2025年1月7日西藏定日地震地表破裂特征和野外同震位移测量初步结果

doi:10.3799/dqkx.2025.040

2025年1月7日西藏定日地震地表破裂特征和野外同震位移测量初步结果

doi: 10.3799/dqkx.2025.040

1. 天津大学地球系统科学学院, 天津 300072;
2. 中国地震局第二监测中心, 陕西西安 710054;
3. 中国地震局地震研究所, 武汉 430071

基金项目:

国家自然科学基金项目（No.42272242，4241001018）

详细信息

作者简介:
邵延秀（1984-），副教授，主要从事活动构造和构造地貌研究.Email:shaoyx@tju.edu.cn

通讯作者:
刘静（1969-），教授，主要从事活动构造、地震地质、古地震与构造地貌学研究.Email:liu_zeng@tju.edu.cn

中图分类号: P315
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出版历程
- 收稿日期: 2025-02-06
- 网络出版日期: 2025-03-05

Preliminary Investigation on Surface Rupture and Coseismic Displacement of the January 7, 2025 Dingri Earthquake in Xizang

1. School of Earth System Science, Tianjin University, Tianjin 300072, China;
2. The Second Monitoring and Application Center, China Earthquake Administration, Xi'an 710054, China;
3. Institute of Seismology, China Earthquake Administration, Wuhan 430071, China

摘要

摘要: 2025年1月7日在西藏日喀则地区定日县境内发生Ms6.8地震，地震发生后，我们立即对发震构造和地表破裂开展了野外调查和高精度无人机航测。基于野外地震破裂带调查和遥感数据初步解译，我们发现定日地震发震断裂为登么错（又称丁木错）断裂，并破裂了该断裂的中北段，最北到羊姆丁错姆湖的东岸，最南到朋曲河北岸，地表破裂长度约36.5 km。该地震的地表破裂基本沿着先存断裂分布；在破裂南端，多条平行断裂上出现地表陡坎，最大破裂宽度~4 km。地表破裂样式复杂多样，主要形成不同高度和宽度的地震陡坎和拉张裂缝的组合，且破裂带的北段陡坎较大，最大垂直位移265 ± 27 cm，陡坎高度沿走向变化较大，在两端仅为垂直位移不明显的张裂隙。本研究初步获得地表破裂长度和最大位移等参数与全球正断型地震的矩震级-地表破裂参数经验关系的平均值较为一致。同时，定日地震的地表破裂特征也为研究单次地震陡坎与长期累积陡坎的地貌演化过程研究提供了难得的数据。
- 定日地震 /
- 登么错断裂 /
- 地震地表破裂 /
- 同震位移 /
- 破裂长度
Abstract: On January 7, 2025, a Ms6.8 earthquake struck Dingri County in the Shigatse region of Tibet. In response to the event, we conducted field investigations and high-precision UAV aerial surveys, which indicated that the rupture extended from the central-northern segment of the Dengme Co (or Dingmu Co) fault to the eastern shore of Yangmudingcuomu Lake and the northern bank of the Pengqu River, totaling approximately 36.5 km. The surface rupture predominantly followed existing fault structures, with the southern end exhibiting multiple parallel faults and surface scarps up to 4 km wide. The rupture patterns were complex, combining seismic scarps and extensional fissures of varying dimensions. Notably, the northern section displayed larger scarps, with maximum displacements reaching approximately 265 ± 27 cm. Scarp heights varied significantly along the rupture, with minimal vertical displacement at north and south end. Our preliminary findings suggest that the surface rupture length and maximum displacement align closely with global empirical relationships between earthquake magnitude and rupture characteristics. Additionally, the characteristics of the Dingri earthquake's surface rupture offer valuable insights for studying the geomorphic evolution of single-event seismic scarps and their long-term cumulative effects.
- Dingri earthquake /
- Dengme Co fault /
- Seismic surface rupture /
- Coseismic displacement /
- Rupture length

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