Activity Analysis of Hexiwu Fault Based on Artificial Earthquake and Its Set Earthquake Simulation Research
Gao Wuping
Yu Yanxiang
Peng Yuanqian
Zhang Wenpeng
Zhang Andong
Yan Chengguo
Abstract：The Hexiwu fault is a large-scale Quaternary fault in the hinterland of the Beijing-Tianjin-Hebei urban agglomeration,and a series of shallow artificial seismic surveys and drillhole joint profiles have been carried out around the fault,which further revealed that the fracture is an active fracture in the early Late Pleistocene.Recently,Tianjin Seismological Bureau completed four 28T controlled-source artificial seismic surveys across the rupture,providing new evidence for the study of the rupture characteristics and activity of the rupture.The artificial seismic profiles show that:(1)the fracture extends northward and ends between Gaowang Highway and Jingtang Highway;(2)the depths of the shallowest upper fault point on different profiles vary,but generally reach more than 150 m,which indicates that the Heximo Fracture has a segmented distribution,but the rupture activity basically belongs to the same period.Regional data show that the fracture extends southward to connect with the Niudong Fault,which together form a 100 km-long fracture zone,and there is a possibility of earthquakes of magnitude 7 or above.From the demand of Beijing-Tianjin-Hebei urban agglomeration to prevent the risk of large earthquakes,numerical simulation of the rupture setting earthquake Mw7.3 is carried out to analyze the impacts of potential long-period ground shaking on the Beijing-Tianjin-Hebei region.
Keywords：Hexiwu faultJizhong depressionartificial earthquakeBeijing-Tianjin-Hebei urban agglomerationgeophysics
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：15( 1499-1513 )