Bill Evans, PhD (Former Employee)
Science and Products
Filter Total Items: 110
Gas and isotope chemistry of thermal features in Yellowstone National Park, Wyoming Gas and isotope chemistry of thermal features in Yellowstone National Park, Wyoming
This report presents 130 gas analyses and 31 related water analyses on samples collected from thermal features at Yellowstone between 2003 and 2009. An overview of previous studies of gas emissions at Yellowstone is also given. The analytical results from the present study include bulk chemistry of gases and waters and isotope values for water and steam (delta18O, dealtaD), carbon...
Authors
D. Bergfeld, Jacob B. Lowenstern, Andrew G. Hunt, W.C. Pat Shanks, William Evans
Monitoring CO2 emissions in tree kill areas near the resurgent dome at Long Valley Caldera, California Monitoring CO2 emissions in tree kill areas near the resurgent dome at Long Valley Caldera, California
We report results of yearly measurements of the diffuse CO2 flux and shallow soil temperatures collected since 2006 across two sets of tree-kill areas at Long Valley Caldera, California. These data provide background information about CO2 discharge during a period with moderate seismicity, but little to no deformation. The tree kills are located at long-recognized areas of weak thermal...
Authors
D. Bergfeld, William C. Evans
Carbon isotope composition of CO2 at Cascade Arc volcanoes Carbon isotope composition of CO2 at Cascade Arc volcanoes
No abstract available.
Authors
William C. Evans, Robert H. Mariner, Deborah Bergfeld, Kinga M. Revesz, John P. McGeehin
River solute fluxes reflecting active hydrothermal chemical weathering of the Yellowstone Plateau Volcanic Field, USA River solute fluxes reflecting active hydrothermal chemical weathering of the Yellowstone Plateau Volcanic Field, USA
In the past few decades numerous studies have quantified the load of dissolved solids in large rivers to determine chemical weathering rates in orogenic belts and volcanic areas, mainly motivated by the notion that over timescales greater than ~100kyr, silicate hydrolysis may be the dominant sink for atmospheric CO2, thus creating a feedback between climate and weathering. Here, we...
Authors
S. Hurwitz, William C. Evans, J. B. Lowenstern
Tree-ring 14C links seismic swarm to CO2 spike at Yellowstone, USA Tree-ring 14C links seismic swarm to CO2 spike at Yellowstone, USA
Mechanisms to explain swarms of shallow seismicity and inflation-deflation cycles at Yellowstone caldera (western United States) commonly invoke episodic escape of magma-derived brines or gases from the ductile zone, but no correlative changes in the surface efflux of magmatic constituents have ever been documented. Our analysis of individual growth rings in a tree core from the Mud...
Authors
William C. Evans, D. Bergfeld, J. P. McGeehin, J.C. King, H. Heasler
12th international symposium on water–rock interaction 12th international symposium on water–rock interaction
No abstract available.
Authors
William C. Evans, Russell S. Harmon, Richard B. Wanty
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
Gas and isotope chemistry of thermal features in Yellowstone National Park, Wyoming Gas and isotope chemistry of thermal features in Yellowstone National Park, Wyoming
This report presents 130 gas analyses and 31 related water analyses on samples collected from thermal features at Yellowstone between 2003 and 2009. An overview of previous studies of gas emissions at Yellowstone is also given. The analytical results from the present study include bulk chemistry of gases and waters and isotope values for water and steam (delta18O, dealtaD), carbon...
Authors
D. Bergfeld, Jacob B. Lowenstern, Andrew G. Hunt, W.C. Pat Shanks, William Evans
Monitoring CO2 emissions in tree kill areas near the resurgent dome at Long Valley Caldera, California Monitoring CO2 emissions in tree kill areas near the resurgent dome at Long Valley Caldera, California
We report results of yearly measurements of the diffuse CO2 flux and shallow soil temperatures collected since 2006 across two sets of tree-kill areas at Long Valley Caldera, California. These data provide background information about CO2 discharge during a period with moderate seismicity, but little to no deformation. The tree kills are located at long-recognized areas of weak thermal...
Authors
D. Bergfeld, William C. Evans
Carbon isotope composition of CO2 at Cascade Arc volcanoes Carbon isotope composition of CO2 at Cascade Arc volcanoes
No abstract available.
Authors
William C. Evans, Robert H. Mariner, Deborah Bergfeld, Kinga M. Revesz, John P. McGeehin
River solute fluxes reflecting active hydrothermal chemical weathering of the Yellowstone Plateau Volcanic Field, USA River solute fluxes reflecting active hydrothermal chemical weathering of the Yellowstone Plateau Volcanic Field, USA
In the past few decades numerous studies have quantified the load of dissolved solids in large rivers to determine chemical weathering rates in orogenic belts and volcanic areas, mainly motivated by the notion that over timescales greater than ~100kyr, silicate hydrolysis may be the dominant sink for atmospheric CO2, thus creating a feedback between climate and weathering. Here, we...
Authors
S. Hurwitz, William C. Evans, J. B. Lowenstern
Tree-ring 14C links seismic swarm to CO2 spike at Yellowstone, USA Tree-ring 14C links seismic swarm to CO2 spike at Yellowstone, USA
Mechanisms to explain swarms of shallow seismicity and inflation-deflation cycles at Yellowstone caldera (western United States) commonly invoke episodic escape of magma-derived brines or gases from the ductile zone, but no correlative changes in the surface efflux of magmatic constituents have ever been documented. Our analysis of individual growth rings in a tree core from the Mud...
Authors
William C. Evans, D. Bergfeld, J. P. McGeehin, J.C. King, H. Heasler
12th international symposium on water–rock interaction 12th international symposium on water–rock interaction
No abstract available.
Authors
William C. Evans, Russell S. Harmon, Richard B. Wanty
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.