2026/10/22 西藏那曲市巴青县MW7.1地震初步破裂模型

Preliminary rupture model of the 22 October 2026 Baqing, Nagqu, Tibet, China MW 7.1 earthquake

概述

据中国地震台网正式测定,2026年10月22日22时33分(UTC+8),西藏那曲市巴青县发生7.0级地震。震中位于93.79°E,32.40°N。

矩张量解采用Xu et al. (2023)的P波与W震相联合反演方法获得,基于AK135一维地球速度结构模型(Kennett et al., 1995),采用QSSP(Wang et al., 2017)计算格林函数。结果显示,本次地震为正断层型地震,两个节面分别为:节面1走向18°、倾角53°、滑动角269°;节面2走向200°、倾角37°、滑动角271°,矩心深度固定为10 km。

结合地表破裂特征,节面2(走向200°、倾角37°)更符合实际断层几何。其反演结果显示,主要滑动集中在震源附近的浅部断层区域,并沿断层走向向两侧扩展,最大滑动量约为1.8 m;震源时间函数在约8 s达到峰值,主要地震矩释放集中在约30 s内。

模型下载: Xznq20261022223339_Rupture_Info.txt

提供者:许月怡 张勇

震源机制

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破裂模型

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参考文献

1. Kennett B., Engdahl E., and Buland R. (1995). Constraints on seismic velocities in the earth from travel times, Geophys. J. Int. 122, 108–124.

2. Wang, R., Heimann, S., Zhang, Y., Wang, H., and Dahm, T. (2017) Complete synthetic seismograms based on a spherical self-gravitating Earth model with an atmosphere-ocean-mantle-core structure, Geophys. J. Int., 210, 1739-1764.

3. Zhang Y., Feng W., Chen Y., Xu L., Li Z., Forrest D. (2012). The 2009 L’Aquila MW 6.3 earthquake: a new technique to locate the hypocentre in the joint inversion of earthquake rupture process, Geophys. J. Int., 191, 1417-1426.

4. Xu, B., Zhang Y. (2023). Joint inversion of centroid moment tensor for large earthquakes by combining teleseismic P-wave and W-phase records[J]. Geophy. J. Int., 234(2): 1143-1156