Inversion for 3D density structure in the middle segment of Tanlu fault zone and its implication
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摘要: 为深入理解研究区的构造运动规律，进一步探求地壳物质可能的运移模式，本文基于Crust1.0地壳结构模型和最新莫霍面深度模型对自由空气重力异常数据进行联合约束，采用三维重力反演技术得到了郯庐断裂带中段的三维密度结构。反演结果显示，研究区的背景场稳定，断裂构造发育部位表现为重力密度低值，特别是营潍断裂带正处于大范围的重力密度低值区并纵贯整个研究区，由此可推断重力密度低值区可指示断裂构造的存在。Abstract: Since the Cenozoic, the tectonic movement of the Tanlu fault zone has been active, and on the middle segment of Tanlu fault zone occurred many strong earthquakes in history. To better understand the tectonic movement in the studied area, further to explore the possible migration patterns of crustal material, we used the 3D gravity inversion to obtain 3D density structure of the middle segment of Tanlu fault zone, with the Crust1.0 model and the Moho relief model from ChinArray project as constraint of free air gravity anomaly data. The 3D density structure shows that the background of the studied area is stable, there were low gravity density areas in the fault structure development areas, especially Yingwei fault zone was just in a series of low gravity area throughout the studied area, therefore it was deduced that the low gravity area can indicate the existence of fault structure.
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图 1 研究区构造分布（邓起东等，2010）
F1：赤峰—开原断裂； F2：朝阳—北票断裂； F3：依兰—伊通断裂；F4：密山—抚顺断裂；F5：营维断裂带；F6：金州断裂；F7：庄河断裂；F8：鸭绿江断裂；F9：昌邑—大店断裂；F10：鄌郚—葛沟断裂，下同
Figure 1. Structure distribution in the studied area （after Deng et al，2010）
F1：Chifeng-Kaiyuan fault；F2：Chaoyang-Beipiao fault；F3：Yilan-Yitong fault；F4：Mishan-Fushun fault；F5：Yingwei fault zone；F6：Jinzhou fault；F7：Zhuanghe fault；F8：Yalujiang fault；F9：Changyi-Dadian fault；F10：Tangwu-Gegou fault，the same below
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图 2 郯庐断裂带中段及周边布格重力异常特征图
Figure 2. Characteristics of Bouguer gravity anomalies in the middle segment of Tanlu fault zone and its surrounding regions
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图 3 沿37°N （a）和41°N （b）东西向剖面的Crust1.0地壳密度模型
图中数字表示地壳密度值，单位为g·cm−3；蓝色为相对低密度结构体，红色为相对高密度结构体
Figure 3. Crustal density model by Crust1.0 along the latitude 37°N （a） and 41°N （b）
The numbers represent the initial crustal density with unit of g·cm−3. The blue color indicates the lower density structure，and the red color indicates the higher density structure
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图 4 郯庐断裂带中段及附近壳内剩余密度异常体的重力异常特征
Figure 4. The gravity anomaly of residual density bodies in the crust in the middle segment of Tanlu fault zone and its vicinity
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图 5 三维重力反演结果在12 km深度处的水平密度结构切片
Figure 5. The density structure slice derived from the gravity inversion result at the depth of 12 km
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