Current Science

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Earth’s gravitational field, its shape and orientation in the space are the ‘three pillars of geodesy’1,2. In recent times, geodesy has emerged as an interdisciplinary domain in geophysics, which includes tectonics, internal structure of the earth, seismology, hydrology, glaciology, oceanography, meteorology, atmospheric physics, climate science, etc.1. In fact, it has found several applications in earth sciences that a new subject ‘tectonic geodesy’ has evolved, which specifically deals with the application of geodetic techniques in understanding tectonic processes by estimating surface velocity field within tectonically active regions. This technique provides constraints on the spatio-temporal distribution of the lithospheric deformation and surface plate kinematics by exploiting various space-based geodetic techniques (e.g. Global Positioning System (GPS), Very Long Baseline Interferometry (VLBI), Interferometric Synthetic Aperture Radar (InSAR), Doppler Orbitography and Radio positioning Integrated by Satellite (DORIS) and Satellite Laser Ranging (SLR)).
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