GPS-Geodesy for tectonics, kinematics and dynamics of Indian plate and its margins by global network solution


E. C. Malaimani, N. Ravikumar, L. Premkishore & A. Akilan
National Geophysical Research
Institute, Hyderabad, India
ecmalaimani@hotmail.com

Abstract
The GPS-Geodesy program initiated in 1995, by establishing a Permanent IGS GPS Tracking station at NGRI, under the Indo-German Scientific collaboration between NGRI and University of Bonn, Germany, has resulted in the estimation of Indian plate motion to be 37 mm + 2 mm yr. -1 towards NNE direction. To broad base the studies to understand the tectonic activity and crustal deformation in the south of Indian peninsula, the data from the IGS stations in the islands surroundings Indian plate is included in the global network solution. Along with this, since NGRI has a permanent GPS station at Maitri (11° 44’E and 70° 46’S), Indian Stations at Antartica established in 1997 in the ice free oasis of Schirmacheroase between the South African Station SANAE (02°49’W and 71°40’S) and the Japanese Station SYOWA (39035’E and 690 00’S) , the data accured and archived since 1997 were analysed to estimate the co-ordinates of Maitri in ITRF 97 Reference Frame at Epoch 1998.1. To strengthen the study on Indian Plate kinematics by focusing on the Indian Ocean Basin, since very little work has been done in this region, very long baselines from Maitri to the other IGS Stations, in different plates, Diego Garcia, Kerguelen, Hartebeesthoek, Santiago, Yaragadee, and Tidbinbilla have been estimated. We present the estimation of these very long base lines and discuss the plausible causes of northward movement of Indian plate.

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