Publications
Filter Total Items: 3187
Preparing for the next eruption in the Cascades Preparing for the next eruption in the Cascades
No abstract available.
Authors
J.W. Ewert, B.M. Myers, S.R. Brantley
Volcanic activity and ground deformation hazard analysis for the Hawaii Geothermal Project environmental impact statement Volcanic activity and ground deformation hazard analysis for the Hawaii Geothermal Project environmental impact statement
No abstract available
Authors
James P. Kauahikaua, Richard B. Moore, Paul T. Delaney
Video of the August 18, 1992, eruption of Crater Peak vent on Spurr Volcano, Alaska Video of the August 18, 1992, eruption of Crater Peak vent on Spurr Volcano, Alaska
No abstract available.
Authors
Robert G. McGimsey, Joseph M. Dorava
A compilation of sulfur dioxide and carbon dioxide emission-rate data from Mount St. Helens during 1980-88 A compilation of sulfur dioxide and carbon dioxide emission-rate data from Mount St. Helens during 1980-88
Airborne monitoring of Mount St. Helens by the USGS began inMay 1980 for sulfur dioxide emissions and in July 1980 forcarbon dioxide emissions. A correlation spectrometer, orCOSPEC, was used to measure sulfur dioxide in Mount St.Helens' plume. The upward-looking COSPEC was mounted in afixed-wing aircraft and flown below and at right angles to theplume. Typically, three to six traverses...
Authors
Kenneth A. McGee, Thomas J. Casadevall
Major-element, trace-element, and volatile concentrations in silicate melt inclusions from the tuff of Pine Grove, Wah Wah Mountains, Utah Major-element, trace-element, and volatile concentrations in silicate melt inclusions from the tuff of Pine Grove, Wah Wah Mountains, Utah
No abstract available.
Authors
Jacob B. Lowenstern, Charles R. Bacon, L. C. Calk, R.L. Hervig, R.D. Aines
Tapping the Earth's natural heat Tapping the Earth's natural heat
T he Earth is a bountiful source of heat. It continuously produces heat at depth, primarily by the decay of naturally radioactive chemical elements (principally uranium, thorium, and potassium) that occur in small amounts in all rocks. This deep heat then rises toward the cooler surface, where scientists can measure the rate of its escape through the Earth's crust. The annual heat loss...
Authors
Wendell A. Duffield, J.H. Sass, M.L. Sorey
Abstracts of the eighth international conference on Geochronology, cosmochronology, and isotope geology Abstracts of the eighth international conference on Geochronology, cosmochronology, and isotope geology
No abstract available.
Authors
Marvin A. Lanphere, G. Brent Dalrymple, Brent D. Turrin
Deformation from 1973 to 1987 in the epicentral area of the 1959 Hebgen Lake, Montana, earthquake (Ms = 7.5) Deformation from 1973 to 1987 in the epicentral area of the 1959 Hebgen Lake, Montana, earthquake (Ms = 7.5)
A 40‐km aperture trilateration network centered on the 1959 Hebgen Lake earthquake epicenter has been surveyed in 1973, 1974, 1976, 1978, 1981, 1984, and 1987. The deformation inferred from those surveys is described roughly by a uniaxial, 0.266 ± 0.014 μstrain/yr, N15°E ± 1°extension that is uniform in both time and space. That extension is orthogonal to the strike (N78°W ± 5°) of the...
Authors
James C. Savage, Michael Lisowski, W.H. Prescott, A.D. Pitt
Klamath Falls earthquakes, September 20, 1993 — Including the strongest quake ever measured in Oregon Klamath Falls earthquakes, September 20, 1993 — Including the strongest quake ever measured in Oregon
Earthquakes struck the Klamath Falls area on Monday night, September 20, 1993, resulting in two deaths and extensive damage. The quakes were felt as far away as Coos Bay to the west, Eugene to the north, Lakeview to the east, and Chico, California, to the south. A foreshock recorded at 8:16 p.m. had a Richter magnitude of 3.9. The first of two main shocks, measuring 5.9 on the Richter...
Authors
T. J. Wiley, David R. Sherrod, David K. Keefer, Anthony Qamar, Robert L. Schuster, James W. Dewey, Matthew A. Mabey, Gerald L. Black, Ray E. Wells
Evolution of the caldera‐forming eruption at Crater Lake, Oregon, indicated by component analysis of lithic fragments Evolution of the caldera‐forming eruption at Crater Lake, Oregon, indicated by component analysis of lithic fragments
Crater Lake caldera (8 × 10 km), formed 6845 years B. P. (14C age) during the climactic eruption of the volcanic edifice known as Mount Mazama, is intermediate in size between small calderas associated with central vent eruptions and large calderas that have ring fracture vent systems. Our quantitative study of lithic fragments in the ejecta confirms the existing model of changes in vent
Authors
K. Suzuki-Kamata, H. Kamata, Charles R. Bacon
Anatomy of a basaltic volcano Anatomy of a basaltic volcano
Kilauea volcano, in Hawaii, may be the best understood basaltic volcano in the world. Magma rises from a depth of 80 km or more and resides temporarily in near-surface reservoirs: eruption begins when the crust above one of these reservoirs splits open in response to a pressure increase. Repeated rift-zone eruptions compress Kilauea's flanks; after decades of accumulation, the stress is...
Authors
Robert I. Tilling, J.J. Dvorak