大柴旦断裂中段晚第四纪活动特征
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作者单位:

1.中国地震局第二监测中心;2.中国地震局兰州地震研究所;3.北京震防科技发民有限公司

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基金项目:

国家自然科学基金(41802229)、中国地震局星火科技项目(XH20080Y)共同资助第一


Late Quaternary activity characteristics of the middle segmentof the Dachaidan fault
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Affiliation:

1.The Second Monitoring and Application Center,China Earthquake Administration;2.Lanzhou Institute of Seismology,China Earthquake Administration;3.Beijing Earthquake Prevention Technology Development Co, Ltd.

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    摘要:

    通过航卫片遥感数据解译、野外地质地貌调查,并结合差分GPS等测量手段,获取了大柴旦断裂晚第四纪以来的地质地貌特征。结果显示:大柴旦断裂晚第四纪以来以右旋逆冲活动为主,逆冲量和右旋量在不同地貌面上是不同的,显示出了明显的多期次活动特征,可能为特征地震原地复发。野外天然古地震剖面揭示了2次古地震事件,分别发生在(3907.5±72.5)a.B.P之前与(2402.5±57.5)a.B.P之后,复发周期约为1500年,表明该断裂在全新世活动强烈,与该区域近年来频繁的强震活动相吻合。

    Abstract:

    The geological and geomorphological characteristics of the Dachaidan fault since late Quaternary are obtained, by means of interpretation of remote sensing data, field investigation, and differential GPS survey. The results show that the Dachaidan fault has been dominated by dextral thrust since late Quaternary. Measurement result is different in different geomorphic planes, showing obvious characteristics of multi-stage activity, which may be the recurrence of characteristic earthquakes in situ. Two paleoseismic events occurred before (3907.5 ± 72.5) a.B.P. and after (2402.5 ± 57.5) a.B.P., respectively. The recurrence period is about 1500 years, which indicates that the fault was strongly active in the Holocene, which is consistent with the frequent strong earthquake activities in the region in recent years.

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  • 收稿日期:2021-07-20
  • 最后修改日期:2021-11-17
  • 录用日期:2022-03-11
  • 在线发布日期: 2022-11-13
地质灾害机理与防治新技术”专栏征稿通知
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