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Following the great Sumatra earthquake of 26 December 2004, India has strengthened crustal deformation studies in the Andaman and Nicobar Islands and adjoining regions by using the global positioning system (GPS).The rupture characteristics of the earthquake in this region are not well resolved through the seismological data.

Although GPS observations in the Andaman and Nicobar region just before and after the earthquake have provided improved estimates of rupture characteristics [Gahalaut et al., 2006], there is still a need for detailed GPS-aided crustal deformation studies in order to understand the geodynamics of the region.