Manuel Nathenson

Work on probabilities of volcanic eruptions used for hazard assessments of Yellowstone, Medicine Lake volcano, Lassen volcanic center, and Crater Lake caldera. Studies with Judy Fierstein on methods of calculating volumes of tephra layers were published and applied to reevaluation of volumes of large tephra eruptions in the Cascades. Work on chemistry of slightly thermal springs with Mike Thompson and Bob Mariner on volcanoes published for Mount Adams, Mount Hood, Mount Shasta, and Crater Lake. A series of studies were done at Crater Lake to provide input to the Department’s decision making on the existence of a significant thermal feature in Crater Lake. Served as USGS representative for DOI issues on significant thermal features in national parks. Coordinated studies in the USGS for input to the U.S. DOE Hawaii Geothermal Project Environmental Impact Statement. Worked on heat flow studies of various areas for the study of geothermal systems and ran a drilling program at Raft River, Idaho, with Thomas Urban. Developed methodology to analyze recoverability for assessments of geothermal resources in the U.S. Prepared a map with Marianne Guffanti of geothermal gradients to 2 km depth in the U.S.