East African rift - map view of region where a new extensional plate boundary is forming
Valles caldera - SIR-C radar image of N. New Mexico - Note: large caldera in Jemez Mtns., NNW trending fault, and Rio Grande R. (red color = vegetation)
Valles caldera - diagramatic cross sections showing evolution of a caldera structure
Ash distribution - for major explosive eruptions in the W. US: Yellowstone (1900 ka b.p.), Long Valley (700 ka), Crater Lake (7 ka), and Mt. St. Helens (1980) (ka = 1000 years)