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[1]ZHANG Bo,WANG Baoshan,LI Lu,et al.Seismicity in the Region around the Nurga Reservoir in Xinjiang[J].Journal of Seismological Research,2024,47(04):503-516.[doi:10.20015/j.cnki.ISSN1000-0666.2024.0056 ]

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Seismicity in the Region around the Nurga Reservoir in Xinjiang

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 47 Number of periods: 2024 04 Page number: 503-516 Column: Public date: 2024-08-20

Title:: Seismicity in the Region around the Nurga Reservoir in Xinjiang

Author(s):: ZHANG Bo¹; 6; WANG Baoshan¹; 2; 3; LI Lu¹; WEI Bin⁴; SU Jinbo¹; 5; 4; (1.Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)(2.School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,Anhui,China)(3.Mengcheng National Geophysical Observatory,University of Science and Technology of China,Hefei 230026,Anhui,China)(4.Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)(5.Urumqi Institute of Central Asia Earthquake,China Earthquake Administration,Urumqi 830011,Xinjiang,China)(6.School of Earth Sciences,Institute of Disaster Prevention,Sanhe 065201,Hebei,China)

Keywords:: the Nurga Reservoir; micro-earthquake detection; waveform cross-correlation; earthquake location; seismicity

CLC:: P315.72

DOI:: 10.20015/j.cnki.ISSN1000-0666.2024.0056

Abstract:: Reservoirs located in the area with active tectonics are threatened by both tectonic earthquakes and reservoir-triggered earthquakes.To further understand the relationship between the reservoir impoundment and the seismicity in the active tectonic zone,we detected the earthquake events around the Nurga Reservoir from 2014 to 2018 using the matched filter technique(MFT)and the double-difference location(hypoDD)method.As a result,the minimum magnitude of completeness(M_C)dropped from 1.1 to 0.5,while b-value was 0.86.More than 2 600 events were detected and 1 064 of them were relocated.Two earthquake clusters occurred within 5 km in the lower reaches of the Nurga Reservoir area after the Reservoir's impoundment.They were generated by different seismogenic structures controlled by the Changji anticline and the Kalazha anticline respectively.The seismicity in this area correlated well with the periodic changes of the Reservoir's water level.The water flows along the glutenite layer to the earthquake source area,causing the tectonic stress release.This is the main reason for the seismicity in the reservoir area.

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Last Update: 2024-08-20