GPS Velocities

Our primary data in this study is a solution of 164 stations, including 42 campaign style sites from central and northwestern India and 14 CGPS from India's continental interior stations that we processed. The earliest campaign data were collected in 1995, but most sites were first occupied in 2001. Occupations have been repeated every year since although some stations have been lost. Each survey-style station was occupied for 4-6 days continuously, once a year. Processing details can be found in (Banerjee and Bürgmann, 2002). Selected, globally distributed IGS sites were used to define an ITRF00 reference frame.

In addition to our own analysis we integrate GPS-station velocities from published work along the Himalayans, throughout China, and Southeast Asia. We integrate a large number of published solutions (Apel et al. and references therein, 2006b) with our own solution. These velocities were combined with our solutions by rotating them into a common reference frame. We combine velocities published in an ITFR00 reference frame into our own solution by minimizing the misfit at co-located stations. After the combination we compare our combined solution the published values to estimate misfit. For most sites the RMS is $\sim$1-2 mm/yr, well within the 95% confidence intervals for these sites.