根据重磁资料解释河北断裂体系与地震地质构造

doi:10.11720/wtyht.2020.1549

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Abstract

Hebei Province is one of the major areas where strong earthquakes occur in China, and the study of seismic structures in this area is of great significance to the understanding of earthquake disasters. Based on the 1:200 000 regional gravity and 1:200 000~1:50 000 aeromagnetic data, the fault system in Hebei Province is systematically studied by using the wavelet multi-scale fault analysis method, and applied to seismological structure analysis. The characteristics of the seismogenic faults of the 1966 Xingtai M7.2,1976 Tangshan M7.8 and 1679 Sanhe—Pinggu M8 earthquake are emphatically analyzed. It is found that the shallow faults of Xinhe fault, Tangshan fault and Xiadian fault are closely related to the deep faults. The plane position of shallow faults overlapped with the deep faults of the Xingtai M7.2 earthquake. The Xingtai M7.2 earthquake is the result of the joint action of the lower deep faults and the shallow Xinhe fault. It is concluded that the processing and interpretation of gravity and aeromagnetic data is an effective, fast and economical method for studying seismogeological structures, which can provide important information for the study of Seismogeological structures.

Key words： Hebei Province gravity aeromagnetic survey fracture system seismological structure

Received: 25 November 2019 Published: 24 June 2020

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	Fei FANG

Cite this article:

Fei FANG. Interpretation of Hebei fault system and seismogeological structure based on gravity and magnetic data[J]. Geophysical and Geochemical Exploration, 2020, 44(3): 489-498.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1549 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I3/489

Bouguer gravity anomaly in Hebei Province and Beijing

Residual gravity anomaly in Hebei Province and Beijing

Aeromagnetic ΔT anomaly in Hebei Province and Beijing

Polarized magnetic anomaly in Hebei Province and Beijing

Recognition of geological body boundary by wavelet modulus maximum

Comparison of other boundary recognition methods(The black box in the picture is the boundary of the model)

Wavelet fracture analysis of gravity anomalies in Hebei Province and Beijing
(a), (b), (c) and (d) are the projections of 45°, 135°, 90° and 0° of the second-order details of wavelet

Wavelet fracture analysis of aeromagnetic anomalies in Hebei province and Beijing
Note: (a), (b), (c) and (d) are the projections of 45°, 135°, 90° and 0° of the second-order details of wavelet

Fault systems interpreted from gravity and magnetic data in Hebei Province and Beijing

Wavelet analysis of gravity anomalies

Tangshan gravity wavelet analysis( the red line in the figure is Tangshan fault)

Fault and epicenter distribution of strong earthquakes in southern sub-depression of Shulu fault basin

Petroleum seismic exploration and artificial seismic sounding results of Xinhe fault

Wavelet analysis of aeromagnetic anomalies in Sanhe-Pinggu(the red line in the figure is Xiadian fracture)

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