Abstract:This study employs the GAMIT/GLOBK software to process data from 83 GNSS stations spanning the period from January of 2009 to June of 2019. The study obtains the velocities of the GNSS stations within the ITRF2014 framework and constructs a three-dimensional velocity field model of Guangxi using the Kriging interpolation method. By combining observations from 136 GNSS stations in Guangxi and its surrounding areas, we calculate the regional strain field using the grid distance weighting method and analyze its characteristics. The results indicate that the average horizontal velocity of the Guangxi region within the ITRF2014 framework is 34.95 mm/a with the predominant direction of N106.3°E. The vertical motion exhibits regional slow uplift and subsidence. The northern area, located north of 23.5°N, experiences compressional deformation characterized by dominant compressive strain in the SN and NW directions. In contrast, the southern region displays extensional deformation with dominant tensile strain oriented in a west-to-east fan-shaped pattern. The shear strain field demonstrates higher values in the peripheral regions and lower values in the central transitional zone. Over the past decade, earthquakes in the region primarily occur in the transition zone from high to low shear strain, showcasing spatial and temporal migration as well as back-and-forth movement along the fault zone.
LING Congcong,LIAO Chaoming,YANG Yifei et al. Establishment of Velocity Field Model and Analysis of Strain Characteristics in Guangxi Region[J]. jgg, 2024, 44(4): 410-416.