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Reflections from several horizons shallower than 50 ft were recorded by seismic reflection methods at the Denver Federal Center in Lakewood, Colorado, by the U.S. Geological Survey in March 1985. Subsurface horizons at depths of 12, 21, 33, and 54 ft produced reflections at 16, 20, 26, and 31 ms, respectively. Refraction, drilling cores, and downhole seismic work provided velocity and depth information that helped identify events on the reflection data. Seismic and drilling investigations allowed construction of a subsurface seismic reflection model. Tests of this model using Geoquest International's Advanced Interpretive Modeling System (AIMS) further substantiated the interpretation of the reflection data. The seismic reflection work shows successful recovery of subsurface data from depths as shallow as 12 ft with decreasing precision below 30-50 ft for this site. Maximum depths of reliable reflections from subsurface interfaces were 55 ft. The maximum depth drilling was 60 ft. Accuracy of the calculations made from the reflection data are within jl ft for reflection events at depths of 12 and 20 ft. The accuracy deteriorated to j5 ft for reflection events below a 35-ft depth.

A high-resolution seismic reflection investigation of shallow horizons at the Denver Federal Center, Lakewood, Colorado