何奕成^2,,
范小平^1,,,
赵启光²,
霍祝青²,
杨从杰²,
郑雷明¹,
钱浩¹,
郑拓¹
1. 南京工业大学, 南京 211816
2. 江苏省地震局, 南京 210014

基金项目: 国家自然科学基金（41874051，42004078），江苏省高等学校自然科学基金资助项目（20KJB170006）镇江市活动断层探测与地震危险性项目（ZJZCFS-（2017）商字第0006号），《临沂市国际生态城地震断层探测与地震危险性评价》项目，地震联合基金重点项目（U1939209）共同资助


详细信息

作者简介: 何奕成, 男, 1991年生, 主要从事地震层析成像与地震波衰减相关的研究.E-mail: hyckevin@mail.ustc.edu.cn

通讯作者: 范小平, 男, 1974年生, 博士, 研究员, 主要从事地震波散射和衰减研究.E-mail: nj_fxp@njtech.edu.cn

中图分类号: P315

收稿日期:2020-07-02
修回日期:2021-06-07
上线日期:2021-09-10

Segmentation of crustal structure beneath the middle-south segment of Tan-Lu Fault Zone

HE YiCheng^2,,
FAN XiaoPing^1,,,
ZHAO QiGuang²,
HUO ZhuQing²,
YANG CongJie²,
ZHENG LeiMing¹,
QIAN Hao¹,
ZHENG Tuo¹
1. Nanjing Tech University, Nanjing 211816, China
2. Earthquake Administration of Jiangsu Province, Nanjing 210014, China


More Information

Corresponding author: FAN XiaoPing,E-mail:nj_fxp@njtech.edu.cn

MSC: P315

--> Received Date: 02 July 2020
Revised Date: 07 June 2021
Available Online: 10 September 2021


摘要
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.
关键词: 郯庐断裂带/
速度结构/
泊松比/
郯庐断裂带分段特征

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.
Key words:Tan-Lu fault zone/
Velocity structure/
Poisson's ratio/
Segmentation characteristic of Tan-Lu fault zone



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