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Seismic Imaging of Shallow Depths using Ambient Noise Tomography in the Hyderabad Region, Eastern Dharwar Craton, India.

Hyderabad and its surrounding region, situated within Eastern Dharwar Craton, are primarily composed of Archean granite. The 3D shallow subsurafce shear velocity image of 150 x 200 sq. km area around Hyderabad, using Ambient noise tomography, indicates that the subsurface velocity structure is heterogenous. The limited seismicity in the area is observed to be mostly confined to the boundary between high and low velocity changes.

Elevation map of Hyderabad and surrounding region, India showing the seismic network of 10 broadband seismic stations (Black filled triangles). Black lines mark faults and lineaments in the area (Singh et al., 2004). The inset map shows the study region (black box) in the map of India.

Shear velocity variations in plan view at different depth (5 km, 6 km, 7 km, 8 km, and 9 km). The red stars mark the locations of earthquake recorded at respective depths within ±500 m (Mandal et al., 2022b). The shear velocity variation scale is shown at the bottom of the plot.

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