The group has established around 75 permanent GPS observatories in the tectonically significant regions like Andaman subduction zone, Garhwal-Kumaun Himalaya, Kashmir Himalaya, Indo-Burmese arc and across Karakoram Fault, in the plate boundary regions and Koyna-Warna region in the intraplate region. Besides this, the group has established permanent GPS observatories throughout India to constrain Indian plate motion and to understand the strain accumulation in the plate interior regions. Most of these sites are connected through VSAT for online data transmission and for archiving the data at INCOIS (Indian National Centre for Ocean Information Services) and NCS (National Centre for Seismology). As a part of the Indian Scientific Expedition to Antarctica, to estimate the plate motion and to understand the causes of crustal deformation in the seismically quiet continent, Antarctica, the group has established one permanent GPS and Seismic observatory at the Indian base station, Maitri. Data from this site are being archived at NCAOR, Goa. The group has a well equipped GPS data center to process, analyse and model the GPS data.
GPS data from various GPS networks established in the country have been utilized to understand the Indian plate motion and strain accumulation in the plate boundary and intraplate regions of India. Evidence of strain accumulation in the Andaman region for the 2004 Sumatra-Andaman earthquake, estimation of the source parameters of the great earthquakes in the region, their postseismic deformation threw insights into the mechanism of aftershock occurrence, role of sediment and 900E ridge subduction. Discovery of a plate boundary fault In the Indo-Burmese wedge which accommodates part of the motion between the India and Sunda plate, its low seismic hazard, and earthquake occurrence processes in the region was of global significance. Coordinates and velocity (4.6 mm/year predominantly towards north) of the Indian base station, Maitri, Antactica are under continuous observation. The ionosphere response to the great intraplate Indian Ocean earthquake of April 11, 2012 ( Mw 8.6) and its largest aftershock (Mw 8.2), and the April 25, 2015 Gorkha, Nepal earthquake is analysed using GPS Total Electron Content (TEC) measurements.
|Dr. Gahalaut V. K||Chief Scientist|
|Dr. Joshi Catherine K||Principal Scientist|
|Dr. Saroj Kumar Mondal||Senior Scientist|
|Mr. Amit Kumar Bansal||Senior Technical Officer (3)|
|Mr. Simhadri Naidu||Senior Technical Officer (1)|
|Mr. Rajeswara Rao V||Technician (2)|
|Mr. Krishna V||Multi Tasking staff|
Page Last Updated On : 11-05-2021