Publications

  • Volcán de Colima: managing the threat, 2017. Editors: Nick Varley, Charles Connor & Jean-Christophe Komorowski. Springer.

  • Farquharson, J., Heap, M.J., Varley, N.R., Baud, P. and Reuschlé, T., 2015. Permeability and porosity relationships of edifice-forming andesites: A combined field and laboratory study. Journal of Volcanology and Geothermal Research, 297(0): 52-68.
  • Olivier Reubi, Kenneth WW Sims, Nicholas Varley, Mark Reagan, Jost Eikenberg, 2015.Timescales of degassing and conduit dynamics inferred from 210Pb-226Ra disequilibria in Volcán de Colima 1998-2010 andesitic magmas. In: Carrichi L, Blundy J.G. (eds) Chemical, physical and temporal evolution of magmatic systems. Geological Society, London. Special publications 422. http://doi.org/10.1144/SP422.5.
  • Cassidy, M., Cole, P.D., Hicks, K.E., Varley, N.R., Peters, N. and Lerner, A.H., 2015. Rapid and slow: Varying magma ascent rates as a mechanism for Vulcanian explosions. Earth and Planetary Science Letters, 420(0): 73-84.
  • Lamb, O.D., Varley, N.R., Mather, T.A., Pyle, D.M., Smith, P.J. and Liu, E.J., 2014. Multiple timescales of cyclical behaviour observed at two dome-forming eruptions. Journal of Volcanology and Geothermal Research, 284(0): 106-121.
  • Varley, N. 2014. Rockfall Seismicity Accompanying Dome Building Eruptions. In: Beer, M, Kougioumtzoglou, I.A. Patelli, E. & Siu-Kui Au, I. (Editors); Encyclopedia of Earthquake Engineering. Springer-Verlag Berlin Heidelberg; DOI 10.1007/978-3-642-36197-5.
  • Erica B. Webb, Nick R. Varley, David M. Pyle, Tamsin A. Mather. 2014. Characterisation of short-lived Vulcanian explosions at Volcán de Colima, Mexico by analysis of thermal imagery. Journal of Volcanology and Geothermal Research 278–279: 132–145.
  • Michael Heap; Yan Lavallée; Linda Petrakova; Patrick Baud; T. Reuschlé; Nick Varley; Donald Dingwell. 2014. Microstructural controls on the physical and mechanical properties of edifice-forming andesites at Volcán de Colima, Mexico. Journal of Geophysical Research 119 (4): 2925–2963. DOI: 10.1002/2013JB010521
  • Arámbula-Mendoza, R., Valdés-González, C., Varley, N., Juárez-García, B., Alonso-Rivera, P. and Hernández-Joffre, V., 2013. Observation of Vulcanian explosions with seismic and acoustic data at Popocatépetl volcano, Mexico. In: Z. Vyacheslav (Editor), Monitoring of Volcanic Activity: Methods and Results. Nova Science Publishers, Inc., New York, pp. 13-33.
  • Understanding Open-Vent Volcanism and Related Hazards, 2013. Edited by William I. Rose, Jose Luis Palma, Hugo Delgado Granados and Nick Varley. GSA Special Paper 498; DOI: 10.1130/ ISBN 9780813724980. 230pp.
  • Jose Luis Palma, Bill Rose, Nick Varley, and Hugo Delgado, 2013. Open-vent volcanism and related hazards: Overview, In: Understanding Open-Vent Volcanism and Related Hazards, GSA Special Paper 498; p. vii-xiii, doi:10.1130/2013.2498(00).
  • Hutchison, W., Varley, N., Pyle, D.M., Mather, T.A. 2013. Airborne Thermal Remote Sensing of the Volcán de Colima (Mexico) Lava Dome from 2007 to 2010. Geological Society Special Publication 380, Remote-sensing of volcanoes and volcanic processes: integrating observation and modelling (Edited by D.M. Pyle, T.A. Mather and J. Biggs); 203-228.
  • Stefan M. Lachowycz, David M. Pyle, Tamsin A. Mather, Nick R. Varley, Henry M. Odbert, Paul D. Cole, Gabriel A. Reyes-Dávila. 2013. Long-range correlations identified in time-series of volcano seismicity during dome-forming eruptions using detrended fluctuation analysis. Journal of Volcanology & Geothermal Research 264: 197-209.
