Mapping a bedrock surface under dry alluvium with shallow seismic reflections
Issue Date
1989-12-01Author
Miller, Richard D.
Steeples, Don W.
Brannan, Michael
Publisher
Society of Exploration Geophysicists
Type
Article
Article Version
Scholarly/refereed, publisher version
Metadata
Show full item recordAbstract
Shallow seismic‐reflection techniques were used to image the bedrock‐alluvial interface, near a chemical evaporation pond in the Texas Panhandle, allowing optimum placement of water‐quality monitor wells. The seismic data showed bedrock valleys as shallow as 4 m and accurate to within 1 m horizontally and vertically. The normal‐moveout velocity within the near‐surface alluvium varies from 225 m/s to 400 m/s. All monitor‐well borings near the evaporation pond penetrated unsaturated alluvial material. On most of the data, the wavelet reflected from the bedrock‐alluvium interface has a dominant frequency of around 170 Hz. Low‐cut filtering at 24 dB/octave below 220 Hz prior to analog‐to‐digital conversion enhanced the amplitude of the desired bedrock reflection relative to the amplitude of the unwanted ground roll. The final bedrock contour map derived from drilling and seismic‐reflection data possesses improved resolution and shows a bedrock valley not interpretable from drill data alone.
Description
This is the publisher's version, also available electronically from "http://library.seg.org".
ISSN
0016-8033Collections
- Geology Scholarly Works [247]
Citation
Richard D. Miller, Don W. Steeples, and Michael Brannan (1989). ”Mapping a bedrock surface under dry alluvium with shallow seismic reflections.” Geophysics, 54(12), 1528-1534. http://www.dx.doi.org/10.1190/1.1442620
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