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,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。
Based on the magnetotelluric profile data,combining with geological profiles,medium-depth seismic reflection exploration profiles,modern seismic catalogue,ALOSDEM 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 imagesurface elevation modelshallow fault lineunderground structure of the fault revealed by magnetotelluric explorationunderground fault planeunderground seismic ball-3D model".①The following conclusions are obtained:The Yishu fault zone shows a 3D structure of"two grabens plus one horst"from the surface to the underground as a whole;②The main faults show the characteristics of segmental activity,with obvious differences in occurrence at different segments and complex fault contact relations;③Modern 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 threedimensional 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.
作者
付俊东
许洪泰
夏暖
陈平
王雷
熊仁伟
FU Jun-dong;XU Hong-tai;XIA Nuan;CHEN Ping;WANG Lei;XIONG Ren-wei(Shandong Earthquake Agency,Jinan 250014,China;Institute of Earthquake Forecasting,CEA,Beijing 100036,China)
出处
《地震》
CSCD
北大核心
2023年第3期34-49,共16页
Earthquake
基金
地震科技星火计划攻关项目(XH20035)
山东省地震局重点任务专项(ZDZX202202)
临沂市国际生态城地震断层探测与地震危险性评价。
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
Magnetotelluric sounding
Yishu fault zone
Seismic reflection profile
Three-dimensional model
Blender software
