摘要
2023年12月18日23时59分(北京时间)甘肃积石山发生6.2地震。中国地震局地球物理研究所在震后启动快速响应,组织相关领域研究人员对此次地震的震源参数、震源机制、破裂过程和地震辐射能量等进行了估计,余震序列进行了重定位,基于震源模型进行了震动图模拟、同震形变场模拟。结果表明,此次地震发生在拉脊山东侧,以逆冲机制为主,能量集中在前约8 s内释放;极震区震动烈度可能达Ⅷ度以上,可能的受灾范围近6 000 km~2;此次地震引起了显著的同震位移,最大水平向位移达到7.8 cm、垂直向位移达到15.8 cm。
At 23:59 on December 18,2023(Beijing time),a M6.2 earthquake occurred in the Gansu Province of Jishishan.The Institute of Geophysics,China Earthquake Administration initiated the response mechanism after this earthquake and organized geophysics researchers to estimate the source parameters,focal mechanism,rupture process,earthquake radiation energy and earthquake relocation of this earthquake.Based on the source model,the Shakemap and the coseismic deformation field simulation are carried out.The results demonstrate that the earthquake is of dominant thrusting mechanism.The energy was concentrated and released in the first 8 seconds.The earthquake intensity in the extreme seismic area possibly exceededⅧ,resulting in an estimated disaster range of approximately 6000 km2.This earthquake caused apparent horizontal coseismic displacement with maximum displacements reaching 7.8 cm and 15.8 cm.
作者
郭祥云
韩立波
张旭
张喆
房立华
陈鲲
刘瑞丰
王永哲
Guo Xiangyun;Han Libo;Zhang Xu;Zhang Zhe;Fang Lihua;Chen Kun;Liu Ruifeng;Wang Yongzhe(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)
出处
《地震科学进展》
2024年第1期75-85,共11页
Progress in Earthquake Sciences
基金
国家科技基础资源调查专项(2023FY101502-01)资助。
关键词
震源参数
破裂过程
余震重定位
地震动强度预测
地震辐射能量
同震形变场
source parameters
rupture process
earthquake relocation
Shakemap prediction
earthquake radiation energy
coseismic deformation
