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8th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
- Conference date: 23 Apr 1995 - 26 Apr 1995
- Location: Orlando, Florida, Canada
- Published: 23 April 1995
101 - 104 of 104 results
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High Resolution Seismic Reflection Test At The Doe Hanford Site
Authors S.M. Narbutovskih, F.B. Michelser, J.C. Clark and E.W. ChristensenA recent test was conducted to ascertain the benefits of swept source technology for use at the DOE Hanford Site.
Previous high resolution seismic surveys suf?ered from coherent noise interference, poor signal transmission and lack of
borehole velocity control. P-wave data were collected with the T-2500 Minivib produced by IVI, Inc. and Oyo
Geospace’s DAS- 1 acquisition system. Results showed a significant increase in signal-to-noise ratio, increased
resolving power and better depth penetration of the signal. It is concluded that swept source technology as part of a total
systems approach, significantly expands the capabilities of the shallow high resolution seismic reflection method for use
at the DOE Hanford Site.
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Automatic Recognition Of Hyperbolic Patterns In Underground Cross-Sectional Images
Authors Yuji Nagashima, Hiroto Saito, Shigeru Kobayashi and Jun-ichi MasudaThis paper describes a method for automatically recognizing buried pipes. The amplitudes of reflected pulse-radar signals are converted to 1, 0, or -1 according to the peak points of the signal,
thereby converting the underground cross-sectional image into a line image. The hyperbolic patterns created by underground pipes are made automatically recognizable by trace and addition
processing. Underground pipes can be easily located.
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Ves-Field And Processing Technology For The Case Of High Level Geological Noise
Authors V.A. Shevnin, A.A. Bobachev, I.N. Modin and E.V. PervagoMany publications in last several years were devoted to the new technology in resistivity method, called as Electrical Imaging (R.Barker) or Resistivity Tomography (H.Shima). In MSU from 1980 the similar investigation was carried out for VES technology called The total electric sounding (TES). In each separate case the TES field technology aims the investigation of a depth interval from h min up to h max. The horizontal size of any object to be visible should be approximately equal of its depth (Fig.1). The step on the profile for detailed investigation of the such object should be 2-5 times smaller of its size.
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Rabbit Valley Geophysics Performance Evaluation Range
More LessThe U.S. Department of Energy (DOE) Grand Junction Projects Office (GJPO) has provided a facility for DOE,
other Government agencies, and the private sector to evaluate and document the utility of specific geophysical
measurement techniques for detecting and defining cultural and environmental targets. This facility is the Rabbit
Valley Geophysics Performance Evaluation Range (GPER), which includes test cells in the high-desert terrain of
Rabbit Valley, 30 miles west of Grand Junction, Colorado, and test cells and calibration models at the DOE-GJPO
facility in Grand Junction. Figures 1 and 2 provide an overview of Rabbit Valley, which is readily accessible from
Interstate 70 but is isolated from the effects of cultural activities and structures.
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