The purpose of this investigation was to undertake a 1st Phase passive (blind test) seismic survey in Assam area in order to examine if the natural seismicity in the area is sufficient enough to provide a 3D Vp and Vp/Vs subsurface model via passive tomography (PST) and provide a course velocity and Vp/Vs model after 3 months of recording. The designed network spanned an area of 1900km2
The obtained Vp/Vs values < 1.7 for the entire block are presented in the figure below
Even though the network was operating for only 3 months the correlation of the PST data with the prevailing geological structures of the region was astonishing.
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