U.S. Geological Survey MS #439
345 Middlefield Rd.
Menlo Park, CA 94025
Tel: (650) 329-4441

Ph.D., The Hebrew University of Jerusalem

My research interests focus on the coupling between groundwater flow, heat and mass transport, and various geological processes, mainly in volcano-hydrothermal systems. In these systems, aqueous and gas-rich fluids are a source of hazard (e.g., propellant in steam-driven explosions, lubricant in mudflows, toxic gases and dissolved constituents), a resource (e.g., geothermal energy and mineral deposits), and a potential indicator for one of the earliest warnings of unrest. Many of the geochemical, geodetic, and seismic signals measured at the ground surface as part of the volcano monitoring techniques have hydrothermal origins or magmatic origins modulated by the intervening hydrothermal system. My major research objectives are to characterize spatial and temporal patterns of temperature, pressure, chemistry, and phase (e.g. liquid or gas) in volcano-hydrothermal systems and relate them to magmatic and/or volcanic activity. I also apply multi-phase numerical models to develop quantitative and conceptual models of hydrothermal systems. This research is intended to support the USGS Volcano Hazards Program’s broad goal of lessening the harmful impacts of volcanic activity and the USGS Geothermal Program to explore and develop technologies that will allow us to tap into reservoirs of geothermal heat that are known to exist in the Earth’s crust.

* Numerical simulations of volcano-hydrothermal systems
* Characterizing the composition and flux of magmatic volatiles as indicators of magmatic activity
* Quantifying heat transport in volcanic systems
* Geyser dynamics with implications for volcanic processes
* Climate forcing of volcanic and earthquake Hazards
* Development of technology to improve volcano monitoring
* HD-YLAKE - Hydrothermal Dynamics of Yellowstone Lake
* Annual Hubbert Quorum on crustal fluids



Hurwitz, S., Manga, M., 2017, The fascinating and complex dynamics of geyser eruptions, Annual Review of Earth and Planetary Sciences, 45, in press. abstract

Battistel, M., Hurwitz, S., Evans, W.C., Barbieri, M., 2016, The chemistry and isotopic composition of waters in the low-enthalpy geothermal system of Cimino-Vico Volcanic District, Italy, Journal of Volcanology and Geothermal Research,  in press. abstract

King, J.M., Hurwitz, S., Lowenstern, J.B., Nordstrom, D.K., McCleskey, R.B., 2016, Multireaction equilibrium geothermometry: A sensitivity analysis using data from the Lower Geyser Basin, Yellowstone National Park, USA, Journal of Volcanology and Geothermal Research,  in press. abstract

Namiki, A., Ueno, Y., Hurwitz, S., Manga, M., Munoz-Saez, C., Murphy, F., 2016, An experimental study of the role of subsurface plumbing on geothermal discharge, Geochemistry, Geophysics, Geosystems, 17. abstract.

Hurwitz, S., Clor, L.E., McCleskey, R.B., Nordstrom, D.K., Hunt, A.G., Evans, W.C., 2016, Dissolved gases in hydrothermal (phreatic) and geyser eruptions at Yellowstone National Park, USA, Geology, , 44, 235–238. abstract | pdf

Lowenstern, J.B., Hurwitz, S., McGeehin, J.P.,  2016, Radiocarbon dating of silica sinter deposits in shallow drill cores from the Upper Geyser Basin, Yellowstone National Park, Journal of Volcanology and Geothermal Research, 310, 132-136, doi:10.1016/j.jvolgeores.2015.12.005 abstract | pdf.

Cullen, J.T., Barnes, J.D., Hurwitz, S., Leeman, W.P., 2015, Tracing chlorine sources of thermal and mineral springs along and across the Cascade Range using halogen and chlorine isotope compositions, Earth and Plentary Science Letters, 426, 225-234, doi:10.1016/j.epsl.2015.06.052. abstract | pdf

Munoz-Saez, C., Manga, M., Hurwitz, S.,, Rudolph, M.L., Namiki, A., Wang, C.-Y., 2015, Dynamics within geyser conduits, and sensitivity to environmental perturbations: Insights from a periodic geyser in the El Tatio Geyser Field, Atacama Desert, Chile, Journal of Volcanology and Geothermal Research, 292, 41–55, doi:10.1016/j.jvolgeores.2015.01.002. abstract | pdf

Vandemeulebrouck, J., Sohn, R.A., Rudolph, M.L., Hurwitz, S., Manga, M., Johnston, M.J.S., Soule, S.A., McPhee, D., Glen, J.M.G., Karlstrom, L., Murphy, F., 2014, Eruptions at Lone Star Geyser, Yellowstone National Park, USA, Part 2: Constraints on Subsurface Dynamics, Journal of Geophysical Research, 119, doi:10.1002/2014JB011526. abstract | pdf

