Terrence M. Gerlach


	Cascades Volcano Observatory
	U. S. Geological Survey
	5400 MacArthur Boulevard
	Vancouver, Washington 98661-7095

	Office: (360) 993-8916
	Fax:    (360) 993-8980
	email: tgerlach@usgs.gov


Terrence M. Gerlach received his BS and MS degrees in geology and geophysics from the University of Wisconsin and his Ph.D. in geology from the University of Arizona. He carried out a thermodynamic study of volcanic gases for his Ph.D. research. In his postdoctoral research, he investigated the geothermal resource potential of Arizona and modeled mass transfer in copper porphyry deposits. He joined Sandia National Labs in 1975 as a member of the Technical Staff was involved in basic research on magmatic volatiles and applied research in support of several DOE energy and materials science projects. He became the Supervisor of the Geochemistry Division at Sandia in 1982 and continued to do research on magmatic volatiles. In 1990, he joined the US Geological Survey and returned to full time research on volcanic gases. He is presently the project chief for the Volcano Emissions Project and a member of the USGS Western Region Volcano Hazards Team. His current research emphasizes measurement of volcanic carbon dioxide emissions through soil gas measurements and airborne studies of volcanic plumes.


   Gerlach, T. M., Doukas, M. P., McGee, K. A., and Kessler, R., 1998,
          Three-year decline of magmatic CO2 emissions from soils of a 
          Mammoth Mountain tree kill: Horseshoe Lake, CA, 1995-1997: 
          Geophysical Research Letters, v. 25, p. 1947-1950.

   McGee, K. A., and Gerlach, T. M., 1998, Annual cycle of Magmatic CO2 at
          Mammoth Mountain, California: Implications for soil acidification: 
          Geology, v. 26, p. 463-466. 

   McGee, K. A., and Gerlach, T. M., 1998, Airborne volcanic plume measurements
          using a FTIR spectrometer, Kilauea Volcano, Hawaii: Geophysical 
          Research Letters, v. 25, p. 615-618.

   Gerlach, T. M., Delgado, H., McGee, K. A., Doukas, M. P., Venegas, J. J.,
          and Cardenas, L., 1997, Application of the LI-COR CO2 analyzer 
          to volcanic plumes: A case study, Volcan Popocatepetl, Mexico, 
          June 7 and 10, 1995: Journal of Geophysical Research, v. 102,  
          p. 8005-8019.

   Gerlach, T. M., Westrich, H. R., and Symonds, R. B., 1996, Preeruption 
          vapor in magma of the climactic Mount Pinatubo eruption: Source 
          of the giant stratospheric sulfur dioxide cloud, in Newhall, C. G., 
          and Punongbayan, R. S., eds., Fire and mud: Eruptions and lahars 
          of Mount Pinatubo, Philippines: Philippine Institute of Volcanology 
          and Seismology, Quezon City, and University of Washington Press, 
          Seattle, p. 415-433.

   Doukas, M. P., and Gerlach, T. M., 1995, Sulfur dioxide scrubbing 
          during the 1992 eruption of Crater Peak, Mount Spurr, Alaska, 
          in Keith, T., ed., The 1992 eruptions of Crater Peak Vent, 
          Mount Spurr  volcano, Alaska: U.S. Geological Survey Bulletin 
          B-2139, p. 47-57.

   Gerlach, T.M., and McGee, K.A., 1994, Total sulfur dioxide emissions 
          and pre-eruption vapor-saturated magma at Mount St. Helens, 1980-88: 
          Geophysical Research Letters, v. 21, p. 2833-2836.

   Wallace, P.J., and Gerlach, T.M., 1994, Magmatic vapor source for 
          sulfur dioxide released during volcanic eruptions: Evidence from 
          Mount Pinatubo: Science, v. 265, p. 497-499.

   Gerlach, T.M., Westrich, H.R., Casadevall, T.J., and Finnegin, D.L., 1994, 
          Vapor saturation and accumulation in magmas of the 1989-1990 eruption 
          of Redoubt Volcano, Alaska: Journal of Volcanology and Geothermal 
          Research, v. 62, p. 317-337.

   Gerlach, T.M., 1993, Oxygen buffering of Kilauea volcanic gases and the 
          oxygen fugacity of Kilauea basalt: Geochimica et Cosmochimica Acta, 
          v. 57, p. 795-814.
   Westrich, H.R., and Gerlach, T.M., 1992, Magmatic gas source for the 
          stratospheric SO2 cloud from the June 15, 1991 eruption of 
          Mount Pinatubo: Geology, v. 20, p. 867-870.

   Gerlach, T.M., 1991, Present-day CO2 emissions from volcanoes:  
          Transactions of the American Geophysical Union (EOS), v. 72, 
          p. 249, and 254-255.

   Gerlach, T.M., and Taylor, B.E., 1990, Carbon isotope constraints on 
          degassing of carbon dioxide from Kilauea Volcano:  Geochimica 
          et Cosmochimica Acta, v. 54, p. 2051-2058.

   Gerlach, T.M., 1989, Degassing of carbon dioxide from basaltic magma at 
          spreading centers:  II. Mid-oceanic ridge basalts:  Journal of 
          Volcanology and Geothermal Research, v. 39, p. 221-232.

   Gerlach, T.M., and Casadevall, T.J., 1986, Fumarole emissions at Mount 
          St. Helens Volcano, June 1980 to October 1981:  Degassing of a 
          magma-hydrothermal system:  Journal of Volcanology and Geothermal 
          Research, v. 28, p. 141-160.

   Gerlach, T.M., 1986, Exsolution of H2O, CO2, and S during eruptive 
          episodes at Kilauea Volcano, Hawaii:  Journal of Geophysical 
          Research, v. 91, p. 12177-12185.

   Gerlach, T.M., and Graeber, E.J., 1985, Volatile budget of Kilauea 
          Volcano:  Nature, v. 313, p. 273-277.

   Gerlach, T.M., 1982, Interpretation of volcanic gas data from tholeiitic 
          and alkaline mafic lavas:  Bulletin of Volcanology, v. 45-3, 
          p. 235-244.

   Gerlach, T.M., and Nordlie, B.E., 1975, The C-O-H-S gaseous system, Part I:  
          Composition limits and trends in basaltic gases:  American Journal 
          of Science, v. 275, p. 353-376.

   Gerlach, T.M. and Nordlie, B.E., 1975, The C-O-H-S gaseous system, Part II:  
          Temperature, atomic composition, and molecular equilibria in volcanic 
          gases:  American Journal of Science, v. 275, p. 377-394.

   Gerlach, T.M. and Nordlie, B.E., 1975, The C-O-H-S gaseous system, Part III:  
          Magmatic gases compatible with oxides and sulfides in basaltic magmas:
          American Journal of Science, v. 275, p. 395-410.