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[Describes all reports prepared from fiscal years 1962-72.]
The report discusses: the current state of knowledge concerning the physical character of the distinct zones of disturbance surrounding a nuclear or high explosive crater, the scope and techniques of engineering properties investigations at the sites of cratering experiments, and methods for predicting the character of crater zones from the results of predetonation investigations. Information contained in this report is based on data obtained from craters produced in dry materials. (Author).
The report presents the results of preshot and postshot geologic and engineering properties investigations performed in conjunction with the Project Pre-Gondola I cratering experiment series. The Pre-Gondola I series consisted of the detonation of four 20-ton HE charges at varying depths of burst in highly over-consolidated Bearpaw clay shale at Fort Peck, Montana. Detailed surface and subsurface postshot investigations were conducted at the Bravo crater. Surface postshot investigations only were conducted at the other crater sites. (Author).