Special Activity: GPS and Antarctica

GPS studies for Indian plate motion and earthquake hazard assessment

The GPS group at CSIR-NGRI works towards comprehending  the geodynamics of the Indian plate and objective assessment of seismic hazard through understanding of the earthquake occurrence processes in the plate boundary and intraplate regions of Indian subcontinent using GPS measurements.  More than 100 permanent GPS stations are being operated and maintained by the group for assessing earthquake hazard in Kashmir Himalaya, Karakoram Fault system, Garhwal-Kumaun Himalaya, Indo-Burmese Wedge, Shillong Plateau, Andaman-Nicobar Islands, Koyna-warna region and Indian shield. As a part of the Indian Scientific Expedition to Antarctica, the group has established a permanent Seismological and GPS observatory, in the year 1997, at the Indian base station, Maitri, primarily to monitor the seismicity in and around Antarctica and to understand the causes of crustal deformation, glacial and climate related processes in this seismically quiet continent.


Aseismic plate boundary in the Indo-Burmese wedge


gpsa1
Figure GPS network in Indo-Burmese wedge, and estimated site velocity in Indian reference frame. Permanent sites are marked by asterisks.

Profile perpendicular to Churachandpur-Mao fault (CMF) (approximately east-west at lat 24.5°N) showing fault-parallel site velocity. Dashed curve is simulated velocity profile (root mean square, rms, misfit ~0.15 mm/yr) due to locking on CMF at rate corresponding to dextral strike-slip motion of 16 ± 0.5 mm/yr. Continuous curve (rms misfit ~0.08 mm/yr) corresponds to relative motion of 18.6 ± 0.5 mm/yr across Indo-Burmese wedge (IBW), largely accommodated on CMF with very low friction of 0.18. KLF—Kaladan fault; KBF—Kabaw fault. Inset shows partitioning of India Sunda plate motion on CMF in IBW and Sagaing fault (SF).


Coupling ratio estimated from continuous GPS measurements in Garhwal-Kumaun Himalaya.

gpsa2

Ongoing Projects


Project Title
Project Number & Sponsored by

Special Activity: GPS and Antarctica

ILP-0301 (JCK)

Hazard from Earthquakes and Tsunami in the Indian Region: Operation of Permanent Seismological and GPS observatory at Maitri-Antarctica

HEART (PSC-0203)

Geodynamics and Earthquake generating processes in NE India and Andaman subduction zone: Tectonic evolution and uplift of the Shillong Plateau

GENIAS (PSC-0104)

Advanced Research in Engineering and Earth Sciences: Data intensive Research for Earthquake hazard assessment by Modelling the Solid-earth

ARiEES-DREAMS (ISC-0301)

Seismic hazard assessment in the Kashmir Himalaya using geological, seismological, Geodetic data

GAP-701-28 (PK), MoES

Deformation across the Karakoram fault and Kaurik Chango rift and its implications on the NW Himalayan tectonics

GAP-757-28 (JCK), MoES

Staff:

Name Designation
Dr. Joshi K Catherine

Senior Scientist

Dr. Saroj Kumar Mondal

Scientist

Dr. A. Akilan

Scientist

Dr. P. Prasada Rao

Principal Technical Officer

Mr. Amit Kumar Bansal

Senior Technical Officer

Mr. M. Simhadri Naidu

Technical Officer

Mr. V. Rajeshwar Rao

Technical Assistant