Method for obtaining confidence-limit values for seismic velocities calculated from Vibroseis data
An equation is derived to calculate the confidence-limit values associated with seismic velocities calculated from time and distance data obtained using the Vibroseis method. This derived equation is a function of the uncertainty in the time measurement. Sources of timing uncertainty in the Vibroseis method are examined and estimates of the timing uncertainty are made. These estimates of the uncertainty in the time measurement are used to calculate the confidence-limit values associated with calculated velocities. A nomograph has been constructed to provide quick approximation of these confidence-limit values. The Vibroseis method is used in the nuclear weapons testing program to determine seismic velocities in various areas at the Nevada Test Site. These seismic velocities are used as parameters in ground motion and cavity growth models and as indicators of possible high acoustic-impedance boundaries. It is important to have some estimate of the uncertainty associated with these seismic velocities.
- Research Organization:
- Geological Survey, Denver, Colo. (USA)
- DOE Contract Number:
- EY-76-A-08-0474
- OSTI ID:
- 5086799
- Report Number(s):
- USGS-474-255
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Terrestrial-- Site Resource & Use Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
58 GEOSCIENCES
580201* -- Geophysics-- Seismology & Tectonics-- (1980-1989)
ACCURACY
DIAGRAMS
EQUATIONS
EXPLOSIONS
MEASURING METHODS
NEVADA TEST SITE
NOMOGRAMS
PERFORMANCE TESTING
SEISMIC DETECTORS
SEISMIC WAVES
TESTING
TIME DEPENDENCE
UNDERGROUND EXPLOSIONS
VELOCITY