Battistel, M., Hurwitz, S., Evans, W.C., Barbieri, M., 2014, Multicomponent geothermometry applied to a medium-low enthalpy carbonate-evaporite geothermal reservoir, Energy Procedia, 59, 359- 365, doi: 10.1016/j.egypro.2014.10.389. abstract | pdf

Hurwitz, S., Lowenstern, J.B., 2014, Dynamics of the Yellowstone Hydrothermal System, Reviews of Geophysics, 51, doi:10.1002/2014RG000452.abstract | pdf | summary in Yellowstone Science

Hurwitz, S., Sohn, R.A., Luttrell, K., Manga, M., 2014, Triggering and Modulation of Geyser Eruptions in Yellowstone National Park by Earthquakes, Earth Tides, and Weather, Journal of Geophysical Research, 119, 1718-1737doi: 10.1002/2013JB010803. abstract | pdf | resarch spotlight

Brown, S.T., Kennedy, B.M., DePaolo, D.J., Hurwitz, S., Evans, W.C., 2013, Ca, Sr, O and D isotope approach to defining the chemical evolution of hydrothermal fluids: Example from Long Valley, CA, USA, Geochimica Cosmochimica Acta, abstract | pdf

Karlstrom, L., Hurwitz, S., Sohn, R.A., Vandemeulebrouck, J., Murphy, F., Rudolph, M.L., Johnston, M.J.S., Manga, M., McCleskey, R.B. 2013, Eruptions at Lone Star Geyser, Yellowstone National Park, USA, Part 1: Energetics and Eruption Dynamics, Journal of Geophysical Research, 118, 1-15, DOI: 10.1002/jgrb.50251, .abstract | pdf | resarch spotlight | Physics Today

Luttrell, K., Mencin, D., Francis, O., Hurwitz, S. 2013, Constraints on the Upper Crustal Magma Reservoir Beneath Yellowstone Caldera Inferred From Lake-Seiche Induced strain observations, Geophysicsical Research Letters, 40, 501-506. abstract | pdf

Evans, W.C., Hurwitz, S., Bergfeld, D., Lewicki, J., Huebner, M.A., Williams, C.F., Brown, S.T. 2013, Fluid chemistry and water-rock interaction in the Long Valley hydrothermal system (USA), Procedia Earth and Planetary Science, 7, 252–255. abstract | pdf.

Rudolph, M.L., Manga, M., Hurwitz, S., Johnston, M., Karlstrom, L., Wang, C-Y., 2012, Mechanics of Old Faithful Geyser, Calistoga CA,Geophysics Research Letters, 39, L24308, doi:10.1029/2012GL054012..abstract | pdf

Hurwitz, S., Hunt, A.G., Evans, W.C., 2012, Temporal Variations of geyserwWater chemistry in the Upper Geyser Basin, Yellowstone National Park, USA,Geochemistry Geophysics Geosystems, 13, Q12005, doi:10.1029/2012GC004388. abstract | pdf

Hurwitz, S., Harris, R.N., Werner, C.A., Murphy, F., 2012, Heat flow in Vapor dominated areas of the Yellowstone Plateau Volcanic Field: Implications for the Thermal Budget of the Yellowstone Caldera, Journal of Geophysical Research, 117, B10, doi:10.1029/2012JB009463 abstract | pdf.

Bergfeld, D.,  Evans, W.C., Lowenstern, J.B., Hurwitz, S.,  2012, Carbon dioxide and hydrogen sulfide degassing and cryptic thermal input to Brimstone Basin, Yellowstone National Park, Wyoming, Chem. Geolo, 330–331, 233–243, abstract | pdf

Lowenstern, J.B., Bergfeld, D., Evans, W.C., Hurwitz, S., 2012, Generation and evolution of hydrothermal fluids at Yellowstone: insights from the Heart Lake Geyser Basin, Geochem. Geophys. Geosyst., 13, Q01017, doi:10.1029/2011GC003835. abstract | pdf

Hurwitz, S., Farrar, C.D., Williams, C.F., 2010, The Thermal regime in the Resurgent Dome of Long Valley Caldera, California, Inferences from precision temperature logs in deep wells, Journal of Volcanology and Geothermal Research, 198, 233-240.abstract | pdf.

