Abstract
A remote sensing geophysical method is needed to properly characterize the void and chimney characteristics of underground nuclear tests. Various techniques were considered and a seismic reflection survey was selected. This survey was then fitted to the conditions at the test site so as to give optimum results. The data was then reduced via DOS computer and analyzed for content. The planned survey using a 50 ft offset did not show any useful information, however, a second survey with a variable longer offset was also conducted which was capable of determining the depth to the top and the bottom of the chimney with reasonable accuracy. Measurements of the horizontal spread of the structure, though, were inconclusive.
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