  • S.B. Mueller, N.R. Varley, U. Kueppers, P. Lesage, G.A. Reyes Davila, and D.B. Dingwell. 2013. Quantification of magma ascent rate through rockfall monitoring at the growing/collapsing lava dome of Volcán de Colima, Mexico. Solid Earth, 4: 201-213.
  • Bernstein, M., Pavez, A., Varley, N., Whelley, P. and Calder, E.S. 2013. Rhyolite lava dome growth styles at Chaitén Volcano, Chile (2008-2009): Interpretation of thermal imagery. Andean Geology, 40(2): 295-309.
  • Reubi, O., Blundy, J. and Varley, N.R., 2013. Volatiles contents, degassing and crystallisation of intermediate magmas at Volcan de Colima, Mexico, inferred from melt inclusions. Contributions to Mineralogy and Petrology, 165(6): 1087-1106.
  • Yuri Taran, Dante Morán-Zenteno, Salvatore Inguaggiato, Nicholas Varley, Laura Luna-González. 2013. Geochemistry of thermal springs and geodynamics of the convergent Mexican Paci?c margin. Chemical Geology 339: 251-262. http://dx.doi.org/10.1016/j.chemgeo.2012.08.025.
  • Varley, N. 2012. The Volcanoes of Mexico. In: Meyers, R.A. (Editor) Encyclopedia of Sustainability Science and Technology. Springer. DOI 10.1007/978-1-4419-0851-3.
  • James, M. R. and N. Varley. 2012. Identification of structural controls in an active lava dome with high resolution DEMs: Volcán de Colima, Mexico. Geophys. Res. Lett. 39(22): L22303.
  • Lavallée, Y., N. Varley, M. A. Alatorre-Ibargüengoitia, K.-U. Hess, U. Kueppers, S. Mueller, D. Richard, B. Scheu, O. Spieler, D. B. Dingwell. 2012. Magmatic architecture of dome-building eruptions at Volcán de Colima, Mexico. Bulletin of Volcanology. doi: 10.1007/s00445-011-0518-4.
  • Arámbula-Mendoza, R., P. Lesage, C. Valdés-González, N.R. Varley, G. Reyes-Dávila, C. Navarro, 2011. Seismic activity that accompanied the effusive and explosive eruptions during the 2004-2005 period at Volcán de Colima, Mexico. Journal of Volcanology & Geothermal Research, 205: 30-46; doi:10.1016/j.jvolgeores.2011.02.009.
  • Martin Jutzeler, Nick Varley, Michael Roach, 2011. Geophysical characterization of hydrothermal systems and intrusive bodies, El Chichón volcano (Mexico). Journal of Geophysical Research. 116, B04104; doi:10.1029/2010JB007992.
  • Agnes Mazot, Dmitri Rouwet, Yuri Taran, Salvatore Inguaggiato and Nick Varley, 2011. CO2 and He degassing at El Chichón volcano, Chiapas, Mexico: gas flux, origin, and relationship with local and regional tectonics. Bulletin of Volcanology, 73: 423-441. doi: 10.1007/s00445-010-0443-y.
  • J.B. Johnson, J. Lees, N. Varley, 2011. Characterizing complex eruptive activity at Santiaguito, Guatemala using infrasound semblance in networked arrays. Journal of Volcanology and Geothermal Research, 199(1-2): 1-14; doi: 10.1016/j.jvolgeores.2010.08.005
  • Y.A. Taran, N.R. Varley, S. Inguaggiato, E. Cienfuegos, 2010. Geochemistry of H2- and CH4-enriched hydrothermal fluids of Socorro Island, Revillagigedo Archipelago, Mexico. Evidences for serpentinization and abiogenic methane. Geofluids, 10: 542-555; doi: 10.1111/j.1468-8123.2010.00314.x
  • Varley, N.R., Arámbula-Mendoza, R., Reyes, G., Sanderson, R. and Stevenson, J., 2010. Generation of Vulcanian activity and long-period seismicity at Volcán de Colima, Mexico. Journal of Volcanology and Geothermal Research, 198(1-2): 45-56; doi:10.1016/j.jvolgeores.2010.08.009.
