2024年乌什MS7.1地震地质灾害特征初步调查
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P315

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地震科技星火计划(XH24048YA、XH23045YC)资助


Preliminary Survey on Geological Hazard Characteristics of the 2024 Wushi MS7.1 Earthquake
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    摘要:

    2024年1月23日新疆乌什县境内发生 MS7.1 地震,该地震是1992年吉尔吉斯斯坦 MS7.3 地震以来天山地震带内发生的最大地震。震后第一时间的现场调查表明,此次地震所引发的地质灾害主要集中在震中东西两侧约30km的范围内,且总体沿构造线方向分布,其中规模最大的地质灾害点位于震中以南约3km的别迭里沟内。震区北侧的中高山区属于强烈的构造隆升区,险峻的地形为地质灾害的诱发提供了极大的势能条件,此次地震所引发的地质灾害点几乎全部位于中高山区。此次地震造成的地质灾害主要类型为崩塌、地裂缝、砂土液化、地震地表破裂带,由于岩土体松散的结构以及地形等条件的约束,崩塌是本次地震所引发的最多的地质灾害类型。本次调查的河谷内普遍发育1~3级不连续的堆积阶地,由于其松散的结构以及陡立坡面,在Ⅷ~Ⅸ度区内因阶地边坡失稳发生崩塌的现象最为普遍。

    Abstract:

    On January 23,2024,an MS7.1 earthquake struck Wushi County,Xinjiang. This event was the largest earthquake to occur within the Tianshan seismic belt since the 1992 MS7.3 Kyrgyzstan earthquake. Immediate post-earthquake field investigations revealed that the geological hazards triggered by this event were mainly concentrated within approximately 30km to the east and west of the epicenter and were generally distributed along the regional structural lineaments. the largest geological hazard site was located in Biedieli Gully,about 3km south of the epicenter. the medium-to high-mountain area to the north of the affected region belongs to a zone of intense tectonic uplift. Its steep topography provided substantial potential energy for the development of geological hazards,and nearly all hazard sites triggered by this earthquake were located within this medium-to high-mountainous area. the main types of earthquake-induced geological hazards included rockfalls(collapses),ground fissures,sand liquefaction,and earthquake surface rupture zones. Owing to the loose structure of the rock and soil masses,together with topographic constraints,rockfalls were the most widespread type of geological hazard triggered by the earthquake. the surveyed valleys commonly contain discontinuous accumulation terraces of levels 1 to 3. Because of their loose material composition and steep slopes,slope instability and rockfalls along the edges of these terraces were especially widespread within the intensity Ⅷ~Ⅸ zones.

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马建,赵鹏翔,黄高风,黄帅堂.2024年乌什MS7.1地震地质灾害特征初步调查[J].中国地震,2026,42(1):136-148

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  • 收稿日期:2024-10-12
  • 最后修改日期:2025-05-11
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  • 在线发布日期: 2026-05-28
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