首页|Present-day movement characteristics of the Qinghai Nanshan fault and its surrounding area from GPS observation

Present-day movement characteristics of the Qinghai Nanshan fault and its surrounding area from GPS observation

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
The Qinghai Nanshan fault is a larger fault in the Northeastern Xizang Plateau.In previous studies,its movement characteristics are mainly investigated with geological and seismic observations,and the tectonic transformation role of the fault on its east is not yet clear.This study uses data fusion to obtain denser GPS observations near the Qinghai Nanshan fault.Based on tectonic characteristics,we establish a block model to investigate the fault slip rate,locking degree,and slip deficit.The results show that the Qinghai Nanshan fault slip rate is characterized by sinistral and convergent movement.Both the sinistral and convergent rates display a decreasing trend from west to east.The locking degree and slip deficit are higher in the western segment(with an average of about 0.74 and 1.1 mm/a)and lower in the eastern segment.Then,we construct a strain rate field using GPS observations to analyze the regional strain characteristics.The results indicate that along the fault,the western segment shows a larger shear strain rate and negative dilation rate.Regional earthquake records show that the frequency of earthquakes is lower near the fault.The joint results suggest that the western segment may have a higher earthquake risk.In addition,the insignificant fault slip rate in the eastern segment may indicate that it does not participate in the tectonic transformation among the Riyueshan,Lajishan,and West Qinling faults.

The Qinghai Nanshan faultMovement characteristicsBlock modelSlip rateGPS

Yang Liu、Yuxuan Qiu、Jialiang Liu、Luyun Xiong、Caijun Xu、Jianghui Geng、Gang Zheng、Tianchen Sheng

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School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China

Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,Wuhan University,Wuhan 430079,China

Key Laboratory of Geophysical Geodesy,Ministry of Natural Resources,Wuhan University,Wuhan 430079,China

GNSS Research Center,Wuhan University,Wuhan 430079,China

School of Earth and Environment,University of Leeds,Leeds LS2 9JT,UK

Qinghai Basic Surveying and Mapping Institute,Xining 810101,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities

41874011420740072042023kfyq01

2024

10.1016/j.geog.2023.08.004

大地测量与地球动力学(英文版)
中国地震局地震研究所

大地测量与地球动力学(英文版)

EI
影响因子：0.568
ISSN：1674-9847
年,卷(期)：2024.15(2)
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