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[1]魏 斌,陈长云.新疆及邻区现今GNSS变形特征与地震关系研究[J].地震研究,2024,47(03):419-429.[doi:10.20015/j.cnki.ISSN1000-0666.2024.0022 ]
　WEI Bin,CHEN Changyun.Study on the Relationship between GNSS Deformation Characteristics and Earthquakes in Xinjiang and Its Adjacent Regions[J].Journal of Seismological Research,2024,47(03):419-429.[doi:10.20015/j.cnki.ISSN1000-0666.2024.0022 ]
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新疆及邻区现今GNSS变形特征与地震关系研究(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
47
期数:
2024年03期
页码:
419-429
栏目:
综述
出版日期:
2024-05-01

文章信息/Info

Title:
Study on the Relationship between GNSS Deformation Characteristics and Earthquakes in Xinjiang and Its Adjacent Regions
作者:
魏 斌1; 陈长云2
(1.新疆维吾尔自治区地震局，新疆 乌鲁木齐 830011；2.中国地震局第一监测中心，天津 300180)
Author(s):
WEI Bin1; CHEN Changyun2
(1.Earthquake Administration of Xinjiang Uygur Autonomous Region，Urumqi 830011，Xinjiang，China;2.The First Monitoring and Application Center，China Earthquake Administration，Tianjin 300180，China)
关键词:
GNSS; 应变率; 块体模型; 滑动速率; 地震危险性; 新疆
Keywords:
GNSS; strain rate; block model; strikeslip rate; earthquake risk; Xinjiang
分类号:
P315.725
DOI:
10.20015/j.cnki.ISSN1000-0666.2024.0022
摘要:
基于GNSS观测数据，采用球面最小二乘配置方法计算了新疆及邻区的应变率张量特征，在统计分析研究区域应变率分布以及1900—2022年 M ≥6.0地震分布之间的关系的基础上，研究了GNSS应变率特征对强震地点的指示意义。通过构建三维弹性块体模型反演得到的区内主要断裂的运动变形特征，结合震源机制解结果，对比分析了断裂运动变形特征与不同区域强震类型之间的关系。结果表明：天山西段—帕米尔地区、阿尔金断裂带邻近地区呈现第二应变率高值特征，其中帕米尔构造结附近高值特性最明显；最大剪应变率方向在南天山西段—帕米尔地区主要为NE-NEE向，反映了该区以倾滑变形为主的特征。研究区域的 M ≥6.0地震主要分布在应变率高值区及其边缘，特别是帕米尔构造结东部地区的强震集中非常明显。区内断裂运动性质具有明显的分类特征，除整体以挤压运动为主外，NE走向断裂带以左旋走滑运动为主，NW走向的断裂以右旋走滑运动为主。NE走向的柯坪、迈丹和那拉提断裂带与NW走向的克孜勒陶、塔拉斯—费尔干纳断裂带汇集的南天山西段和帕米尔西构造结东部地区强震密集分布，强震的震源机制类型与断层运动方式较为一致。
Abstract:
Based on GNSS data，the strain rate tensor in Xinjiang and its adjacent areas is calculated by using the spherical least squares collocation method.The relationship between the strain rate and the distribution of M ≥6.0 earthquakes in the study area during 1900-2022 is statistically analyzed.Then the indicative significance of GNSS strain rate characteristics for strongearthquake locations is studied.The major faults deformation characteristics in the study area are inversed with the threedimensional elastic block model.And on the basis of the focal mechanism solutions，the relationship between the faults deformation characteristics and the types of strong earthquakes in the study area is analyzed.The results show that the second strain rate value is high in the west TianshanPamir region and in the adjacent areas of the Altyn fault zone，with the highest value near the Pamir structural juncture.The maximum shear strain rate direction in the Southern Tianshan Mountains and Pamir region is mainly NENEE，reflecting the characteristic of the area dominated by dipslip deformation.The M ≥6.0 earthquakes are mainly distributed in the high strain rate areas and their margins，especially in the eastern region of the Pamir tectonic junction.The fault movement in the area has obvious classification features.The faults in the study area are featured as compression movement on the whole.The NEtrending fault zone is mainly leftlateral，strikeslip，and the NWtrending fault is mainly rightlateral，strikeslip.Strong earthquakes concentrate in the western section of the South Tianshan Mountains and the eastern part of the Pamir syntax，where the NEtrending Keping fault zone，the NEtrending Maidan fault zone，the NEtrending Narati fault zone，the NWtrending Kiziletao fault zone，the NEtrending TalasFergana fault zone converge.In the area the focal mechanism of strong earthquakes is consistent with the faults movement pattern.

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备注/Memo

备注/Memo:
收稿日期：2023-01-03.
基金项目：国家重点研发计划专题（2022YFC3003703）.
第一作者简介：魏 斌（1969-），高级工程师，主要从事地震监测预报预警研究，E-mail：weibin@163.com.
通信作者简介：陈长云（1981-），高级工程师，主要从事地震监测预报与地壳变形研究，E-mail：chency@fmac.ac.cn
更新日期/Last Update: 2024-05-01