Post-Seismic surface deformation studies between India and Burma and the Indian plate kinematics by GPS-Geodesy due to recurrent earthquakes off the coast of Sumatra.

HR: 0800h
AN: U51A-0008 [Abstracts]
TI: Post-Seismic surface deformation studies between India and Burma and the Indian plate kinematics by GPS-Geodesy due to recurrent earthquakes off the coast of Sumatra.
AU: * EC, M
EM: ecm@ngri.res.in
AF: National Geophysical Reserach Institute (NGRI), Uppal Road, Hyderabad, AP 500007, India
AU: Narayana Babu, R
EM: ravikumarn@ngri.res.in
AF: National Geophysical Reserach Institute (NGRI), Uppal Road, Hyderabad, AP 500007, India
AB: The recurring earthquakes off the Sumatra coast even after the devastating earthquake of December 26, 2004, the studies on the influence of these earthquakes on the deformation between India and Burma and the Indian plate kinematics assume a greater urgency. The earlier studies that have been independently carried out using GPS –Geodesy and in a global network solution requires reevaluation. After the December 26, 2004 earthquake, the global network that was formed earlier consisting of 15 IGS GPS stations in and around India encompassing all the plates surrounding India, and having HYDE and IISC in the central India as the core stations are being reassessed now after the September 12 2007 earthquake. Earlier 18 days of GPS data including before and after the earthquake were used in the global network analysis using Bernese software version 4.2 in ITRF-2000 Reference Frame. The baseline lengths from Hyderabad to other chosen sites and the rate of changes were also estimated. Our results show a significant shift of 7.3 mm for HYDE and 7.9 mm for IISC respectively, the stations, which are of primary importance as far as Indian plate kinematic studies are concerned. These two sites which are located in the southern hemisphere of India and around the Northern Indian Ocean show an increasing trend of convergence towards NE and specifically towards the Burmese plate that's corroborated by Vigney C. et al., Nature, July 2005. All these already estimated results are being reprocessed in ITRF-2005 Reference Frame by including a larger data set from 1995 to till date. Our earlier estimation also showed that the stations in Eurasia remain almost constant with time and in essence the whole Indian peninsula has moved by about 7.3mm towards east longitude and Burmese plate, which are also being reevaluated.
DE: 1209 Tectonic deformation (6924)
DE: 1242 Seismic cycle related deformations (6924, 7209, 7223, 7230)
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 7240 Subduction zones (1207, 1219, 1240)
DE: 8123 Dynamics: seismotectonics
SC: Union [U]
MN: 2007 Fall Meeting