A high-resolution seismic reflection and gravity survey of Quaternary deformation across the Wasatch Fault, Utah

摘要: High-resolution reflection seismic and detailed gravity data were acquired across an exposure of the Wasatch fault, Utah, near a trench excavated for dating Quaternary fault displacement. The are interpreted to show three subparallel surfaces dipping from 70°W at surface estimated 45°W 40 m, displaced unconsolidated sediments, colluvial material abutting main fault. Detailed assistance in mapping sediment-bedrock interface rangefront Fault Zone. A combined high-resolution interpretation reveals that bedrock is 80 m deeper hanging wall than footwall, suggesting displacement has occurred on several en echelon blocks near-surface Movement most recent trace began prior deposition Pleistocene lacustrine sediments. twelvefold, recorded processed achieve vertical resolution approximately 1 horizontal (Fresnel zone radii) as good 5 deepest reflecting interfaces m. Reasonably high frequencies bandwidth (about 80–300 Hz) stacked permitted direct comparison trenched cross section. Good correlation between stratigraphy structure suggests can be valuable tool analyzing faulting sediment locating potential sites.