New model of Antarctic plate motion and its analysis

作者：Jiang Wei Ping^*; E Dong Chen; Zhan Bi Wei; Liu You Wen

来源：Chinese Journal of Geophysics, 2009, 52(1): 41-49.

DOI：10.1002/cjg2.1323

• SCAR
• GPS
• Velocity field
• Antarctic plate
• Crust movement

Since 1995, Antarctic crustal movement campaign has been taking place by Scientific Committee on Antarctic Research (SCAR) every year. We analyse SCAR campaign data from 1997 to 2004 and some continuous GPS stations in Antarctica using GAMIT/GLOBK software. The data analysis involves two major procedures. The first procedure uses the GAMIT software to estimate parameters such as station position and orbital trajectory on a daily basis for a given 24 hour interval from the union of three data sets: (1) the campaign stations, (2) the continuously operating GPS stations in Antarctica, (3) long-running continuous GPS stations around Antarctica. In the second procedure, we combine the daily solutions with global GPS sub-networks (IGS1, IGS2, IGS3), which is provided by Scripps Institution of Oceanography (SIO), using the GLOBK software in a "regional stabilization" approach in order to estimate the positions and velocities. Then we discuss present-day crustal movement of Antarctic plate. The position of the rotation pole (58.69 degrees N, 128.29 degrees W)and its rate (0.224(degrees)/Ma) derived from SCAR GPS data is significantly different from the NNR-NUVEL-1A estimations or from some GPS results for the Antarctic tectonic plate. As for the relative angular motion between Antarctic and Australian, the differences between the results from the paper and some other models are better. All differences for rotation rate are smaller than 0.01(degrees)/Ma, and for rotation pole are smaller than 4 degrees. The GPS results give the new and precise model on Antarctic plate motion.

• 出版日期2009-1
• 单位武汉大学