Contemporary horizontal crustal movement estimation for northwestern Vietnam inferred from repeated GPS measurements

摘要: We present a horizontal velocity field determined from GPS network with 22 sites surveyed 2001 to 2012 in northwestern Vietnam. The is accurately estimated at each site by fitting linear trend coordinate time series, after accounting for coseismic displacements caused the 2004 Sumatra and 2011 Tohoku earthquakes using static fault models. Considering effects of earthquakes, motion Vietnam 34.3 ± 0.7 mm/yr an azimuth N108° 0.7°E ITRF2008. This close to, but slightly different from, that South China block. area transition zone between this block, Sundaland Baoshan sub-block. At local scale, detailed estimation crustal deformation across major zones geodetically revealed first time. identify locking depth 15.3 9.8 km accumulating left-lateral slip rate 1.8 0.3 Dien Bien Phu fault, shallow right-lateral 1.0 0.6 Son La Da River faults.