Basement structure characteristics of the Lingwu depression in southern Yinchuan Basin

CHEN Xiao-Jing; HU Xin-Jun; BAI Ya-Dong; WU-Yang; CHEN Tao-Tao; CAO Yuan-Yuan; NI-Ping

doi:10.11720/wtyht.2022.1314

2022 Vol. 46, No. 4

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Article navigation > Geophysical and Geochemical Exploration > 2022 > 46(4): 862-867

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CHEN Xiao-Jing, HU Xin-Jun, BAI Ya-Dong, WU-Yang , CHEN Tao-Tao, CAO Yuan-Yuan, NI-Ping. 2022. Basement structure characteristics of the Lingwu depression in southern Yinchuan Basin. Geophysical and Geochemical Exploration, 46(4): 862-867. doi: 10.11720/wtyht.2022.1314

Citation:

CHEN Xiao-Jing, HU Xin-Jun, BAI Ya-Dong, WU-Yang , CHEN Tao-Tao, CAO Yuan-Yuan, NI-Ping. 2022. Basement structure characteristics of the Lingwu depression in southern Yinchuan Basin. Geophysical and Geochemical Exploration, 46(4): 862-867. doi: 10.11720/wtyht.2022.1314

Basement structure characteristics of the Lingwu depression in southern Yinchuan Basin

Geophysical and Geochemical Exploration Institute of the Ningxia Hui Autonomous Region,Yinchuan 750001,China

Received Date: 11 June 2021

Revised Date: 20 August 2022

Publish Date: 17 August 2022

Abstract

Abstract

The Lingwu depression,located in the southeastern part of the Yinchuan Faulted Basin,has a complex geological tectonic framework and serves as the turning and intersection part of structures due to the two Himalayan tectonic stresses,namely the EW-direction tensile stress of the Ordos block and the NE-direction compressive stress of the Qinghai-Xizang Plateau. Since 1970, more than 3000 earthquakes with magnitudes of greater than 2.0 have been monitored in the Yinchuan Basin and its periphery. Among them, most of the small and moderately strong earthquakes occurred in the Lingwu depression, which, therefore, has serious hidden risks of earthquake disasters. Previous studies indicate that fault structures are the cause for the earthquakes and that strata serve as the main reason for the earthquake secondary disasters in this depression. To interpret the geological structures in the basement of the Lingwu depression, this study finely characterized the basement characteristics of the Lingwu depression using the 2.5D human-computer interactive inversion technology based on the 1：50,000 regional gravity data and the constraints of data on drill holes, seismic profiles, magnetotelluric sounding, and controlled source audio-frequency magnetotellurics (CSAMT) profiles, thus providing a basis for the prevention and control of earthquake disasters.
- Lingwu depression /
- 1：50,000 gravity /
- 2.5D human-computer interactive inversion /
- basement structure

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References

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