Farrar, C.D., DeAngelo, J., Williams, C.F., Hurwitz, S., 2010, Temperature Data from Wells in Long Valley Caldera, California, U.S. Geological Survey Data Series 523,

Hurwitz, S., Evans, W.C., Lowenstern, J.B., 2010, River solute fluxes reflecting active hydrothermal chemical weathering of the Yellowstone Plateau Volcanic Field, USA: Chemical Geology, 276, 331–343. doi:10.1016/j.chemgeo.2010.07.001. abstract | pdf

Ingebritsen, S. E., Geiger, S., Hurwitz, S., Driesner, T., 2010, Numerical simulation of magmatic hydrothermal systems, Reviews of Geophysics, 48, RG1002, doi:10.1029/2009RG000287. abstract | pdf

Hutnak, M., Hurwitz, S., Ingebritsen, S., Hsieh., 2009, Numerical models of caldera deformation: Effects of multi-phase and multi-component hydrothermal fluid flow, Journal of Geophysical Research, 114, B04411, doi:10.1029/2008JB006151. abstract | pdf

Werner, C.,. Hurwitz, S., Bergfeld, B., Evans, W.C., Lowenstern, J.B., Heasler, H., Jaworowski, C., Hunt, A., 2008, Volatile emissions and gas geochemistry of Hot Spring Basin, Yellowstone National Park, USA, Journal of Volcanology and Geothermal Research, 178 , 751-762, DOI: 10.1016/j.jvolgeores.2008.09.016. abstract | pdf

Hurwitz, S., Kumar, A., Taylor, R., Heasler, H., 2008, Climate-induced variations of geyser periodicity in Yellowstone National Park, USA, Geology, 36, 451-454. abstract | pdf | press coverage

Lowenstern, J.B., Hurwitz, S., 2008, Monitoring a supervolcano in repose: Heat and volatile flux at the Yellowstone Caldera, Elements, 4 , 35-40. abstract | pdf

Ingebritsen, S.E., Hurwitz, S., and Brodsky, E.E., 2008, Note from the Hubbert Quorum, Geofluids, 8, 1-2. pdf

Farrar, C.D., Evans, W.C., Venezky, D.Y., Hurwitz, S., Oliver, L.K., 2007, Boiling water at Hot Creek – the dangerous and dynamic thermal springs in California's Long Valley Caldera: U.S. Geological Survey Fact Sheet 2007-3045,

Hurwitz , S., Eagan, S., Heasler, H., Lowenstern, J.B., 2007, River chemistry and solute flux in Yellowstone National Park, U.S. Geological Survey Digital Data Series 278,

Hurwitz, S., Evans, W.C., Lowenstern, J.B., Bergfeld, D., Werner, C., Heasler, H., Jaworowski, C., 2007, Extensive hydrothermal rock alteration in a low pH, steam-heated environment: Hot Springs Basin, Yellowstone National Park, in Bullen, T.D., and Wang, Y. eds: Proceedings of the Water-Rock Interaction Symposium -12, Kunming, China, p. 81-85. pdf

Hurwitz, S., Lowenstern, J.B., Heasler, H., 2007 Spatial and temporal geochemical trends in the hydrothermal system of Yellowstone National Park: inferences from river solute fluxes, Journal of Volcanology and Geothermal Rsearch , 162, 149-171. abstract | pdf

Christiansen, L.B., Hurwitz, S., Ingebritsen, S., 2007, Annual modulation of seismicity along the San Andreas Fault near Parkfield, CA, Geophysical research Letters, 34, L04306, doi:10.1029/2006GL028634. abstract | pdf

Hurwitz, S., Christiansen, L.B., Hsieh, P., 2007, Hydrothermal fluid flow and Deformation in large calderas: inferences from numerical simulations, Journal of Geophysical Research, 112, B02206, doi:10.1029/2006JB004689. abstract | pdf

Abedini, A.A., Hurwitz, S., and Evans, W.C., 2006, USGS-NoGaDat – A global dataset of noble gas concentrations and their isotopic ratios in volcanic systems, U.S. Geological SurveyDigitalData Series , 202,

Mariner, R.H., Venezky, D.Y., and Hurwitz, S.,2006, Chemical and isotopic database of water and gas from hydrothermal systems with an emphasis for the western United States, U.S. Geological Survey DigitalData Series, 169

Christiansen, L.B., Hurwitz, S., Saar , M.O., Ingebritsen, S.E., and Hsieh, P.A., 2005, Seasonal seismicity at western United States volcanic centers: Earth and Planetary Science Letters, 240, 307– 321. abstract | pdf

Hurwitz, S., Mariner, R.H., Fehn, U., Snyder, G.T., 2005, Systematics of halogen elements and their radioisotopes in thermal springs of the Cascade Range, Central Oregon, Western USA, Earth and Planetary Science Letters , 35 , 700-714, doi: 10.1016/j.epsl.2005.04.029 . abstract | pdf

