Abstract:Based on the gravity recovery and climate experiment (GRACE), GPS and absolute gravity data from 2003 to 2013, we discuss and analyze the crustal deformation in the southern margin of the Qinghai-Tibet plateau. The result shows the LHAZ station rising at a rate of 1.5 mm/a from 1999 to 2015, which indicates that the LHAZ station has always been uplifting. We analyze the vertical time series of four stations (LHAZ, TPLJ, CHLM, JMSM) of the remote continuous GPS station package (RCGSP) constructed by southern California integrated GPS network (SCIGN). The GPS results show that the four stations have an average uplifting rate of 2.3±0.11 mm/a from 2003 to 2013. Meanwhile, the vertical displacement time series indicates that the four stations have a slight upward trend from 2003 to 2013, with an average rate of 0.35 mm/a. Combined with absolute gravity data, considering many factors (crustal uplift, erosion, GIA), the gravity variation of LHAZ station in recent years is about -0.97 μGal/a and the rate of crustal bottom thickening at LHAZ station is about 4.4 cm/a, which reveals the characteristics of crustal deformation in the southern margin of the Qinghai-Tibet plateau: crustal uplift and bottom thickening.
LIU Jie,XU Keke,FANG Jian et al. Analysis of Crustal Deformation in the Southern Margin of the Qinghai-Tibet Plateau Based on Modern Geodetic Techniques[J]. jgg, 2021, 41(11): 1183-1188.