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[1]ZHANG Lei,YUE Chong,SONG Cheng,et al.Application of the Load/Unload Response Ratio Method to the Calculation of Ground Strain in Tianjin[J].Journal of Seismological Research,2025,(02):229-236.[doi:10.20015/j.cnki.ISSN1000-0666.2025.0024 ]

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Application of the Load/Unload Response Ratio Method to the Calculation of Ground Strain in Tianjin

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: Number of periods: 2025 02 Page number: 229-236 Column: Public date: 2025-02-10

Title:: Application of the Load/Unload Response Ratio Method to the Calculation of Ground Strain in Tianjin

Author(s):: ZHANG Lei¹; YUE Chong²; SONG Cheng¹; YU Huaizhong²; (1.Tianjin Earthquake Agency,Tianjin 300201,China)(2.China Earthquake Networks Center,Beijing 100045,China)

Keywords:: cave strain; Load/Unload Response Ratio; b-value; Tianjin city

CLC:: P315.72

DOI:: 10.20015/j.cnki.ISSN1000-0666.2025.0024

Abstract:: According to the stress-strain constitutive relationship of rock,the Load/Unload Response Ratio(LURR)method based on the Coulomb stress triggering model is used to calculate LURR values of the cave strain observed at Jixian seismic station and on Xiaoxinzhuang monitoring spot in Tianjin city.Earthquake cases are selected according to the relationship between the seismogenic range and the magnitude.Variation trend of the observational strain data is analyzed and b-values in Tianjin city and its vicinity are calculated.Results indicate that before the Guye M_S5.1 earthquake in Hebei province,the tension strain in NS and EW component on Xiaoxinzhuang spot sped up,then slowed down after the Guye earthquake.In the meantime,LURR values of the strain on Xiaoxinzhuang spot and its surrounding areas increased,and then decreased.In addition,there was obviously a low b-value region around Xiaoxinzhuang spot from 2018 to 2019.All these precursory anomalies were consistent in time and space.

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Last Update: 2025-03-10