Bill Evans, PhD (Former Employee)
Science and Products
Filter Total Items: 110
Hydrothermal activity and carbon-dioxide discharge at Shrub and upper Klawasi mud volcanoes, Wrangell Mountains, Alaska Hydrothermal activity and carbon-dioxide discharge at Shrub and upper Klawasi mud volcanoes, Wrangell Mountains, Alaska
Shrub mud volcano, one of three mud volcanoes of the Klawasi group in the Copper River Basin, Alaska, has been discharging warm mud and water and CO2?rich gas since 1996. A field visit to Shrub in June 1999 found the general level of hot-spring discharge to be similar, but somewhat more widespread, than in the previous two years. Evidence of recent animal and vegetation deaths from CO2...
Authors
Michael L. Sorey, Cindy Werner, Robert G. McGimsey, William C. Evans
Geochemistry and hydromechanical interactions of fluids associated with the San Andreas fault system, California Geochemistry and hydromechanical interactions of fluids associated with the San Andreas fault system, California
18O values establish that waters are predominantly of meteoric origin. The chemical compositions of water and gases are controlled mainly by the ambient rock types, and chemical geothermometry gives reservoir temperatures of 80-150 degrees C indicating shallow to moderate circulation depths of up to 6 km. However, compositions and isotope abundances of noble gases and delta 13C values of...
Authors
Yousif K. Kharaka, James J. Thordsen, William C. Evans, B. Mack Kennedy
Preliminary chemical and isotopic data for waters from springs and wells on and near Medicine Lake Volcano, Cascade Range, northern California Preliminary chemical and isotopic data for waters from springs and wells on and near Medicine Lake Volcano, Cascade Range, northern California
No abstract available.
Authors
Robert H. Mariner, William C. Evans, M. Huebner
Report on the 1997 activity of Shrub mud volcano, Wrangell-St. Elias National Park and Preserve, southcentral Alaska Report on the 1997 activity of Shrub mud volcano, Wrangell-St. Elias National Park and Preserve, southcentral Alaska
No abstract available.
Authors
D.H. Richter, R.B. Symonds, D. S. Rosenkrans, R. G. McGimsey, William C. Evans, R.J. Poreda
Carbon dioxide and helium emissions from a reservoir of magmatic gas beneath Mammoth Mountain, California Carbon dioxide and helium emissions from a reservoir of magmatic gas beneath Mammoth Mountain, California
Carbon dioxide and helium with isotopic compositions indicative of a magmatic source ( δ13C = −4.5 to −5‰, 3He/ 4He = 4.5 to 6.7 RA) are discharging at anomalous rates from Mammoth Mountain, on the southwestern rim of the Long Valley caldera in eastern California. The gas is released mainly as diffuse emissions from normal‐temperature soils, but some gas issues from steam vents or leaves...
Authors
M.L. Sorey, William C. Evans, B. M. Kennedy, C. D. Farrar, L.J. Hainsworth, B. Hausback
Investigations of gas seeps and springs in the vicinity of the gas rocks, south shore Becharof Lake, Alaska Investigations of gas seeps and springs in the vicinity of the gas rocks, south shore Becharof Lake, Alaska
No abstract available.
Authors
R.B. Symonds, B.E. Ritchie, R. G. McGimsey, M.H. Ort, R.J. Poreda, William C. Evans, C. J. Janik
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 110
Hydrothermal activity and carbon-dioxide discharge at Shrub and upper Klawasi mud volcanoes, Wrangell Mountains, Alaska Hydrothermal activity and carbon-dioxide discharge at Shrub and upper Klawasi mud volcanoes, Wrangell Mountains, Alaska
Shrub mud volcano, one of three mud volcanoes of the Klawasi group in the Copper River Basin, Alaska, has been discharging warm mud and water and CO2?rich gas since 1996. A field visit to Shrub in June 1999 found the general level of hot-spring discharge to be similar, but somewhat more widespread, than in the previous two years. Evidence of recent animal and vegetation deaths from CO2...
Authors
Michael L. Sorey, Cindy Werner, Robert G. McGimsey, William C. Evans
Geochemistry and hydromechanical interactions of fluids associated with the San Andreas fault system, California Geochemistry and hydromechanical interactions of fluids associated with the San Andreas fault system, California
18O values establish that waters are predominantly of meteoric origin. The chemical compositions of water and gases are controlled mainly by the ambient rock types, and chemical geothermometry gives reservoir temperatures of 80-150 degrees C indicating shallow to moderate circulation depths of up to 6 km. However, compositions and isotope abundances of noble gases and delta 13C values of...
Authors
Yousif K. Kharaka, James J. Thordsen, William C. Evans, B. Mack Kennedy
Preliminary chemical and isotopic data for waters from springs and wells on and near Medicine Lake Volcano, Cascade Range, northern California Preliminary chemical and isotopic data for waters from springs and wells on and near Medicine Lake Volcano, Cascade Range, northern California
No abstract available.
Authors
Robert H. Mariner, William C. Evans, M. Huebner
Report on the 1997 activity of Shrub mud volcano, Wrangell-St. Elias National Park and Preserve, southcentral Alaska Report on the 1997 activity of Shrub mud volcano, Wrangell-St. Elias National Park and Preserve, southcentral Alaska
No abstract available.
Authors
D.H. Richter, R.B. Symonds, D. S. Rosenkrans, R. G. McGimsey, William C. Evans, R.J. Poreda
Carbon dioxide and helium emissions from a reservoir of magmatic gas beneath Mammoth Mountain, California Carbon dioxide and helium emissions from a reservoir of magmatic gas beneath Mammoth Mountain, California
Carbon dioxide and helium with isotopic compositions indicative of a magmatic source ( δ13C = −4.5 to −5‰, 3He/ 4He = 4.5 to 6.7 RA) are discharging at anomalous rates from Mammoth Mountain, on the southwestern rim of the Long Valley caldera in eastern California. The gas is released mainly as diffuse emissions from normal‐temperature soils, but some gas issues from steam vents or leaves...
Authors
M.L. Sorey, William C. Evans, B. M. Kennedy, C. D. Farrar, L.J. Hainsworth, B. Hausback
Investigations of gas seeps and springs in the vicinity of the gas rocks, south shore Becharof Lake, Alaska Investigations of gas seeps and springs in the vicinity of the gas rocks, south shore Becharof Lake, Alaska
No abstract available.
Authors
R.B. Symonds, B.E. Ritchie, R. G. McGimsey, M.H. Ort, R.J. Poreda, William C. Evans, C. J. Janik
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.