  • Varley, N.R., Arámbula-Mendoza, R., Reyes-Dávila, G., Stevenson, J. and Harwood, R., 2010. Long-period seismicity during magma movement at Volcán de Colima. Bulletin of Volcanology: 72:1093–1107; doi: 10.1007/s00445-010-0390-7.
  • Sulpizio, R. Capra, D. Sarocchi, R. Saucedo, J.C. Gavilanes-Ruiz, and N.R. Varley, 2010. Predicting the block-and-ash flow inundation areas at Volcán de Colima (Colima, Mexico) based on the present day (February 2010) status. Journal of Volcanology and Geothermal Research, 193(1-2): 49-66.
  • L. Capra, L. Borselli, N. Varley, J.C. Gavilanes-Ruiz, G. Norini, D. Sarocchi, L. Caballero and A. Cortes, 2010. Rainfall-triggered lahars at Volcán de Colima, Mexico: Surface hydro-repellency as initiation process. Journal of Volcanology and Geothermal Research 189 (1-2); 105-117; doi:10.1016/j.jvolgeores.2009.10.014.
  • Evans, J.R., Huntoon, J.E., Rose, W.I., Varley, N.R. and Stevenson, J.A., 2009. Particle sizes of andesitic ash fallout from vertical eruptions and co-pyroclastic flow clouds, Volcán de Colima, Mexico. Geology, 37(10): 935-938.
  • Juan Carlos Gavilanes-Ruiz, Alicia Cuevas-Muñiz, Nick Varley, Gemma Gwynne, John Stevenson, Ricardo Saucedo-Girón, Anaid Pérez-Pérez, Mary Aboukhalil, Abel Cortés-Cortés. 2009. Exploring the factors that influence the perception of risk: The case of Volcán de Colima, Mexico. Journal of Volcanology and Geothermal Research 186; 238-252. doi:10.1016/j.jvolgeores.2008.12.021.
  • Zobin, V.M., N. Varley, M. Bretón, C. Navarro, J.J. Ramírez, G.A. Reyes, and H. Santiago, Multi-disciplinary study of the 2004 extrusion of andesitic lava at Volcán de Colima, México, in VOLUME Project - Volcanoes: Understanding subsurface mass movement, edited by C.J. Bean, A.K. Braiden, I. Lokmer, F. Martini, and G.S. O'Brian, pp. 319-329, University College Dublin, Dublin, 2009.
  • Dmitri Rouwet, Salvatore Inguaggiato, Yuri Taran, Nicholas Varley and José A. Santiago S. 2009. Chemical and isotopic compositions of thermal springs, fumaroles and bubbling gases at Tacaná Volcano (Mexico–Guatemala): implications for volcanic surveillance. Bulletin of Volcanology, 71(3); 319-335. doi: 10.1007/s00445-008-0226-x.
  • J. Stevenson & N. Varley. 2008. Monitoring of fumaroles with a hand-held infrared camera at Volcán de Colima, Mexico, 2006-2007. Journal of Volcanology and Geothermal Research 177; 911-924.
  • Johnson, J.B., J. Lees, A. Gerst, D. Sahagian, y N.R. Varley. 2008. Long-period earthquakes and co-eruptive dome inflation seen with particle image velocimetry, Nature, 456; 377-381.
  • Vyacheslav M. Zobin, Nicholas R. Varley, Miguel González, Justo Orozco, Gabriel A. Reyes, Carlos Navarro, Mauricio Bretón. 2008. Monitoring the 2004 andesite block-lava extrusion at Volcán de Colima, México from seismic activity and SO2 emission. Journal of Volcanology and Geothermal Research 177; 367-377.
  • D. Rouwet, Y. Taran, S. Inguaggiato, N. Varley, J.A. Santiago Santiago. 2008. Hydrochemical dynamics of the “lake–spring” system in the crater of El Chichón volcano (Chiapas, Mexico). Journal of Volcanology and Geothermal Research 178; 237-248.
