基于大地电磁探测剖面的沂沭断裂带三维模型建立

doi:10.12196/j.issn.1000-3274.2023.03.003

Abstract

Abstract: Based on the magnetotelluric profile data, combining with geological profiles, medium-depth seismic reflection exploration profiles, modern seismic catalogue, ALOS-dem data, satellite images and other data, the Shandong section of the Yishu fault zone is selected as the research area. The 3D model of the Yishu fault zone in the depth of 20 km in Shandong is established by using the three-dimensional modeling software Blender, and the modeling process of “satellite image—surface elevation model—shallow fault line—underground structure of the fault revealed by magnetotelluric exploration—underground fault plane—underground seismic ball—3D model”. The following conclusions are obtained: ① The Yishu fault zone shows a 3D structure of two grabens plus one horst from the surface to the underground as a whole; ② The main faults show the characteristics of segmental activity, with obvious differences in occurrence at different segments and complex fault contact relations; ③ Modern earthquakes are mainly distributed along the two faults of the eastern graben in the Yishu fault, with the characteristics of zonal and cluster distributions. The frequency of seismic activity in the strong activity section is obviously higher than that in the weak activity section. The establishment of the three-dimensional model of the Yishu fault zone provides a basis for discussing the influence relationship between earthquakes and active faults, studying the seismogenic mechanism of the Yishu fault zone and reproducing earthquake scenarios.

Key words: Magnetotelluric sounding, Yishu fault zone, Seismic reflection profile, Three-dimensional model, Blender software

CLC Number:

P315.7

FU Jun-dong, XU Hong-tai, XIA Nuan, CHEN Ping, WANG Lei, XIONG Ren-wei. Establishment of Three-Dimensional Model of Yishu Fault Zone Based on Magnetotelluric Profiles[J]. EARTHQUAKE, 2023, 43(3): 34-49.

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Establishment of Three-Dimensional Model of Yishu Fault Zone Based on Magnetotelluric Profiles

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