WILLIAM C. EVANS

	U.S. Geological Survey MS #434 345 Middlefield Rd. Menlo Park, CA 94025 Tel: (650) 329-4514 wcevans@usgs.gov

Research Interests
Chemistry of magmatic volatiles, global carbon cycle, volcanic lakes

 

Recent publications

Evans, W. C., Sorey, M. L., Kennedy, B. M., Stonestrom, D. A., Rogie, J. D., and Shuster, D. L., 2001a, High CO2 emissions through porous media: transport mechanisms and implications for flux measurement and fractionation: Chemical Geology, v. 177, p. 15-29.

Cook, A. C., Hainsworth, L. J., Sorey, M. L., Evans, W. C., and Southon, J.R., 2001, Radiocarbon studies of plant leaves and tree rings from Mammoth Mountain, CA: a long-term record of magmatic CO2 release: Chemical Geology, v. 177, p. 117- 131.

Evans, W. C., Sorey, M. L., Michel, R. L., Cook, A. C., Kennedy, B. M., and Busenberg, E., 2001b, Tracing magmatic carbon in groundwater at Big Springs, Long Valley caldera, USA, in Cidu, R., ed.: Water-Rock Interaction-10, Cagliari, 2001, p. 803- 806.

Sorey, M. L., Evans, W. C., McGimsey, R. G., and Werner, C., 2001, Magmatic carbon and helium discharge from Shrub mud volcano, Copper River basin, southeastern Alaska, USA, in Cidu, R., ed.: Water-Rock Interaction-10, Cagliari, 2001, p. 919- 922.

Evans, W. C., Mariner, R. H., Ingebritsen, S. E., Kennedy, B. M., van Soest, M. C., and Huebner, M. A., 2002a, Report of hydrologic investigations in the Three Sisters area of central Oregon, summer 2001: U.S. Geological Survey Water-Resources Investigations Report 02-4061, 13 p.

Evans, W. C., Sorey, M. L., Cook, A. C., Kennedy, B. M., Shuster, D. L., Colvard, E. L., White, L. D., and Huebner, M. A., 2002b, Tracing and quantifying magmatic carbon discharge in cold groundwaters: Lessons learned from Mammoth Mountain, USA: Journal of Volcanology and Geothermal Research, v. 114, p. 291-312.

Symonds, R. B., Janik, C. J., Evans, W. C., Ritchie, B. E., Counce, D., Poreda, R. J., and Iven, M., 2003, Scrubbing masks magmatic degassing during repose at Cascade Range and Aleutian arc volcanoes: U.S. Geological Survey Open-File Report 03- 435, 22 p.

Symonds, R. B., Poreda, R. J., Evans, W. C., Janik, C. J., and Ritchie, B. E., 2003, Mantle and crustal sources of carbon, nitrogen, and noble gases in Cascade Range and Aleutian arc volcanic gases: U.S. Geological Survey Open-File Report 03- 436, 25 p.

Mariner, R. H., Evans, W. C., Presser, T. S., and White L. D., 2003, Excess nitrogen in selected thermal and mineral springs of the Cascade Range in northern California, Oregon, and Washington: sedimentary or volcanic in origin? Journal of Volcanology and Geothermal Research, v. 121, p. 99-114.

Lewicki, J. L., Evans, W. C., Hilley, G. E., Sorey, M. L., Rogie, J. D., and Brantley, S. L., 2003, Shallow soil CO2 flow along the San Andreas and Calaveras Faults, California: Journal of Geophysical Research, v. 108, no. B4.

Hurwitz, S., Goff, F., Janik, C. J., Evans, W. C., Counce, D. A., Sorey, M. L., and Ingebritsen, S. E., 2003, Mixing of magmatic volatiles with groundwater and interaction with basalt on the summit of Kilauea volcano, Hawaii: Journal of Geophysical Research, v. 108, B1-2028.

Evans, W. C., Lorenson, T. D., Sorey, M. L., and Bergfeld, D., 2004a, Transport of injected isobutane by thermal groundwater in Long Valley caldera, California, USA, in Wanty, R. B. and Seal II, R. R. eds: Water-Rock Interaction-11, Saratoga Springs, 2004, p. 125-129.

van Soest, M. C., Evans, W. C., Mariner, R. H., and Schmidt, M. E., 2004, Chloride in hot springs of the Cascade volcanic arc – the source puzzle, in Wanty, R. B. and Seal II, R. R. eds: Water-Rock Interaction-11, Saratoga Springs, 2004, p. 209- 213.

Evans, W. C., van Soest, M. C., Mariner, R. H., Hurwitz, S., Ingebritsen, S. E., Wicks, C. W. Jr., and Schmidt, M. E., 2004b, Magmatic intrusion west of Three Sisters, central Oregon, USA: The perspective from spring geochemistry: Geology, v. 32, p. 69-72.

Kling, G. W., Evans, W.C., Tanyileke, G., Kusakabe, M., Ohba, T., Yoshida, Y., and Hell, J. V., 2005, Degassing Lakes Nyos and Monoun – defusing certain disaster: Proceedings of the National Academy of Sciences, v. 102, p. 14185-14190.

Mariner, R. H., Evans, W. C., and Young, H. W., 2006, Comparison of circulation times of thermal waters discharging from the Idaho batholith based on geothermometer temperatures, helium concentrations, and 14C measurements: Geothermics, v. 35, p. 3-25.

Eby, G. N. and Evans, W. C., 2006, Taming the killer lakes of Cameroon: Geology Today, v. 22, p. 18-22.

Evans, W. C., Bergfeld, D., van Soest, M. C., Huebner, M. A., Fitzpatrick J, and Revesz, K. M., 2006, Geochemistry of low-temperature springs northwest of Yellowstone caldera: seeking the link between seismicity, deformation, and fluid flow: Journal of Volcanology and Geothermal Research, v. 154, p. 169-180.

Bergfeld, D., Evans, W. C., Howle, J. F., and Farrar, C. D., 2006, Carbon dioxide emissions from vegetation-kill zones around the resurgent dome of Long Valley caldera, eastern California, USA: Journal of Volcanology and Geothermal Research, v. 152, p. 140-15.