  This study examines the feasibility of the full-field ultrasonic
characterization of fractures in rock. To this end, a slab-like specimen of
granite is subjected to in-plane, O(10$^4$Hz) excitation while monitoring the
induced 2D wavefield by a Scanning Laser Doppler Vibrometer (SLDV) with
sub-centimeter spatial resolution. Upon suitable filtering and interpolation,
the observed wavefield is verified to conform with the plane-stress
approximation and used to: (i) compute the maps of elastic modulus in the
specimen (before and after fracturing) via a rudimentary application of the
principle of elastography; (ii) reconstruct the fracture geometry; (iii) expose
the fracture's primal (traction-displacement jump) contact behavior, and (iv)
identify its profiles of shear and normal specific stiffness. Through the use
of full-field ultrasonic data, the approach provides an unobscured,
high-resolution insight into the fracture's contact behavior, foreshadowing
in-depth laboratory exploration of interdependencies between the fracture
geometry, aperture, interphase properties, and its seismic characteristics.
