Thomas J Casadevall
Tom Casadevall is a Scientist Emeritus with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
Filter Total Items: 39
Crater lake and post-eruption hydrothermal activity, El Chichón Volcano, Mexico 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...
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 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...
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 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...
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 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...
Authors
Thomas J. Casadevall, Richard W. Hazlett
Hydrogen gas monitoring at Long Valley Caldera, California 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 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...
Authors
H. Sakai, T. J. Casadevall, J.G. Moore
Science and Products
Filter Total Items: 39
Crater lake and post-eruption hydrothermal activity, El Chichón Volcano, Mexico 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...
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 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...
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 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...
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 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...
Authors
Thomas J. Casadevall, Richard W. Hazlett
Hydrogen gas monitoring at Long Valley Caldera, California 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 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...
Authors
H. Sakai, T. J. Casadevall, J.G. Moore