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Analysis of Abnormal Characteristics of Regional Crustal Deformation before the Menyuan MS6.4 Earthquake by GPS Continuous Data
Ma Haiping,Feng Jiangang,Guo Peng,Shi Xuelu
Author NameAffiliationE-mail
Ma Haiping Lanzhou Institute of Seismology, China Earthquake Administration(CEA), Lanzhou 730000, China  
Feng Jiangang Lanzhou Institute of Seismology, China Earthquake Administration(CEA), Lanzhou 730000, China fjgspring@163.com 
Guo Peng Lanzhou Institute of Seismology, China Earthquake Administration(CEA), Lanzhou 730000, China  
Shi Xuelu Lanzhou Institute of Seismology, China Earthquake Administration(CEA), Lanzhou 730000, China  
摘要:
In order to study the characteristics of crustal deformation around the epicenter before the 2016 MS6.4 Menyuan earthquake, the GPS continuous stations of the period from 2010 to 2016 were selected according to the observation data of the tectonic environment monitoring network in Chinese Mainland. The deformation characteristics of the crust before the earthquake were discussed through inter-station baseline time series analysis and the strain time series analysis in the epicentral region. The results show that a trend turn of the baseline movement state around the epicenter region occurred after 2014, and the movement after 2014 reflects an obvious decreasing trend of compressional deformation. During this period, the stress field energy was in a certain accumulation state. Since the beginning of 2014, the EW-component linear strain and surface strain rate weakened gradually before the earthquake. It shows that there was an obvious deformation deficit at the epicentral area in the past two years, which indicates that the region accumulated a high degree of strain energy before the earthquake. Therefore, there was a significant background change in the area before the earthquake. The results of the study can provide basic research data for understanding the seismogenic process and mechanism of this earthquake.
关键词:  Menyuan MS6.4 earthquake  GPS reference station  Baseline time series  Strain time series
DOI:
分类号:
基金项目:This research was funded by the Earthquake Science and Technology Development Fund of GEA (Grant No.2016M02,2016Y02),the Earthquake Tracking Task of CEA (2017010221),the Fund of Science for Earthquake Resilience,CEA,(XH16038Y,XH14049),and Grant of National Natural Science Foundation of China (51408567,41304048).
Analysis of Abnormal Characteristics of Regional Crustal Deformation before the Menyuan MS6.4 Earthquake by GPS Continuous Data
Ma Haiping,Feng Jiangang,Guo Peng,Shi Xuelu
Abstract:
In order to study the characteristics of crustal deformation around the epicenter before the 2016 MS6.4 Menyuan earthquake, the GPS continuous stations of the period from 2010 to 2016 were selected according to the observation data of the tectonic environment monitoring network in Chinese Mainland. The deformation characteristics of the crust before the earthquake were discussed through inter-station baseline time series analysis and the strain time series analysis in the epicentral region. The results show that a trend turn of the baseline movement state around the epicenter region occurred after 2014, and the movement after 2014 reflects an obvious decreasing trend of compressional deformation. During this period, the stress field energy was in a certain accumulation state. Since the beginning of 2014, the EW-component linear strain and surface strain rate weakened gradually before the earthquake. It shows that there was an obvious deformation deficit at the epicentral area in the past two years, which indicates that the region accumulated a high degree of strain energy before the earthquake. Therefore, there was a significant background change in the area before the earthquake. The results of the study can provide basic research data for understanding the seismogenic process and mechanism of this earthquake.
Key words:  Menyuan MS6.4 earthquake  GPS reference station  Baseline time series  Strain time series