| 广州礌岗断裂的晚第四纪活动证据 |
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| 关键词:Zhujiang river delta fault basin Leigang Fault fault activity Late Pleistocene |
| 基金项目:本文由城市活断层探测与地震危险性评价项目“礌岗断裂稳定性及其对佛山市南海区城市建设的影响评价项目”(编号：NHZJ20170419G0334)和中国地震局地球物理研究所自主立项“重大工程项目地震安全性评价中隐伏活动断裂研究”(编号：JY2023Z18)联合资助。 |
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| Evidence of Late Quaternary Activity of the Leigang Fault in Guangzhou |
| The Leigang Fault is a branch of the southern section of the Guangzhou–Conghua fault zone, which is located in the center of the Pearl River Delta fault basin, a special tectonic position where several groups of NE- and NW-trending structures meet. Existing evidence shows that most of the NW-trending faults in the Pearl River Delta fault basin are Late Pleistocene active faults, and whether the conjugate NE-trending faults have been active since the Late Pleistocene has become a scientific problem to correctly elucidate the Late Quaternary tectonic activity pattern and dynamic environment in the region and also affects the scientific assessment of seismic risk in the Pearl River Delta. During the exploration of the Leigang Fault in Nanhai District, Foshan City, multiple detailed drilling surveys were conducted based on shallow seismic exploration. The Leigang Fault faulted the Late Pleistocene strata in the joint profiles of the fourth, third, and second drilling groups. The latest stratigraphic age of the faulted strata is between 40 ka and 50 ka, belonging to the early and middle stages of the Late Pleistocene. The nature of Leigang Fault is reverse and right-lateral, and the maximum vertical displacement is 0.9–2.3 m. The estimated average vertical sliding rate since the early and middle stages of the Late Pleistocene is 0.02–0.06 mm/a. Although the sliding rate of the Leigang Fault is relatively low, it belongs to the Late Pleistocene active fault, and it is necessary to keep aware of the possibility of future earthquakes with magnitude of 6. |
| SONG Yisheng,CHEN Wenbin,YOU Huichuan,TANG Fangtou,LI Jincheng.2026.Evidence of Late Quaternary Activity of the Leigang Fault in Guangzhou[J].Acta Geoscientica Sinica,47(3):480-492. |
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