刘亢^1,,
李海兵²,
王长在³,
张辉⁴,
肖根如⁵,
李红光¹,
张凌^1,,
1. 中国地震应急搜救中心, 北京 100049
2. 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所, 北京 100037
3. 中国地震局地球物理研究所, 北京 100081
4. 中国地震局兰州地震研究所, 兰州 730000
5. 东华理工大学江西省数字国土重点实验室, 南昌 330013

基金项目: 国家自然科学基金项目（41502206，41504043，41631073）和东华理工大学江西省数字国土重点实验室开放研究基金项目（DLLJ201616）资助


详细信息

作者简介: 刘亢, 男, 1980年生, 博士, 副研究员, 主要从事活动构造方面的研究工作.E-mail:liukang028@163.com

通讯作者: 张凌, 男, 1961年生, 高级工程师, 主要从事地震监测、数据共享等方面的研究工作.E-mail:zhangling903@163.com

中图分类号: P315;P541

收稿日期:2018-02-07
修回日期:2018-06-13
上线日期:2018-11-05

Study of tectonic transformation along the eastern Altyn Tagh fault zone based on small earthquake relocation and focal mechanism solutions

LIU Kang^1,,
LI HaiBing²,
WANG ChangZai³,
ZHANG Hui⁴,
XIAO GenRu⁵,
LI HongGuang¹,
ZHANG Ling^1,,
1. National Earthquake Response Support Service, Beijing 100049, China
2. Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
4. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China
5. Key Laboratory for Digital Land and Resources of Jiangxi Province, East China University of Technology, Nanchang 330013, China


More Information

Corresponding author: ZHANG Ling,E-mail:zhangling903@163.com

MSC: P315;P541

--> Received Date: 07 February 2018
Revised Date: 13 June 2018
Available Online: 05 November 2018


摘要
摘要:阿尔金断裂带东段地区的造转换及其动力学机制研究一直是地学工作者关注的焦点.本文利用双差定位法获取研究区域2008—2017年间6013次地震事件的精确定位数据；整理筛选前人震源机制解36个，并采用P/S波振幅比方法计算获得221个以及CAP方法获得25个震源机制解信息.选择野马河—大雪山断裂作为研究区构造转换研究的突破口，综合小震定位数据与震源机制解信息，并开展野外地质调查进行验证，清晰刻画出该断裂的深部构造形态以及现今的运动特征：由阿尔金断裂带向祁连山方向过渡，断层产状由近直立逐渐转变为倾向南，倾角变缓，震源机制解由走滑性质为主转变为逆冲性质为主，是一个连续渐变的过程，为研究区的构造转换研究提供了直接证据.
关键词: 阿尔金断裂带/
祁连山断裂带/
小震重新定位/
震源机制解/
构造转换

Abstract:The tectonic transformation and kinetic mechanism of the eastern Altyn Tagh fault zone have been a focus issue of geologists. In this work, 6013 earthquakes from 2008 to 2017 in study region were relaocted using the double-difference location algorithm.Meanwhile, we selected 36 focal mechanism solutions from previous study, and determined 221 focal mechanism solutions by using the method of the maximum amplitude ratio between P and S waves, and 25 focal mechanism solutions by the Cut and Paste (CAP) method. The Yemahe-Daxueshan fault zone was selected as an example of the tectonic transformation in study region. Based on these data of small earthquake relocation and focal mechanism solutions, as well as field geological investigations, spatial distribution of the faults and the current movement characteristics of the study area were described in detail. Results suggest that from the Altyn Tagh fault zone to the Qilian mountains, the faults gradually change from nearly-vertical to southward dipping and the focal mechanism solutions also chang from strike slip to dominant thrust, experiencing a continuous transition, which provides direct evidence for the tectonic transformation research.
Key words:Altyn Tagh fault zone/
Qilian mountain fault zone/
Small earthquake relocation/
Focal mechanism solutionism/
Tectonic transformation



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