6.0地震 断层参数 破裂过程 辐射能 灾害机理 

分 类 号：P315[天文地球—地震学]