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2025年西藏定日MS6.8级地震余震序列精定位与地震烈度
徐志双, 文鑫涛, 席楠, 李志强, 段乙好, 李晓丽, 杨理臣, 任静, 董雨溦
PDF(4261 KB)
PDF(4261 KB)
2025年西藏定日MS6.8级地震余震序列精定位与地震烈度
为了解2025年西藏定日M S6.8地震余震序列和地震烈度分布，采用双差定位法对72 h内余震进行重新定位，并对重定位余震进行震级加权的标准差椭圆拟合；同时对震中附近150 km的强震动数据进行处理得到仪器烈度值.精定位余震呈南北向展布，2 h余震分布情况与72 h一致，余震中心和宏观震中均位于震中北向，余震长轴方向与烈度等震线Ⅸ度长轴方向相差5°，余震沿长轴方向展布71 km.震中附近强震台站较少，计算的仪器烈度在烈度等震线Ⅵ度及以上区域只有4个值，其中2个值与宏观烈度相吻合.基于余震空间分布和震源机制解成果，推断定日M S6.8发震断层节面参数为走向181°/倾角51°/滑动角‒81°.地震呈现出明显的上/下盘效应，上盘高烈度区大于下盘，余震主要分布于上盘.
In order to understand the aftershock sequence and intensity distribution of the Dingri M S6.8 earthquake in 2025, the double-difference location method has been utilized to relocate the aftershocks within 72 hours and the standard deviation ellipse weighted by magnitude has been used to analyze the relocated aftershocks. Meanwhile, the instrumental intensities have been calculated with the strong-motion data within 150 km away from the epicenter. The relocated aftershocks are distributed in a north-south direction, and the distribution of aftershocks within 2 hours shows consistence with that of the 72 hours. The aftershock center and macroseismic epicenter are both located to the north of the epicenter, and the major-axis direction of the aftershock area is 5° different from that of the intensity Ⅸ of the isoseismal lines. The distribution length of the aftershocks along the major axis is 71 km. There are few strong motion stations around the epicenter, therefore only 4 calculated intensity values have been obtained in areas of intensity VI and above, 2 of which show agreement with the macroseismic intensities. Based on the spatial distribution of aftershocks and the focal mechanism solution, it is inferred that the nodal parameters of the seismogenic fault of the Dingri M S6.8 earthquake are 181°/51°/‒81° for strike/dip/rake angles. This earthquake shows a significant upper/lower wall effect, with greater high-intensity areas and a concentrated distribution of aftershocks in the upper wall.
余震 / 仪器烈度 / 双差定位 / 震源机制 / 等震线 / 地震 / 灾害.
aftershock / instrumental intensity / double-difference location / focal mechanism / isoseismal line / earthquake / disasters
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感谢西藏日喀则市定日县6.8级地震现场工作队为烈度调查工作的辛苦付出.感谢两位匿名审稿专家和编委会对文章提出宝贵意见.感谢Waldhauser F. 提供双差定位程序.本文利用QGIS和GMT软件绘制图件！
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