期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2018
卷号：153
期号：6
页码：062044
DOI：10.1088/1755-1315/153/6/062044
语种：English
出版社：IOP Publishing
摘要：To study the movement characteristics of crustal deformation around the epicenter before the Ms6.6 earthquake in Minxian-Zhangxian in 2013, the paper analyzes the GPS velocity field, the baseline time series between stations and the time series of the epicentral region strain, and then discusses the characteristics of the crustal deformation before the earthquake. It is shown from the results that the Lintan-Tanchang fault and the Northern Xiqinling fault are in the inner circle of the clockwise vortex, which have obvious stress accumulation. Among the two velocity fields in 2004-2007 and 2009-2011, there are significant differences in the direction and amplitude of the movement around the Lintan-Tanchang fault, which may cause the risk of earthquake events. The baseline time series reflect the strain accumulation in NE side of Lintan-Tanchang thrust fault with NE-trending was quite high before the earthquake, and the velocity of the SW side was accelerating, which might be the main cause of the earthquake. Since 2013, the extrusion deformation of EW direction and plane shrinkage rate near the epicenter had shown an obvious weakening tendency, as well as the left-lateral shear of NW direction of the causative fault. The evidence of deformation loss before the earthquake was significant and the accumulation of strain was relatively obvious.
