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The paper gives a broad overview of the work carried out by the Indian Institute of Technology Bombay (IITB) in determining the post-seismic effect of the December 26, 2004 Sumatra-Andaman earthquake on the Indian plate, using space-based technology, the GPS. A GPS network established by the IITB along the western coast of the Indian peninsular was considered for this purpose, observed and analyzed thoroughly, in order to investigate the potential of GPS technology in studying Earth dynamics. To understand the pattern of movement of the Earth's surface to the effect of the large Sumatra-Andaman earthquake, the magnitude and, most importantly, the direction of deformation of the GPS network were estimated. The GPS-estimated deformations were thereby used as indicators to identify any change in the Earth surface movement due to the large external force caused by the 2004 earthquake. [ABSTRACT FROM AUTHOR]