APPLICATION OF GEOTOMOGRAPHY AT THE MONKS HOLLOW DAMSITE, UTAH Phil Sines Seismotectonics and Geophysics Section U.S. Bureau of Reclamation Denver, CO, 89225 Abstract An integrated seismic investigation at the Monks hollow damsite demonstrated the importance of concomitant field engineering studies and wide-aperture geophysical testing to assess, define, and quantify the lateral and vertical extent of variable rock strength present in an abutment for a proposed arch dam. Seismic common offset, refraction and tomography surveys were conducted within the right abutment adit and on the ground surface. The surveys defined the lateral extent of low moduli rock, associated with jointing, faulting, and poor cementation; and also identified the presence of high moduli material, indic

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