BoMCRATR--a curved ray tomographic computer program for geophysical applications.
Tweeton DR; Jackson MJ; Roessler KS
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9411, 1992 Jan; :1-39
The U.S. Bureau of Mines has developed tomographic computer programs for geophysical applications and is distributing them as part of a Bureau plan to facilitate the transfer of technology to potential users. These programs were developed for predicting and monitoring the flow pattern of leach solution during in situ mining. The Bureau has also applied them to assessing high-wall blast damage and examining the integrity of mine-related geological structures. This report describes the curved ray program BoMCRATR (Bureau of Mines curved-ray tomographic reconstruction), tells how to run it, and gives examples with synthetic and field data. BoMcratr provides optional mathematical constraints to counteract the nonuniqueness of tomographic reconstructions with crosshole data. These constraints include limiting the maximum and minimum velocities, fixing the velocity at any point to any value, and establishing layers in which velocity does not vary with horizontal position. The user can test for nonuniqueness by varying the initial velocity pattern. The program can perform either curved or straight-ray analysis. Ray paths are calculated analytically in triangular pixels, which is faster than incremental numerical approximations.
Leaching; Data-processing; Ray-tracing; Mining-geology; Geophysics; Tomography; Computer-applications; In-situ-mining
IH; Report of Investigations
NTIS Accession No.
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9411