Publications
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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
Magmatic vapor source for sulfur dioxide released during volcanic eruptions: Evidence from Mount Pinatubo Magmatic vapor source for sulfur dioxide released during volcanic eruptions: Evidence from Mount Pinatubo
Sulfur dioxide (SO2) released by the explosive eruption of Mount Pinatubo on 15 June 1991 had an impact on climate and stratospheric ozone. The total mass of SO2 released was much greater than the amount dissolved in the magma before the eruption, and thus an additional source for the excess SO2 is required. Infrared spectroscopic analyses of dissolved water and carbon dioxide in glass...
Authors
P.J. Wallace, T.M. Gerlach
Campground talk and slide show on volcanoes for Chiricahua National Monument Campground talk and slide show on volcanoes for Chiricahua National Monument
The slides and the accompanying script presented here are based on a campground presentation at Chiricahua National Monument in 1994. Examples of eruptions at active volcanoes are used to help the audience visualize events that took place in the National Monument 27 million years ago. This presentation stresses the following themes: 1) The National Monument lies on the flank of an...
Authors
J.S. Pallister, E. A. Du Bray
Multiple flow processes accompanying a dam-break flood in a small upland watershed, Centralia, Washington Multiple flow processes accompanying a dam-break flood in a small upland watershed, Centralia, Washington
On October 5, 1991, following 35 consecutive days of dry weather, a 105-meter long, 37-meter wide, 5.2-meter deep concrete-lined watersupply reservoir on a hillside in the eastern edge of Centralia, Washington, suddenly failed, sending 13,250 cubic meters of water rushing down a small, steep tributary channel into the city. Two houses were destroyed, several others damaged, mud and...
Authors
John E. Costa
Measurements of heat and mass flow from thermal areas in Lassen Volcanic National Park, California, 1984-93 Measurements of heat and mass flow from thermal areas in Lassen Volcanic National Park, California, 1984-93
Rates of heat loss from eight steam-heated thermal areas and one conductively heated thermal area in Lassen Volcanic National Park have been determined from measurements made during the period 1984-93. Total heat discharge at the steam-heated areas is assumed proportional to the rate of steam upflow from underlying reservoirs. The dominant mode of heat loss differs among the areas...
Authors
Michael L. Sorey, Elizabeth M. Colvard
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
Unusual ice diamicts emplaced during the December 15, 1989 eruption of Redoubt volcano, Alaska Unusual ice diamicts emplaced during the December 15, 1989 eruption of Redoubt volcano, Alaska
Ice diamict comprising clasts of glacier ice and subordinate rock debris in a matrix of ice (snow) grains, coarse ash, and frozen pore water was deposited during the eruption of Redoubt Volcano on December 15, 1989. Rounded clasts of glacier ice and snowpack are as large as 2.5 m, clasts of Redoubt andesite and basement crystalline rocks reach 1 m, and tabular clasts of entrained...
Authors
R. B. Waitt, C. A. Gardner, T.C. Pierson, J. J. Major, C.A. Neal
Uranium-Series Ages of Travertines and Timing of the Last Glaciation in the Northern Yellowstone Area, Wyoming-Montana Uranium-Series Ages of Travertines and Timing of the Last Glaciation in the Northern Yellowstone Area, Wyoming-Montana
Uranium-series age determinations by mass spectrometric methods were done for travertines and associated carbonate veins related to clastic deposits of the last glaciation (Pinedale) in the northern Yellowstone area. Dramatic variations in the hydrologic head are inferred from variations in the elevation of travertine deposition with time and are consistent with the expected hydrologic...
Authors
N.C. Sturchio, K. L. Pierce, M.T. Murrell, M.L. Sorey
Potassium-argon geochronology of a basalt-andesite-dacite arc system: the Mount Adams volcanic field, Cascade Range of southern Washington Potassium-argon geochronology of a basalt-andesite-dacite arc system: the Mount Adams volcanic field, Cascade Range of southern Washington
High-precision K-Ar dating and detailed mapping have established an eruptive chronology for a Cascade stratovolcano and its surrounding array of coeval basaltic centers. The time-volume-composition data bear upon several fundamental questions concerning the long-term behavior of arc volcanoes. -from Authors
Authors
W. Hildreth, M. A. Lanphere
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
Analysis of deep seismic reflection and other data from the southern Washington Cascades Analysis of deep seismic reflection and other data from the southern Washington Cascades
No abstract available.
Authors
W. D. Stanley, S. Y. Johnson, V. F. Nuccio
An updated numerical simulation of the ground-water flow system for the Castle Lake debris dam, Mount St. Helens, Washington, and implications for dam stability against heave An updated numerical simulation of the ground-water flow system for the Castle Lake debris dam, Mount St. Helens, Washington, and implications for dam stability against heave
A numerical simulation of the ground-water flow system in the Castle Lake debris dam, calibrated to data from the 1991 and 1992 water years, was used to estimate factors of safety against heave and internal erosion. The Castle Lake debris dam, 5 miles northwest of the summit of Mount St. Helens, impounds 19,000 acre-ft of water that could pose a flood hazard in the event of a lake...
Authors
Evelyn A. Roeloffs