Late Quaternary activity of Wulashan Northern fault, North China

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-08-16 DOI:10.3389/feart.2024.1437012

Leihua Wei, Weimin He, Yueren Xu, Yanlin Du, Aopeng Dai, Xiaopeng Song, Shuya Xu, Jingjing Qin

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Abstract

The Late Quaternary activity characteristics of secondary faults located between the main active faults at the boundaries of large basins are of great significance to the overall understanding of regional seismic hazards. The Wulashan Northern Fault (WNF) is located on the northern side of the Ordos Block, within the Northern Margin Fault Basin in North China, between the Sertengshan Piedmont Fault and Daqingshan Piedmont Fault. Current research on the geometry and kinematics of the WNF needs to be improved. In this study, we aimed to determine the shallow structural characteristics and Late Quaternary activity of the WNF using shallow seismic exploration and composite drilling geological cross-sectional analysis. The results indicate that the WNF is not a single surface fault but multiple branches with a northward-dipping stepped surface distribution. The latest activity of the F1 branch with a maximum coseismic vertical dislocation of 0.9 m occurred before 47.08 ± 3.7 ka B.P. The latest and older activities of the branch of F2 with a maximum coseismic vertical dislocation of 0.96 m and 1.15 m occurred before 73.8 ± 2.8 ka B.P. and 91.2 ± 4.4 ka B.P., respectively. According to a series of empirical relationships between length of surface rupture and magnitude, the maximum potential magnitude of the earthquake was determined to be M = 6.5–7.0. We argue that even though the Late Quaternary activity of the WNF was weaker than that of the other boundary faults of the Hetao Basin, the local urban and rural planning and land and resources construction in the Hetao Basin region should pay attention to the seismic risk of the WNF as an independent section in the future for the effect of secular tectonic loading.

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华北乌拉山北部断层晚第四纪活动

位于大型盆地边界主活动断层之间的次级断层的第四纪晚期活动特征对于全面了解区域地震灾害具有重要意义。乌拉山北麓断层（WNF）位于鄂尔多斯地块北侧，华北北缘断陷盆地内，介于色楞山皮山断层和大青山皮山断层之间。目前对 WNF 的几何和运动学研究有待改进。本研究旨在通过浅层地震勘探和复合钻探地质断面分析，确定 WNF 的浅层构造特征和第四纪晚期活动。结果表明，WNF 并非单一的地表断层，而是多条分支，地表呈北倾阶梯状分布。F1 支的最晚活动期为公元前 47.08±3.7 ka 年，最大同震垂直位移为 0.9 m；F2 支的最晚和较早活动期分别为公元前 73.8±2.8 ka 年和公元前 91.2±4.4 ka 年，最大同震垂直位移分别为 0.96 m 和 1.15 m。根据地表破裂长度与震级之间的一系列经验关系，确定地震的最大潜在震级为 M = 6.5-7.0。我们认为，尽管西部断裂带第四纪晚期活动性弱于河套盆地其他边界断层，但在未来河套盆地地区的城乡规划和国土资源建设中，应将西部断裂带作为一个独立断面，关注其在世俗构造荷载作用下的地震风险。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.50

自引率

10.30%

发文量

2076

审稿时长

12 weeks

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