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2025年1月7日西藏定日MS6.8地震震源破裂过程及余震分布特征
戴宗辉, 高锦瑞, 王鹏, 安艳茹, 许亮, 李冬梅, 李翠芹, 徐长朋, 土登次仁
PDF(5249 KB)
PDF(5249 KB)
2025年1月7日西藏定日MS6.8地震震源破裂过程及余震分布特征
为了解西藏定日M S6.8地震的破裂机制，利用远震波形反演了主震的破裂过程并采用双差定位方法对地震序列进行了精定位.研究结果显示，主震破裂过程持续约22 s，破裂面沿发震断层向北单侧扩展，破裂长度约60 km，在主震以北约30 km附近，最大滑移量2.4 m并在地表形成同震破裂带，与野外地质调查结果相吻合.余震序列呈南北分带特征，可大致划分为三个余震丛集区，其中，南部和中部丛集区的地震分布表明发震断层较为复杂，揭示了多条次级断裂的联动活动.早期余震集中分布于主破裂区外围的低滑移区，与高滑移区（>1.5 m）形成空间互补，符合“应力阴影”效应；后期余震向南迁移，并形成NE-SW与NW-SE向共轭集中区，揭示震后的多向应力调整过程.结果表明，区域构造应力场对地震破裂过程具有显著控制作用，余震分布与主震破裂后的应力调整过程和区域构造密切相关.
To investigate the rupture mechanism of the M S6.8 earthquake in Dingri, Xizang, it inverted the rupture process of the mainshock using teleseismic waveforms and refined the hypocenter locations of the aftershock sequence through the double-difference relocation method. The results indicate that the rupture process lasted approximately 22 seconds, with unilateral propagation northward along the causative fault.The rupture extended for about 60 km, and the maximum slip reached 2.4 m, located roughly 30 km north of the mainshock, forming a co-seismic surface rupture zone that is consistent with the results of field geological surveys. The aftershock sequence exhibits a characteristic north-south distribution, which can be roughly categorized into three clusters. The earthquake distribution in the southern and central clusters indicates a complex fault structure and suggests the co-seismic activation of multiple secondary faults. Early aftershocks are concentrated in the low-slip regions at the periphery of the main rupture zone, complementing the high-slip areas (>1.5 m), consistent with the “stress shadow” effect. Subsequent aftershocks migrated southward and formed conjugate clusters trending NE-SW and NW-SE, revealing a multi-directional stress adjustment process in the post-seismic stage. These findings suggest that the regional tectonic stress field plays a significant role in controlling the rupture process, and that the aftershock distribution is closely related to post-rupture stress redistribution and regional tectonics.
西藏定日地震 / 破裂过程 / 精定位 / 发震构造 / 地震 / 构造地质.
the M S6.8 earthquake in Dingri, Xizang / rupture process / precise location / seismogenic structure / earthquakes / structural geology
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两位评审专家对本文提出的中肯意见和建议极大提升了文章质量，本文使用的远震波形数据来自地震学联合研究院（Incorporated Research Institution for Seismology，IRIS）数据中心，震源破裂过程反演使用了北京大学张勇教授提供的Ruptel 2.1程序（Zhang et al.， 2012），在文章修改过程中，中国地震台网中心杨志高博士、山东省地震局郑建常研究员提出了宝贵建议，在此一并表示感谢！
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