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Analysis of Anomalous Characteristics of Regional Crustal Deformation before the September 16th, 2019 Zhangye MS5.0 Earthquake, Gansu, China
MA Haiping1,2, WANG Qian1, ZHANG Bo1,2, WU Shanyi1,2, WANG Pengtao1,2, DOU Xiying1,2, LI Minjuan1,2
1.Gansu Earthquake Agency, Lanzhou 730000, China;2.Lanzhou Geophysical Field Science State Observation Station, Lanzhou 730000, China
摘要:
To study the crustal movement in the vicinity of the epicenter before the Zhangye MS5.0 earthquake in 2019, the characteristics of crustal deformation before the earthquake are discussed through the GPS velocity field analysis based on the CMONOC data observed from GPS. The baseline time series between two continuous GPS stations and the strain time series of an area among several stations are analyzed in the epicenter area. The resulting time series of baseline azimuth around the epicenter reflects that the energy of the fault in the northern margin of Qilian Mountain is accumulated continuously before 2017. Besides, the movement trend of azimuth slows down after 2017, indicating the stress accumulation on both sides of the seismogenic fault zone has reached a certain degree. The first shear strain and EW-direction linear strain in the epicentral area of the Zhangye MS5.0 earthquake remain steady after 2017, and the surface strain rate decreases gradually after 2016. It is illustrated that there is an obvious deformation loss at the epicentral region three years before the earthquake, indicating that a certain degree of strain energy is accumulated in this area before the earthquake.
关键词:  Zhangye MS5.0 earthquake  GPS reference station  Velocity field  Baseline azimuth time-series  Strain time series
DOI:10.19743/j.cnki.0891-4176.202002002
分类号:
基金项目:This project is sponsored by the Fund of Science for Earthquake Resilience (XH21035Y, XH20057), the Earthquake Tracking Track of CEA(2020010211,2018010204),the Earthquake Science and Technology Development Fund of CEA (2016M02, 2017IESLZ07), and National Natural Science Foundation of China (51478444, 41304048).
Analysis of Anomalous Characteristics of Regional Crustal Deformation before the September 16th, 2019 Zhangye MS5.0 Earthquake, Gansu, China
MA Haiping1,2, WANG Qian1, ZHANG Bo1,2, WU Shanyi1,2, WANG Pengtao1,2, DOU Xiying1,2, LI Minjuan1,2
1.Gansu Earthquake Agency, Lanzhou 730000, China;2.Lanzhou Geophysical Field Science State Observation Station, Lanzhou 730000, China
Abstract:
To study the crustal movement in the vicinity of the epicenter before the Zhangye MS5.0 earthquake in 2019, the characteristics of crustal deformation before the earthquake are discussed through the GPS velocity field analysis based on the CMONOC data observed from GPS. The baseline time series between two continuous GPS stations and the strain time series of an area among several stations are analyzed in the epicenter area. The resulting time series of baseline azimuth around the epicenter reflects that the energy of the fault in the northern margin of Qilian Mountain is accumulated continuously before 2017. Besides, the movement trend of azimuth slows down after 2017, indicating the stress accumulation on both sides of the seismogenic fault zone has reached a certain degree. The first shear strain and EW-direction linear strain in the epicentral area of the Zhangye MS5.0 earthquake remain steady after 2017, and the surface strain rate decreases gradually after 2016. It is illustrated that there is an obvious deformation loss at the epicentral region three years before the earthquake, indicating that a certain degree of strain energy is accumulated in this area before the earthquake.
Key words:  Zhangye MS5.0 earthquake  GPS reference station  Velocity field  Baseline azimuth time-series  Strain time series