| Analysis of Anomalous Characteristics of Regional Crustal Deformation before the September 16th, 2019 Zhangye MS5.0 Earthquake, Gansu, China |
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| 作者姓名： | MA Haiping WANG Qian ZHANG Bo WU Shanyi WANG Pengtao DOU Xiying LI Minjuan |
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| 作者单位： | Gansu Earthquake Agency, Lanzhou 730000, China;Lanzhou Geophysical Field Science State Observation Station, Lanzhou 730000, China |
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| 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). |
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| 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.
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| 关 键 词： | Zhangye MS5.0 earthquake GPS reference station Velocity field Baseline azimuth time-series Strain time series |
| 收稿时间： | 2019/11/6 0:00:00 |
| 修稿时间： | 2019/12/20 0:00:00 |
Analysis of Anomalous Characteristics of Regional Crustal Deformation before the September 16th, 2019 Zhangye MS5.0 Earthquake, Gansu, China |
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| MA Haiping,WANG Qian,ZHANG Bo,WU Shanyi,WANG Pengtao,DOU Xiying,LI Minjuan.Analysis of Anomalous Characteristics of Regional Crustal Deformation before the September 16th, 2019 Zhangye MS5.0 Earthquake, Gansu, China[J].Earthquake Research in China,2020,34(2):210-218. |
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| Authors: | MA Haiping WANG Qian ZHANG Bo WU Shanyi WANG Pengtao DOU Xiying LI Minjuan |
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| Institution: | Gansu Earthquake Agency, Lanzhou 730000, China;Lanzhou Geophysical Field Science State Observation Station, Lanzhou 730000, China |
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| 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. |
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| Keywords: | Zhangye MS5 0 earthquake GPS reference station Velocity field Baseline azimuth time-series Strain time series |
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