Thomas J Casadevall
Tom Casadevall is a Scientist Emeritus with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
Filter Total Items: 39
Recent uplift and hydrothermal activity at Tangkuban Parahu volcano, west Java, Indonesia Recent uplift and hydrothermal activity at Tangkuban Parahu volcano, west Java, Indonesia
Tangkuban Parahu is an active stratovolcano located 17 km north of the city of Bandung in the province west Java, Indonesia. All historical eruptive activity at this volcano has been confined to a complex of explosive summit craters. About a dozen eruptions-mostly phreatic events- and 15 other periods of unrest, indicated by earthquakes or increased thermal activity, have been noted...
Authors
J. Dvorak, J. Matahelumual, A.T. Okamura, H. Said, T. J. Casadevall, D. Mulyadi
Evaluation of gas data from high-temperature fumaroles at Mount St. Helens, 1980-1982 Evaluation of gas data from high-temperature fumaroles at Mount St. Helens, 1980-1982
The Mount St. Helens fumarole gases show linear composition trends during periods of noneruptive degassing between September 1980 and October 1981. The trends are characterized by increasing H2O and decreasing CO2 and sulfur. Maximum fumarole temperatures also show a linear decrease during this period. High-temperature fumarole gases collected from the crater and dome between September...
Authors
T.M. Gerlach, T. J. Casadevall
Fumarole emissions at Mount St. Helens volcano, June 1980 to October 1981: Degassing of a magma-hydrothermal system Fumarole emissions at Mount St. Helens volcano, June 1980 to October 1981: Degassing of a magma-hydrothermal system
This study is an investigation of the chemical changes in the Mount St. Helens fumarole gases up to October 1981, the sources of the fumarole gases, and the stability of gas species in the shallow magma system. These problems are investigated by calculations of element compositions, thermodynamic equilibria, and magmatic volatile-hydrothermal steam mixing models. The fumarole gases are...
Authors
T.M. Gerlach, T. J. Casadevall
Forecasts and predictions of eruptive activity at Mount St. Helens, USA: 1975-1984 Forecasts and predictions of eruptive activity at Mount St. Helens, USA: 1975-1984
Public statements about volcanic activity at Mount St. Helens include factual statements, forecasts, and predictions. A factual statement describes current conditions but does not anticipate future events. A forecast is a comparatively imprecise statement of the time, place, and nature of expected activity. A prediction is a comparatively precise statement of the time, place, and ideally...
Authors
D. A. Swanson, T. J. Casadevall, D. Dzurisin, R. T. Holcomb, C. G. Newhall, S. D. Malone, C.S. Weaver
Sulfur dioxide and particles in quiescent volcanic plumes from Poás, Arenal, and Colima Volcanos, Costa Rica and Mexico Sulfur dioxide and particles in quiescent volcanic plumes from Poás, Arenal, and Colima Volcanos, Costa Rica and Mexico
Measurements of SO2 emission rates and concentrations and of particle distribution, size, shape, and composition were made in quiescent volcanic plumes emitted into the troposphere from Poás and Arenal volcanos, Costa Rica, and Colima volcano, Mexico. SO2 emission rates were 700±180 metric tons per day (t/d) for Poás, 210±30 t/d for Arenal, and 320±50 t/d for Colima. The concentrations...
Authors
T. J. Casadevall, William I. Rose, William H. Fuller, William H. Hunt, Mark A. Hart, Jarvis L. Moyers, David C. Woods, Raymond L. Chuan, James P. Friend
A Catalogue of drill core recovered from Kilauea Iki lava lake from 1967 to 1979 A Catalogue of drill core recovered from Kilauea Iki lava lake from 1967 to 1979
No abstract available.
Authors
Rosalind Tuthill Helz, N.G. Banks, T. J. Casadevall, R.S. Fiske, R. B. Moore
Science and Products
Filter Total Items: 39
Recent uplift and hydrothermal activity at Tangkuban Parahu volcano, west Java, Indonesia Recent uplift and hydrothermal activity at Tangkuban Parahu volcano, west Java, Indonesia
Tangkuban Parahu is an active stratovolcano located 17 km north of the city of Bandung in the province west Java, Indonesia. All historical eruptive activity at this volcano has been confined to a complex of explosive summit craters. About a dozen eruptions-mostly phreatic events- and 15 other periods of unrest, indicated by earthquakes or increased thermal activity, have been noted...
Authors
J. Dvorak, J. Matahelumual, A.T. Okamura, H. Said, T. J. Casadevall, D. Mulyadi
Evaluation of gas data from high-temperature fumaroles at Mount St. Helens, 1980-1982 Evaluation of gas data from high-temperature fumaroles at Mount St. Helens, 1980-1982
The Mount St. Helens fumarole gases show linear composition trends during periods of noneruptive degassing between September 1980 and October 1981. The trends are characterized by increasing H2O and decreasing CO2 and sulfur. Maximum fumarole temperatures also show a linear decrease during this period. High-temperature fumarole gases collected from the crater and dome between September...
Authors
T.M. Gerlach, T. J. Casadevall
Fumarole emissions at Mount St. Helens volcano, June 1980 to October 1981: Degassing of a magma-hydrothermal system Fumarole emissions at Mount St. Helens volcano, June 1980 to October 1981: Degassing of a magma-hydrothermal system
This study is an investigation of the chemical changes in the Mount St. Helens fumarole gases up to October 1981, the sources of the fumarole gases, and the stability of gas species in the shallow magma system. These problems are investigated by calculations of element compositions, thermodynamic equilibria, and magmatic volatile-hydrothermal steam mixing models. The fumarole gases are...
Authors
T.M. Gerlach, T. J. Casadevall
Forecasts and predictions of eruptive activity at Mount St. Helens, USA: 1975-1984 Forecasts and predictions of eruptive activity at Mount St. Helens, USA: 1975-1984
Public statements about volcanic activity at Mount St. Helens include factual statements, forecasts, and predictions. A factual statement describes current conditions but does not anticipate future events. A forecast is a comparatively imprecise statement of the time, place, and nature of expected activity. A prediction is a comparatively precise statement of the time, place, and ideally...
Authors
D. A. Swanson, T. J. Casadevall, D. Dzurisin, R. T. Holcomb, C. G. Newhall, S. D. Malone, C.S. Weaver
Sulfur dioxide and particles in quiescent volcanic plumes from Poás, Arenal, and Colima Volcanos, Costa Rica and Mexico Sulfur dioxide and particles in quiescent volcanic plumes from Poás, Arenal, and Colima Volcanos, Costa Rica and Mexico
Measurements of SO2 emission rates and concentrations and of particle distribution, size, shape, and composition were made in quiescent volcanic plumes emitted into the troposphere from Poás and Arenal volcanos, Costa Rica, and Colima volcano, Mexico. SO2 emission rates were 700±180 metric tons per day (t/d) for Poás, 210±30 t/d for Arenal, and 320±50 t/d for Colima. The concentrations...
Authors
T. J. Casadevall, William I. Rose, William H. Fuller, William H. Hunt, Mark A. Hart, Jarvis L. Moyers, David C. Woods, Raymond L. Chuan, James P. Friend
A Catalogue of drill core recovered from Kilauea Iki lava lake from 1967 to 1979 A Catalogue of drill core recovered from Kilauea Iki lava lake from 1967 to 1979
No abstract available.
Authors
Rosalind Tuthill Helz, N.G. Banks, T. J. Casadevall, R.S. Fiske, R. B. Moore