Figure F6. An example of shear wave field with relatively high coherency in the bottom part of Hole1256D (sheeted dike section). The first track on the left shows borehole diameter recorded by two orthogonal calipers. Rotated fast and slow shear wave fields are shown in the middle, along with corresponding coherency plots of shear-wave arrivals. Shear slowness: black = compressional slownesses. Slow and fast slownesses are very similar, thus, suggesting isotropic formation. Fast-shear azimuth (red; determined by Alford rotation): gray = uncertainty.
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