Fig. 4
Isotropic shear wave velocity anomalies (a,c,e) and shear wave radial anisotropy (b,d,f) in lateral sections from surface down to 5 km depth and the outline of cross sections in a spatial map (g). \(V_s\) radial aniso. In (b,d,f) refers to shear wave radial anisotropy. The Koyna reservoir location is denoted with “K” and the warna reservoir locations are denoted with “W” on the top of the cross-sections. The seismicity in the area in 1967–2017 period8,9,10 within 1.25 km of the cross-sections has been plotted on top and color coded by their date of occurrence. The contour in (a) highlights linked negative \(V_s\) anomalies from surface down to greater depths connecting the two reservoirs. The focal mechanisms have been projected based on the orientations of the vertical planes. The maps in this figure were generated using Python-v3.8.18 scripts with MSNoise-v1.3 and MSNoise-Tomo44, swprepost-v2.0.045, Geopsy-v3.4.046, and pygmt-v0.911, and combined using Inkscape-v1.2.212.
