Don W. Steeples

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We describe a possible solution to the inverse refraction-traveltime problem ͑IRTP͒ that reduces the range of possible solutions ͑nonuniqueness͒. This approach uses a reference model, derived from surface-wave shear-wave velocity estimates , as a constraint. The application of the joint analysis of refractions with surface waves ͑JARS͒ method provided a(More)
Surface collapse over abandoned sub-surface coal mines continues to be a problem in many parts of the world. High-resolution P-wave reflection seismology was successfully used to evaluate the risk of an active sinkhole to a main north/south railroad line in an undermined area of southeastern Kansas. The water-filled cavities responsible for the sinkholes in(More)
The shear (S)-wave velocity of near-surface materials and its effect on seismic-wave propagation are of fundamental interest in many engineering, environmental, and groundwater studies. The multichannel analysis of surface wave (MASW) method provides a robust, efficient, and accurate tool to observe near-surface S-wave velocity. A recently developed device(More)
The Smart Weapons Test Range (SWTR) is a new facility constructed specifically for the development and testing of futuristic intelligent battlefield sensor networks within the Yuma Proving Ground (YPG), Arizona. In this paper, results are presented for an extensive high-resolution geophysical characterization study at the SWTR site along with validation(More)
Three distinct seismic reflections were obtained from within the upper 2.1 m of flood-plain alluvium in the Ar-kansas River valley near Great Bend, Kansas. Reflections were observed at depths of 0.63, 1.46, and 2.10 m and confirmed by finite-difference wave-equation modeling. The wavefield was densely sampled by placing geophones at 5-cm intervals, and(More)
High-resolution seismic reflections have been used effectively to investigate sinkholes resulting from the dissolution of a bedded salt unit found throughout most of central Kansas. A seismic reflection survey was conducted to investigate the shallow subsurface between a sinkhole that formed catastrophically within a few tens of meters of a main east/west(More)
Voids were imaged with greater detail using a diffraction imaging technique than with traditional seismic reflection processing. Subsurface voids in extensively mined areas pose a threat to human life and property. Seismic reflection techniques applied to the void detection problem have had limited success. Data acquired in July of 1985 over a former coal(More)
The fabric of the Precambrian geology of Kansas is revealed through inversion of gravity and magnetic data to pseudo-lithology. There are five main steps in the inversion process: (1) reduction of potential-field data to a horizontal plane in the wavenumber domain; (2) separation of the residual anomaly of interest from the regional background, where an(More)