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[1]ZHANG Chen,JI Lingyun,ZHU Liangyu,et al.Analysis of the Crustal Deformation of the Eastern Himalayan Syntaxis and Its Adjacent Areas Based on the Earthquake Focal Stress and GPS Strain[J].Journal of Seismological Research,2022,45(04):526-534.[doi:10.20015/j.cnki.ISSN1000-0666.2022.0051]

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Analysis of the Crustal Deformation of the Eastern Himalayan Syntaxis and Its Adjacent Areas Based on the Earthquake Focal Stress and GPS Strain

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 45 Number of periods: 2022 04 Page number: 526-534 Column: Public date: 2022-08-20

Title:: Analysis of the Crustal Deformation of the Eastern Himalayan Syntaxis and Its Adjacent Areas Based on the Earthquake Focal Stress and GPS Strain

Author(s):: ZHANG Chen; JI Lingyun; ZHU Liangyu; XU Jing; (The Second Monitoring and Application Center,China Earthquake Administration,Xi’an 710054,Shaanxi,China)

Keywords:: the Eastern Himalayan Syntaxis; focal mechanism solutions; stress field; GPS strain rate; characteristics of the crustal deformation

CLC:: P313.21

DOI:: 10.20015/j.cnki.ISSN1000-0666.2022.0051

Abstract:: This paper uses the focal mechanism solutions of M_L≥2.0 earthquakes from 1976 to 2020 to invert the focal stress field in the Eastern Himalayan Syntaxis and its surrounding areas,and uses the GPS strain rate field to analyze the current crustal deformation in this area.The results show that on the eastern boundary of the Sichuan-Yunnan block and inside the block,the direction of the maximum horizontal stress changes continuously,almost in the same direction as GPS principal compressive strain; this indicates that the shallow and the deep parts of the upper Crust are driven by forces in the same direction.On the western boundary of the Sichuan-Yunnan block,the direction of the maximum horizontal stress differs sharply from the direction of GPS principal compressive strain,and the regional average can reach up to 42°; this indicates that different driving mechanisms exist in the deep and the shallow of the upper Crust.

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Last Update: 2022-08-01