Physics – Geophysics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3707405s&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 7, CiteID L07405
Physics
Geophysics
Hydrology: Hydrogeophysics, Exploration Geophysics: Seismic Methods (3025, 7294), Seismology: General Or Miscellaneous
Scientific paper
We collected ultra-shallow seismic-reflection data to image the near-surface stratigraphy of a Kansas River point bar. We were successful in identifying a discontinuous clay layer and the top of the saturated zone at depths of 0.95 and 1.4 m. Seismic walkaway data collected using various .22-caliber ammunition show that decreased source energy is necessary to generate higher frequencies and prevent clipping of critical near-offset traces needed to identify ultra-shallow reflections. The seismic reflections exhibited average normal moveout velocities of 180-195 m/s with dominant frequencies of 200-450 Hz. Coincident subsurface features were also imaged using 200-MHz ground-penetrating radar. This study presents the shallowest seismic reflection from the top of the saturated zone reported in the literature to date and further demonstrates the potential of using seismic-reflection methods for ultra-shallow imaging of the subsurface as a stand-alone tool or in conjunction with other high-resolution geophysical techniques.
Sloan Steven D.
Steeples Don W.
Tsoflias Georgios P.
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