A computational approach used for subsurface explosion cratering was extended to hypervelocity impact cratering. Meteor (Barringer) Crater, Arizona, was selected for the first computer simulation because it is one of the most thoroughly studied craters. It is also an excellent example of a simple, bowl-shaped crater and is one of the youngest terrestrial impact craters. Initial conditions for this calculation included a meteorite impact velocity of 15 km/s, meteorite mass of 1.67 x 10/sup 8/ kg, with a corresponding kinetic energy of 1.88 x 10/sup 16/ J (4.5 megatons). A two-dimensional Eulerian finite difference code called SOIL was used for this simulation of a cylindrical iron projectile impacting at normal incidence into a limestone target. For this initial calculation, a Tillotson equation-of-state description for iron and limestone was used with no shear strength. Results obtained for this preliminary calculation of the formation of Meteor Crater are in good agreement with field measurements. A color movie based on this calculation was produced using computer-generated graphics. 19 figures, 5 tables, 63 references.

Appendix containing tables to accompany a report on aerial gamma ray and magnetic survey of Raton Basin in Flagstaff Quadrangle in Arizona.

From Operations: For the Flagstaff quadrangle, a total of 1930 line miles, excluding reflights and overlaps and missing data were flown by the Tracker and 1348 line miles were flown by the helicopter. The production summary presented below and the detailed daily production in Appendix B describes half of the total project. The Raton Basin Project, of which this quadrangle is a part, covered five other 10 x 2 quadrangles which was or will be covered in separate reports.