HR: 0800h
AN: G21A-0108    [Abstracts]
TI: Evaluation Of Elastic Strain Accumulation In The Southern Indian Peninsula By GPS-Geodesy
AU: * NARAYANABABU, R
EM: ravikumar.n@gmail.com
AF: National Geophysical Research Institute, (NGRI), Uppal Road, HYDERABAD, AP 500 007 India
AU: EC, M
EM: ecmalaimani@hotmail.com
AF: National Geophysical Research Institute, (NGRI), Uppal Road, HYDERABAD, AP 500 007 India
AU: TUMMALA, C
EM: chaitanya001@hotmail.com
AF: National Geophysical Research Institute, (NGRI), Uppal Road, HYDERABAD, AP 500 007 India
AB: The computed elastic strain accumulation in the southern Indian peninsula from the GPS derived velocity fields of the global network of GPS stations, in and around the Indian plate which includes Maitri, Indian Antarctic Station, show a significant departure from rigid plate behaviour in a manner consistent with the mapped intra plate stress field, observations of deformations and seismicity in the region. Our results of intraplate strain accumulation within Antarctica Plate covering three sites MAIT, CAS1 and DAV1 are 1.8x10$^{-9}$yr$^{-1}$, 1.6x10$^{-9}$yr$^{-1}$ and 1.1x10$^{-9}$yr$^{-1}$, respectively. Similarly, the estimates of interplate strain accumulation between Antarctica and other plates Somalia (SEY1), Africa (HARO), Australia (YAR1), and diffuse plate boundary between India and Australia (COCO) are found to be 1.1x10$^{-9}$yr$^{-1}$, 1.0x10$^{-10}$yr$^{-1}$, 1.27x10$^{-8}$yr$^{-1}$ and 1.18x10$^{-8}$yr$^{-1}$, respectively. These estimates are in good agreement with the earlier studies on estimation of global strain rate. The combined GPS and seismic analysis confirm the emergence of diffuse plate boundary between India and Australia and relates to the late Miocene Himalayan uplift. The calculated stress field in the West of the Indian Peninsula has a roughly N-S directed tensional and E-W oriented compressional character and the velocity vectors of all other sites throw a significant insight into the plausible causes of the strain accumulation processes in the Indian Ocean and the northward movement of Indian plate.
DE: 9310 Antarctica
DE: 9340 Indian Ocean
DE: 7230 Seismicity and seismotectonics
DE: 8110 Continental tectonics--general (0905)
DE: 8123 Dynamics, seismotectonics
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting