河西走廊西端文殊山南缘断裂新活动特征
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作者单位:

1.甘肃兰州地球物理国家野外科学观测研究站;2.中国地震局兰州岩土地震研究所

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基金项目:

第二次青藏高原综合科学考察研究(2019QZKK0901)、国家自然科学基金项目(42072246)联合资助


New activity characteristics of the southern Wenshushan fault at the western end of the Hexi Corridor
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Affiliation:

1.Gansu Lanzhou Geophysics National Observation and Research Station,Gansu Lanzhou;2.Lanzhou Institute of Geotechnique and Earthquake,China Earthquake Administration

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    摘要:

    文殊山南缘断裂为新发现的位于河西走廊西端嘉峪关-文殊山隆起带南侧的一条活动断裂,研究其活动特征对完善区域构造图像、认识地区地震危险性具有重要的意义。本文根据遥感影像解译、野外地质调查、航空摄影测量,结合年代学测试,对断裂进行了综合研究。结果表明,文殊山南缘断裂长约25 km,断裂总体走向为NW向,倾向NE。根据断错及未断错地貌测年,确定文殊山南缘断裂最新一次地震活动的时间在0.8±0.1 ka与1887-1725 cal a BP之间。利用高精度DEM数据,获得了断层陡坎高度,结合相应的地貌年代,估算文殊山南缘断裂垂直滑动速率在0.2-0.25 mm/a。根据地震震级与破裂长度、位移量经验公式,估算文殊山南缘断裂潜在发震能力在6.8级左右,此震级下可能对临近的乡镇、嘉峪关市区有较大的影响。

    Abstract:

    The southern Wenshushan fault, which located on the southern side of the Jiayuguan–Wenshushan Uplift in the Hexi Corridor, was a newly discovered active fault. Studying its activity characteristics was of great significance for improving the regional tectonic image and understanding the seismic risk of the region. Based on the remote sensing image interpretation, field geological survey, aerial photogrammetry, and chronological testing, we conducted comprehensive research on the fault. The results showed that the southern Wenshushan fault extended NW for approximately 25 km, dipping NE. According to the dating of faulted and un faulted landforms, the latest seismic activity on the southern Wenshushan fault occurred between 0.8 ± 0.1 ka and 1887-1725 cal a BP. Using high-precision DEM data, the height of the fault scarps wwere obtained, and combined with the corresponding geological age, the vertical slip rate of the fault was estimated to be between 0.2-0.25 mm/a. Based on the empirical formula of between earthquake magnitude and rupture length, and displacement, the potential seismic magnitude of the southern Wenshushan fault was estimated to around 6.8. This magnitude may have a significant impact on nearby towns and Jiayuguan urban area.

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  • 收稿日期:2024-02-22
  • 最后修改日期:2024-04-22
  • 录用日期:2024-05-14
  • 在线发布日期: 2024-05-14