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地震 ›› 2023, Vol. 43 ›› Issue (1): 65-73.doi: 10.12196/j.issn.1000-3274.2023.01.006

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2021年西藏双湖MS5.8地震地表破裂及地震烈度初析

张军龙1,2, 贡秋卓玛2, 次仁多吉2, 索朗南杰2, 张建龙2, 孙国涛2, 司金罗布2   

  1. 1.中国地震局地震预测研究所, 北京 100036;
    2.西藏自治区地震局, 西藏 拉萨 850000
  • 收稿日期:2022-11-07 修回日期:2022-12-27 出版日期:2023-01-31 发布日期:2023-05-15
  • 通讯作者: 司金罗布, 高级工程师。 E-mail: sjlb9911@163.com
  • 作者简介:张军龙(1973-), 男, 山西阳城人, 研究员, 主要从事活动构造与地震地质研究。
  • 基金资助:
    国家自然基金项目(41372215, 41872223)

Preliminary Analysis of Surface Rupture and Seismic Intensity of the 2021 MS5.8 Shuanghu Earthquake in Qinghai-Tibet Plateau

ZHANG Jun-long1,2, GONQIU Zhou-ma2, CIREN Duo-ji2, SUOLANG Nanjie2, ZHANG Jian-long2, SUN Gou-tao2, SIJIN Lou-bu2   

  1. 1. Institute of Earthquake Forecasting, CEA, Beijing 100036, China;
    2. Earthquake Administration of Tibet Autonomous Region, CEA, Lhasa 850000, China
  • Received:2022-11-07 Revised:2022-12-27 Online:2023-01-31 Published:2023-05-15

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摘要： 2021年西藏双湖MS5.8地震地表破裂和烈度参数提供了稀有震例, 对中弱地震的地震灾害评价和灾后重建具有重要意义。 野外调查发现, 2021年11月30日西藏双湖5.8级地震的宏观震中位于双湖县措折罗玛镇申亚扎地村附近, 此次地震的震中烈度可达Ⅶ度。 其宏观震中位置、 极震区范围、 主要余震分布等都受到断裂控制。 地表破裂和震源机制解结果相吻合, 表明地震的直接成因是藏中近东西向伸展变形作用诱发吴如错盆地边界断裂发生正断层活动。 这次地震产生了清晰的地表破裂, 对于研究震级和破裂长度之间的关系具有重要意义。

关键词: 青藏高原, 吴如错, 地震烈度, 发震构造

Abstract: Field survey showed and steitistics that the macroscopic epicenter of November 30, 2021 MS5.8 Shuanghu earthquake is located near Shenyazadi Village. The maximum intensity of the Shuanghu earthquake could reach Ⅶ degree. Its macroscopic epicenter location, maximum intensity range, major aftershock distribution, etc. are controlled by the fault activity. The surface rupture and seismic mechanism are consistent, which consistently indicates that Wuru cuo fault is the seismic structure.This earthquake produced some clear surface ruptures, which is of great significance for further study of the relationship between magnitude and rupture length.

Key words: Qinghai-Tibet Plateau, Wuru cuo, Earthquake intensity, Seismic structure

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