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

摘要/Abstract

摘要： 本文选取沂沭断裂带山东区段作为研究区, 基于大地电磁探测剖面资料, 结合地质剖面、中深地震反射勘探剖面、现代地震目录、 ALOS-DEM数据、卫星影像等数据, 利用Blender三维建模软件, 采用“卫星影像—地表高程模型—浅层断裂线—大地电磁探测揭示的断裂地下结构—地下断裂面—地下地震小球—三维模型”的建模流程, 建立了沂沭断裂带山东区段20 km深度范围内三维模型。得到以下认识: ① 沂沭断裂带从地表到地下整体表现出两堑加一垒的三维结构形态; ② 主要断裂之间表现出分段活动特征, 在不同段落产状差异明显, 断裂接触关系复杂; ③ 现代地震主要沿沂沭断裂内东地堑的两条断裂附近分布, 具有带状分布和丛集分布特征, 活动性较强段地震频次明显高于活动性较弱段。沂沭断裂带三维模型的建立, 为探讨地震与活动断层之间的影响关系、研究沂沭断裂带发震机理和地震情景再现提供依据。

关键词: 大地电磁, 沂沭断裂带, 地震反射剖面, 三维模型, Blender软件

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

中图分类号:

P315.7

付俊东, 许洪泰, 夏暖, 陈平, 王雷, 熊仁伟. 基于大地电磁探测剖面的沂沭断裂带三维模型建立[J]. 地震, 2023, 43(3): 34-49.

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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