Amongst various space techniques, GPS-geodesy has proved to be an indispensible tool worldwide for geodynamics and the determination of parameters governing seismotectonics. To study the Indian plate kinematics, an IGS station has been established in September 1995 at NGRI, Hyderabad, India, under the Indo-German collaborative research programme. During the first off-line data transmisssion phase, about one to two days per week of observations were taken. The data analysis has been carried out at the University of Bonn using the Bernese Software version 4.0. The Hyderabad data have been processed together with the data from 8 other selected IGS stations in and around the Indian plate. In our preliminary analysis, which concentrated on the ITRF96 frame-consistent part of the data set, we found the motion of the Indian plate with respect to the Eurasian plate to be significantly smaller than the model rate, i.e. 3.7 cm/y for Hyderabad instead of 4.5 cm/y in the NUVEL-1A plate model. We detected no significant motion between Hyderabad and Bangalore, lying 500 km apart in N-S-direction on the Indian plate.

We report on the activities related to the 1 IAG Subcommission 1.3f "Regional Reference Frame 2 for Antarctica". Campaign-style GPS observations have 3 been carried out since 1995. Based on the Bernese GNSS 4 Software the latest analysis yields results for about 30 5 stations aligned to the terrestrial reference frame solu-6 tion IGS08. The obtained station motions are discussed 7 in the context of plate kinematics and glacial-isostatic 8 adjustment. It is demonstrated that the activities are 9 a valuable contribution both to the ITRF densification 10 in Antarctica and to geodynamic research.

Seismotectonic and the geodynamical processes between India and Antarctica are essential. During the initial 25 years of Indian expeditions, India's National Geophysical Research Institute (NGRI) launched a GPS-Geodesy programme by establishing a permanent GPS tracking station and a state-of-the-art Digital Broad Band Seismological Observatory Maitri during 1997. Both these stations have been continuously operational. It addresses the crustal deformation in the south of the Indian peninsula, the driving mechanisms, and the response of the Indian Ocean lithosphere bringing a deep understanding of the causes of the accumulation processes of strain in the Indian Ocean and the northward movement of the Indian plate.

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