何金,魏梦怡,昝书林. 2022年9月5日四川泸定MS6.8地震序列时空演化特征[J]. 华北地震科学,2024, 42(3):69-75. doi:10.3969/j.issn.1003−1375.2024.03.010.
引用本文: 何金,魏梦怡,昝书林. 2022年9月5日四川泸定MS6.8地震序列时空演化特征[J]. 华北地震科学,2024, 42(3):69-75. doi:10.3969/j.issn.1003−1375.2024.03.010.
HE Jin,WEI Mengyi,ZAN Shulin. Spatial and Temporal Evolution Characteristics for the Sequence of the Luding Ms6.8 Earthquake on 5th September, 2022 in Sichuan Province[J]. North China Earthquake Sciences,2024, 42(3):69-75. doi:10.3969/j.issn.1003−1375.2024.03.010.
Citation: HE Jin,WEI Mengyi,ZAN Shulin. Spatial and Temporal Evolution Characteristics for the Sequence of the Luding Ms6.8 Earthquake on 5th September, 2022 in Sichuan Province[J]. North China Earthquake Sciences,2024, 42(3):69-75. doi:10.3969/j.issn.1003−1375.2024.03.010.

2022年9月5日四川泸定MS6.8地震序列时空演化特征

Spatial and Temporal Evolution Characteristics for the Sequence of the Luding Ms6.8 Earthquake on 5th September, 2022 in Sichuan Province

  • 摘要: 依据中国地震台网中心提供的2022年9月5日至2023年9月5日期间的地震目录,采用双差定位方法(hypoDD)对2022年9月5日四川省甘孜州泸定MS6.8地震余震进行分时段精定位,分别从时间和空间2个角度来对比分析不同时段的余震时空分布特征。结果显示:地震序列在时序上显示泸定地震为主-余型地震,余震深度随时间逐渐加深,表明该区域构造仍然活跃;在空间上显示泸定地震为双侧破裂且具有共轭断裂,表明鲜水河断裂带两侧介质属性相差不大且该区域的构造应力场复杂;地震序列中早期余震的触发机制为震后余滑模式,后期余震的触发机制为流体扩散模式。

     

    Abstract: Based on the earthquake catalog provided by the China Earthquake Network Center for the period from September 5, 2022 to September 5, 2023, and using the double-difference relocation algorithm, the aftershock sequences of the September 5, 2022 Luding Ms 6.8 earthquake in Ganzi, Sichuan Province are relocated in different time windows. The spatial and temporal distribution characteristics of aftershocks are compared in different intervals of time and space. The results show that: in terms of time, the Luding earthquake is a main-aftershock sequence, and the depth of aftershocks gradually increase with time, indicating that the tectonics of this region is still active. Spatially, the Luding earthquake is bilateral rupture and have conjugate fault, which indicates that the media properties on both sides of the Xianshuihe Fault are not much different and the tectonic stress field in the region is complex. The triggering mechanism for early aftershocks is the afterslip mode, while for late aftershocks is the fluid diffusion mode.

     

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