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
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 since 1829. Th
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
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 1980 and Ju
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
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 treated as
Authors
T.M. Gerlach, T. J. Casadevall
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, the natu
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
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 of SO2 calc
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
No abstract available.
Authors
Rosalind Tuthill Helz, N.G. Banks, T. J. Casadevall, R.S. Fiske, R. B. Moore
Crater lake and post-eruption hydrothermal activity, El Chichón Volcano, Mexico
Explosive eruptions of Volcán El Chichón in Chiapas, Mexico on March 28 and April 3–4, 1982 removed 0.2 km3 of rock to form a 1-km-wide 300-m-deep summit crater. By late April 1982 a lake had begun to form on the crater floor, and by November 1982 it attained a maximum surface area of 1.4 × 105 m2 and a volume of 5 × 106 m3. Accumulation of 4–5 m of rainfall between July and October 1982 largely f
Authors
Thomas J. Casadevall, Servando De la Cruz-Reyna, William I. Rose, Susan Bagley, David L. Finnegan, William H. Zoller
Gas emissions and the eruptions of Mount St. Helens through 1982
The monitoring of gas emissions from Mount St. Helens includes daily airborne measurements of sulfur dioxide in the volcanic plume and monthly sampling of gases from crater fumaroles. The composition of the fumarolic gases has changed slightly since 1980: the water content increased from 90 to 98 percent, and the carbon dioxide concentrations decreased from about 10 to 1 percent. The emission rate
Authors
T. Casadevall, W. Rose, T. Gerlach, L. P. Greenland, J. Ewert, R. Wunderman, R. Symonds
Predicting eruptions at Mount St. Helens, June 1980 through December 1982
Thirteen eruptions of Mount St. Helens between June 1980 and December 1982 were predicted tens of minutes to, more generally, a few hours in advance. The last seven of these eruptions, starting with that of mid-April 1981, were predicted between 3 days and 3 weeks in advance. Precursory seismicity, deformation of the crater floor and the lava dome, and, to a lesser extent, gas emissions provided t
Authors
D. A. Swanson, T. J. Casadevall, D. Dzurisin, S. D. Malone, C. G. Newhall, C.S. Weaver
Thermal areas on Kilauea and Mauna Loa Volcanoes, Hawaii
Active thermal areas are concentrated in three areas on Mauna Loa and three areas on Kilauea. High-temperature fumaroles (115-362°C) on Mauna Loa are restricted to the summit caldera, whereas high-temperature fumaroles on Kilauea are found in the upper East Rift Zone (Mauna Ulu summit fumaroles, 562°C), middle East Rift Zone (1977 eruptive fissure fumaroles), and in the summit caldera. Solfataric
Authors
Thomas J. Casadevall, Richard W. Hazlett
Hydrogen gas monitoring at Long Valley Caldera, California
No abstract available.
Authors
K.A. McGee, T. J. Casadevall, M. Sato, A. J. Sutton, M. D. Clark
Chemistry and isotope ratios of sulfur in basalts and volcanic gases at Kilauea volcano, Hawaii
Eighteen basalts and some volcanic gases from the submarine and subaerial parts of Kilauea volcano were analyzed for the concentration and isotope ratios of sulfur. By means of a newly developed technique, sulfide and sulfate sulfur in the basalts were separately but simultaneously determined. The submarine basalt has 700 ± 100 ppm total sulfur with δ34SΣs of ‰0.7 ± 0.1 ‰. The sulfate/sulfide mola
Authors
H. Sakai, T. J. Casadevall, J. G. Moore
Science and Products
Filter Total Items: 39
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 since 1829. Th
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
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 1980 and Ju
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
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 treated as
Authors
T.M. Gerlach, T. J. Casadevall
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, the natu
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
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 of SO2 calc
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
No abstract available.
Authors
Rosalind Tuthill Helz, N.G. Banks, T. J. Casadevall, R.S. Fiske, R. B. Moore
Crater lake and post-eruption hydrothermal activity, El Chichón Volcano, Mexico
Explosive eruptions of Volcán El Chichón in Chiapas, Mexico on March 28 and April 3–4, 1982 removed 0.2 km3 of rock to form a 1-km-wide 300-m-deep summit crater. By late April 1982 a lake had begun to form on the crater floor, and by November 1982 it attained a maximum surface area of 1.4 × 105 m2 and a volume of 5 × 106 m3. Accumulation of 4–5 m of rainfall between July and October 1982 largely f
Authors
Thomas J. Casadevall, Servando De la Cruz-Reyna, William I. Rose, Susan Bagley, David L. Finnegan, William H. Zoller
Gas emissions and the eruptions of Mount St. Helens through 1982
The monitoring of gas emissions from Mount St. Helens includes daily airborne measurements of sulfur dioxide in the volcanic plume and monthly sampling of gases from crater fumaroles. The composition of the fumarolic gases has changed slightly since 1980: the water content increased from 90 to 98 percent, and the carbon dioxide concentrations decreased from about 10 to 1 percent. The emission rate
Authors
T. Casadevall, W. Rose, T. Gerlach, L. P. Greenland, J. Ewert, R. Wunderman, R. Symonds
Predicting eruptions at Mount St. Helens, June 1980 through December 1982
Thirteen eruptions of Mount St. Helens between June 1980 and December 1982 were predicted tens of minutes to, more generally, a few hours in advance. The last seven of these eruptions, starting with that of mid-April 1981, were predicted between 3 days and 3 weeks in advance. Precursory seismicity, deformation of the crater floor and the lava dome, and, to a lesser extent, gas emissions provided t
Authors
D. A. Swanson, T. J. Casadevall, D. Dzurisin, S. D. Malone, C. G. Newhall, C.S. Weaver
Thermal areas on Kilauea and Mauna Loa Volcanoes, Hawaii
Active thermal areas are concentrated in three areas on Mauna Loa and three areas on Kilauea. High-temperature fumaroles (115-362°C) on Mauna Loa are restricted to the summit caldera, whereas high-temperature fumaroles on Kilauea are found in the upper East Rift Zone (Mauna Ulu summit fumaroles, 562°C), middle East Rift Zone (1977 eruptive fissure fumaroles), and in the summit caldera. Solfataric
Authors
Thomas J. Casadevall, Richard W. Hazlett
Hydrogen gas monitoring at Long Valley Caldera, California
No abstract available.
Authors
K.A. McGee, T. J. Casadevall, M. Sato, A. J. Sutton, M. D. Clark
Chemistry and isotope ratios of sulfur in basalts and volcanic gases at Kilauea volcano, Hawaii
Eighteen basalts and some volcanic gases from the submarine and subaerial parts of Kilauea volcano were analyzed for the concentration and isotope ratios of sulfur. By means of a newly developed technique, sulfide and sulfate sulfur in the basalts were separately but simultaneously determined. The submarine basalt has 700 ± 100 ppm total sulfur with δ34SΣs of ‰0.7 ± 0.1 ‰. The sulfate/sulfide mola
Authors
H. Sakai, T. J. Casadevall, J. G. Moore