Electrical structure of the Tianjin—Tanggu segment of the Zhangjiakou—Bohai seismic belt and its importanceTianjin 300170, China)
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P315

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    Abstract:

    The Zhangjiakou-Bohai seismic belt is a seismic fault zone in the northern part of North China. The Jiyunhe fault zone in its middle segment constitutes the western boundary of the Tangshan rhombus block, and it is considered the seismogenic fault of the Ninghe M6.9 earthquake in 1979. To effectively reveal the deep structure and seismogenic dynamic environment of this region, we conducted a magnetotelluric sounding profile in the Dagang—Yutian area, which directly crosses the epicenter of the Ninghe M6.9 earthquake and is almost perpendicular to the Zhangjiakou—Bohai fault zone. Detection results show that the electrical structure in the study area is layered vertically and partitioned horizontally. Additionally, the magnetotelluric sounding profile reveals the deep structural characteristics of some regional faults, i.e., the Haihe fault, Hangu fault, and Jiyunhe fault in the middle section of the Zhangjiakou—Bohai fault zone, in which the Hangu fault may be a deep fault that runs through the crust. The good correlation between the high and low resistivity gradient zones and the epicenters of the Ninghe M6.9 earthquake and the other two M6.2 earthquakes in Hangu suggests that the moderate- strong earthquakes in the study area are closely related to the development of obvious high and low resistivity gradient zones in the deep area.

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  • Online: April 03,2023
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