Application Of Geotomography At The Monks Hollow Damsite, Utah

An integrated seismic investigation at the Monks hollow damsite demonstrated the<br>importance of concomitant field engineering studies and wide-aperture geophysical testing<br>to assess, define, and quantify the lateral and vertical extent of variable rock strength<br>present in an abutment for a proposed arch dam. Seismic common offset, refraction and<br>tomography surveys were conducted within the right abutment adit and on the ground<br>surface. The surveys defined the lateral extent of low moduli rock, associated with<br>jointing, faulting, and poor cementation; and also identified the presence of high moduli<br>material, indicative of well cemented and unfractured rock.