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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

45

期数:

2022年04期

页码:

509-516

栏目:

出版日期:

2022-08-20

文章信息/Info

Title:

Double-difference Imaging of Crustal Velocity Structure in the Northern Shanxi Rift Valley and Its Seismogenic Tectonic Analysis

作者:

李哲; 郑勇

(中国地质大学(武汉)地球物理与空间信息学院,湖北 武汉 430074)

Author(s):

LI Zhe; ZHENG Yong

(Institute of Geophysics & Geomatics,China University of Geosciences,Wuhan 430074,Hubei,China)

关键词:

山西裂谷带;  地壳速度结构;  双差层析成像;  发震构造

Keywords:

the Shanxi Rift;  crustal velocity structure;  the Double-difference Tomography;  seismogenic tectonic

分类号:

P315.24

DOI:

10.20015/j.cnki.ISSN1000-0666.2022.0055

摘要:

山西裂谷带是华北克拉通差异性破坏的过渡区域,其结构和发震构造对于认识该区域的动力学机制和发震机制具有重要意义。通过地震双差层析成像方法对山西裂谷带北部地壳速度结构进行成像,得到该区域的速度结构图像及发震构造。结果显示:①山西裂谷带北部地震震源深度较浅,断裂构造复杂; 在地壳浅部,速度异常与地形构造相吻合; ②在中下地壳,速度结构开始主要受到火山下方物质的影响,呈现部分低速异常; ③在山西裂谷带两侧,太行山脉相较于吕梁山脉有着更浅的山根,吕梁山脉北端下方存在明显的高速异常,可能与华北克拉通的差异性破坏存在关系。

Abstract:

The Shanxi Rift Zone is a transitional region of differential disruption located in the central part of the North China Craton.In the northern part of the Rift there are more active tectonic movements due to the influence of the Datong Volcanic Belt,and the Rift’s structures including the seismogenic structure are important for understanding the dynamical and seismogenic mechanisms of the region.In this paper,the velocity structure of the crust and seismogenic structures in the northern Shanxi Rift Valley is imaged by the Seismic Double-difference Tomography.It is found that:① The seismogenic depth in the northern Shanxi Rift is shallow and the fracture structure is complex.In the shallow part of the crust,the velocity anomaly coincides with the topographic structure; ② In the middle and lower crust,the velocity structure mainly influenced by the material below the volcanoes features some low velocity anomalies; ③ On one side of the Shanxi Rift,the Taihang Mountains have shallower roots compared with the Luliang Mountains on the other side,and there are obvious high velocity anomalies below the northern end of the Luliang Mountains.This may be related to the differential disruption of the North China Craton.

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备注/Memo

备注/Memo:

收稿日期:2022-02-21
基金项目:国家自然科学基金(41874053、42030108、41731072)和中央高校基本业务费(162301132637)联合资助.

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更新日期/Last Update: 2022-08-01