Goldman, M., Gvirtzman, H. and S. Hurwitz, 2004, Mapping saline groundwater beneath the Sea of Galilee and its vicinity using time domain electromagnetic (TDEM) geophysical technique, Israel Journal of Earth Sciences, 53, 187-197. abstract | pdf

Evans, W.C., M. van Soest, R.H. Mariner, S. Hurwitz, S.E. Ingebritsen, C.W. Wicks, M.E. Schmidt, 2004, Magmatic intrusion west of Three Sisters, central Oregon, USA: The perspective from spring geochemistry, Geology, 32, 69–72; doi: 10.1130/G19974.1. abstract | pdf

Hurwitz , S., K.L. Kipp, M.E. Reid, and S.E. Ingebritsen, 2003, Groundwater flow, heat transport, and water-table position within volcanic edifices: Implications for volcanic processes in the Cascade Range, Journal of Geophysical Research, 108,  2557, doi: 10.1029/2003JB002565. abstract | pdf

Hurwitz, S., and M.J. Johnston, 2003, Groundwater level changes in a deep well in response to an intrusion event on Kilauea Volcano, Hawai’i, Geophysical Research Letters, 30, 22,2173, doi:10.1029/2003GL018676. abstract | pdf

Hurwitz , S., and S.E. Ingebritsen, 2003, Good news or bad?: New study of temperature inversions in NSF deep geothermal well at Kilauea volcano: Geothermal Resources Council Bulletin, 32, 111-115. pdf

Hurwitz , S., F. Goff, C.J. Janik, W.C. Evans, D.A. Counce, M.L. Sorey, S.E. Ingebritsen, 2003, Mixing of magmatic volatiles with groundwater and interaction with basalt, on the summit of Kilauea Volcano , Hawaii, Journal of Geophysical Research, 108, 2028, doi:10.1029/2001JB001594. abstract | pdf

Hurwitz, S., Garfunkel, Z., Ben-Gai, Y., Reznikov, M., Rotstein, Y., and Gvirtzman, H., 2002, The tectonic framework of the Kinarot-Beit Shean basin (Dead Sea transform): Evidence from multi-channel seismic reflection. Tectonophysics, 359 , 289-306. abstract | pdf

Hurwitz, S., S.E. Ingebritsen and M.L. Sorey, 2002, Episodic thermal perturbations associated with groundwater flow: Example from Kilauea Volcano, Hawaii , Journal of Geophysical Research, 107 , 2297, doi:10.1029/2001JB001654. abstract | pdf

Hurwitz, S., Stanislavsky, E., Lyakhovsky, L. and Gvirtzman, H., 2000, Groundwater interactions with an alternating fresh/saline-water lake in a continental rift: Sea of Galilee, Israel. Geological Society of America Bulletin, 112,1694-1702. abstract | pdf

Hurwitz, S., Lyakhovsky, L. and Gvirtzman, H., 2000, Transient salt-transport modeling of a shallow brine beneath a fresh-water lake, the Sea of Galilee. Water Resources Research, 36, 101-108. abstract | pdf

Hurwitz. S., Matmon, A., Ron, H. and Heimann, A., 1999, Deformation along the margins of the Dead Sea Transform: the Yehudia Block, Golan Heights. Israel Journal of Earth Sciences, 48, 257-264. pdf

Hurwitz, S., Goldman, M., Ezersky, M. and Gvirtzman, H., 1999, Geophysical (TDEM) delineation of a shallow brine beneath a fresh-water lake, the Sea of Galilee. Water Resources Research, 35, 3631-3638. abstract | pdf

Rimmer, A., Hurwitz, S. and Gvirtzman, H., 1999, Spatial and temporal characteristics of saline springs: Sea of Galilee, Israel. Ground Water, 37, 663-673. abstract | pdf

Goldman, M., Hurwitz, S., Gvirtzman, H., Rotstein, Y. and Rabinovitch, B., 1996. Application of the marine time domain electromagnetic method in lakes: the Sea of Galilee, Israel. European Journal of Environmental Engineering and Geophysics,1, 125-138.

Lyakhovsky, L., Hurwitz, S. and Navon, O., 1996. Bubble growth in rhyolitic melts: Experimental and numerical investigation. Bulletin of Volcanology, 58, 19-32. abstract | pdf

Hurwitz, S. and Navon, O., 1994. Bubble nucleation in rhyolitic melts: Experiments at high pressure, temperature and water contents. Earth and Planetary Science Letters, 122, 267-280. abstract | pdf