  • N. Davila, L. Capra, J.C. Gavilanes-Ruiz, N. Varley, G. Norini, A. Gómez Vázquez 2007. Recent lahars at Volcán de Colima (Mexico): Drainage variation and spectral classification. Journal of Volcanology and Geothermal Research, 165; 127-141.
  • J.L. Macías, R. Saucedo, Juan Carlos Gavilanes, Nick Varley, Sergio Velasco, Marcus Bursik, Víctor Vargas y Abel Cortés, 2006. Flujos piroclásticos asociados a la actividad explosiva del Volcán de Colima y perspectivas futuras. GEOS 25(3), 340-350.
  • Nick Varley , Jeffrey Johnson, Mario Ruiz, Gabriel Reyes and Kristin Martin (2006): Applying statistical analysis to understanding the dynamics of volcanic explosions. Statistics in Volcanology, Special publication of IAVCEI, Vol. 1: 57-76.
  • Lewicki, J.L., D. Bergfeld, C. Cardellini, G. Chiodini, D. Granieri, N. Varley, and C. Werner (2005): Comparative soil CO2 flux measurements and geostatistical estimation methods on Masaya volcano, Nicaragua, Bulletin of Volcanology, publicado en linea.
  • Inguaggiato S., Y. Taran, F. Grassa, G. Capasso, R. Favara, N. Varley, E. Faber (2004): Nitrogen isotopes in thermal fluids of a fore-arc region (Jalisco Block, Mexico): Evidence for heavy nitrogen from continental crust. Geochemistry, Geophysics, Geosystems 5 (12); Q12003, doi:10.1029/2004GC000767
  • Varley N. & Taran Y. (2004): Procesos de desgasificación del Volcán de Colima y Popocatépetl, México. Iridia Revista de la Universidad de Colima. Vol. 1: 52-71
  • Rouwet D., Taran Y.A., Inguaggiato S., Varley N.R. (2004): Hydrothermal activity at Tacaná volcano, México-Guatemala. Water Rock Interaction-11.
  • Dmitri Rouwet, Yuri A. Taran and Nicholas R. Varley (2004): Dynamics and mass balance of El Chichón crater lake, Mexico. Geofí­sica Internacional 43 (3): 427-434.
  • Varley, N. R. (2003): Soil gas concentrations at Popocatépetl, Mexico. Vulcí¢nica - Revista Portuguesa de Vulcanologia, Vol I: 155-162.
  • Varley N. & Taran Y. (2003): Degassing Processes of Popocatépetl and Volcán de Colima, México. Oppenheimer, C., Pyle, D.M. & Barclay, J. (eds) Volcanic degassing. Geological Society, London, Special Publications 213, 263-280.
  • Taran Y., Inguaggiato S., Varley N., Capasso G. and Favara R. (2002): Helium and carbon isotopes in thermal waters of the Jalisco Block, Mexico. Geofí­sica Internacional 41 (4): 459-466.
  • Armienta M.A., Varley, N.R. and Ramos E. (2002): Radon and hydrogeochemical monitoring at Popocatépetl volcano, Mexico. Geofí­sica Internacional 41 (3): 271-276.
  • Varley NR & Armienta MA (2001): The absence of diffuse degassing at Popocatépetl volcano, Mexico. Chemical Geology 177 (1-2): 157-173.
  • Varley NR & Armienta MA (1999): Soil gas measurements as an indicator of volcanic activity. Il Nuovo Cimento. 22C (3-4) 269-274.
  • Varley NR & Flowers AF (1998): The influence of geology on radon levels in SW England. Radiation Protection Dosimetry 77 (3) 171-176.
  • Varley NR & Flowers AF (1998): Indoor radon prediction from soil gas measurements. Health Physics 74 (6) 714-718.
  • Varley NR & Flowers AF (1994): Relationship between indoor and soil gas radon in SW England. Proc. of IRPA Congress, Portsmouth 297-300.
  • Varley NR & Flowers AF (1993): Radon in soil gas and its relationship with some major faults of SW England. Environmental Geochemistry & Health 15 145-151.
  • Varley NR & Flowers AF (1992): Radon and its correlation with some geological features of the south-west of England. Radiation Protection Dosimetry 45 245-248.