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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

45

期数:

2022年01期

页码:

36-47

栏目:

出版日期:

2022-01-20

文章信息/Info

Title:

Analyzing the Tectonic Deformation Characteristics of the Eastern Part of the East Kunlun Fault and Its Adjacent Areas Using GPS and Leveling Data

作者:

陈长云; 占 伟; 郑智江; 唐 毅

(中国地震局第一监测中心,天津 300180)

Author(s):

CHEN Changyun; ZHAN Wei; ZHENG Zhijiang; TANG Yi

(The First Monitoring and Application Center,China Earthquake Administration,Tianjin 300180,China)

关键词:

东昆仑断裂带;  滑动速率;  构造转换;  全球定位系统数据;  水准数据

Keywords:

the East Kunlun Fault;  slip rate;  tectonic transformation;  GPS data;  leveling data

分类号:

P315.241

DOI:

10.20015/j.cnki.ISSN1000-0666.2022.0005

摘要:

基于1999—2016年GPS数据和1980—2010年区域精密水准数据,获取了东昆仑断裂带东部及其邻区主要断裂的滑动速率和区域构造变形特征。结果表示:东昆仑断裂带自西向东的走滑速率衰减非常明显,走滑速率从西大滩—东大滩和阿拉克湖段的约10 mm/a向东到塔藏段衰减至约2 mm/a,速率自西向东每100 km下降梯度约1 mm/a; 东昆仑断裂带阿拉克湖段、托索湖段、下大武段和塔藏段均表现出一定的弱挤压特征。跨岷江断裂剖面显示区域挤压变形自西向东由龙日坝断裂至龙门山断裂带有逐渐减弱的特征。区域最大主应变方向为E-NEE向,最大剪切应变高值区位于阿拉克湖段和托索湖段交汇区域以及巴颜喀拉块体的龙日坝断裂中段区域。分析东昆仑断裂带东部及其邻区主要断裂间的构造转换关系认为,岷山地区的隆起变形主要是因为巴颜喀拉块体自西向东的运动受到了华南块体的阻挡,而非东昆仑断裂带向东延展引起的构造转换。

Abstract:

Based on the GPS data in the period of 1999—2016 and the regional precision leveling data from 1980 to 2010,the slip rates and regional tectonic deformation characteristics of the major faults in the eastern part of the East Kunlun Fault and its adjacent regions are obtained.The attenuation of slip rate from west to east along the East Kunlun Fault is very obvious:from～10 mm/a in the Xidatan-Dongdatan section,and the Arak Lake section eastward to～2 mm/a in the Tazang section,with a rate decrease gradient of～1 mm/a every 100 kilometers from west to east; the Arak Lake,the Tuosuo Lake,the Xia Dawu and the Tazang sections show certain weak extrusion characteristics.GPS profiles across the Minjiang Fault show that the regional extrusion deformation gradually weakens from the west of the Longriba Fault to the east of the Longmenshan Fault.The maximum main strain direction is N-NEE; the high value of the maximum shear strain is located in the intersection area of the Arak Lake and the Tuosuo Lake,and the middle part of the Longriba Fault in the BayanHar block.The analysis of the tectonic transformation relationship between the eastern part of the East Kunlun Fault and its adjacent regions shows that the uplift and deformation in the Minshan area is mainly caused by the west-to-east movement of the BayanHar block blocked by the South China block due to the continuous collision of the Indo-European plate,rather than the tectonic transformation caused by the eastward extension of the East Kunlun Fault.

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备注/Memo

备注/Memo:

收稿日期:2021-03-14
基金项目:国家重点研发专项(2018YFC1503606、2017YFC1500501)资助.

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更新日期/Last Update: 2022-01-20