Segmentation of crustal structure beneath the middle-south segment of Tan-Lu Fault Zone
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摘要:
本文采用双差地震层析成像方法对郯庐断裂带中南段地壳速度和泊松比结构进行了研究，获得了郯庐断裂带中南段中上地壳介质结构的分段特征.结果表明，郯庐断裂带中南段由南至北可以划分为三段，即庐江以南段、庐江至郯城段及郯城以北段，郯城以北段又可细分为郯城至五莲及五莲以北两个亚段.庐江以南段、郯城以北段地壳介质速度和泊松比呈现相对高值，庐江至郯城段地壳介质速度和泊松比呈现相对低值，郯城至五莲亚段地壳介质速度和泊松比都明显高于五莲以北亚段.各段的边界为地壳速度和泊松比的梯度带，区域性断裂构造、中强地震多沿此梯度带分布.地壳介质速度和泊松比梯度带往往与深部物质的运移有关，这可能是构造活动、地震孕育的动力来源.
Abstract:In this paper, the double-difference seismic tomography method is applied to study the crustal velocity and Poisson's ratio structure of the middle-south segment of the Tan-Lu fault zone, and the segmental characteristics of the middle-upper crustal medium structure are obtained. Results show that the Tan-Lu fault zone can be divided into three parts from south to north according to the characteristics of crustal velocity and Poisson's ratio, namely the southern part of Lujiang, the segment from Lujiang to Tancheng, and the northern part of Tancheng. Furthermore, the northern part of the Tancheng segment can be divided into two secondary segments, which are the Tancheng to Wulian part and the northern part of Wulian. The southern part of the Lujiang and northern part of the Tancheng segments show comparatively high velocity and Poisson's ratio, while the segment from Lujiang to Tancheng shows comparatively low velocity and Poisson's ratio. The velocity and Poisson's ratio in the Tancheng to Wulian secondary segment is significantly higher than the northern part of the Wulian secondary segment. Besides, the boundary of each section is the gradient zone of crustal velocity and Poisson's ratio. In addition, the regional fault structure and moderately strong earthquakes distribute along this gradient zone. The gradient zone of Poisson's ratio is often associated with changing and migration of the deep mantle. This means that the upwelling of deep material along the fault zone may be the dynamic source of tectonic activity and preparation of earthquakes.
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图 1
研究区主要断裂、构造及台站、地震分布图
Figure 1.
Geological setting and seismic stations, earthquakes used in the study area
图 4
反演网格及沿郯庐断裂带剖面位置示意图
Figure 4.
Inversion grids and the position of profile along the Tan-Lu fault zone
图 5
利用L-curve选择最佳的正则化参数
Figure 5.
Best regularization parameter was selected by L-curve method
图 6
不同深度的P波棋盘格分辨率测试结果
Figure 6.
The checkboard resolution test of VP at different depths
图 7
不同深度的S波棋盘格分辨率测试结果
Figure 7.
The checkboard resolution test of VS at different depths
表 1
P波初始速度模型
Table 1.
Initial P wave velocity model
深度/km -5 0 5 10 15 20 25 33.9 40 60 VP/(km·s-1) 1.3 5.14 5.87 5.88 6.05 6.32 6.4 6.41 8.06 8.38 
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