Search Results - "Varley, Nick"

Permeability and porosity relationships of edifice-forming andesites: A combined field and laboratory study by Farquharson, Jamie, Heap, Michael J., Varley, Nick R., Baud, Patrick, Reuschlé, Thierry

“…Permeability of the edifice is one of the key parameters governing eruptive style, magnitude, and frequency of active stratovolcanoes. This study presents a…”
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First in-situ observation of a moving natural pyroclastic density current using Doppler radar by Scharff, Lea, Hort, Matthias, Varley, Nick R.

“…Pyroclastic density currents are one of the most devastating volcanic hazards. Understanding their dynamics is a key to develop successful hazard mitigation…”
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Thermal photogrammetric imaging: A new technique for monitoring dome eruptions by Thiele, Samuel T., Varley, Nick, James, Mike R.

“…Structure-from-motion (SfM) algorithms greatly facilitate the generation of 3-D topographic models from photographs and can form a valuable component of hazard…”
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Pore pressure embrittlement in a volcanic edifice by Farquharson, Jamie, Heap, Michael J., Baud, Patrick, Reuschlé, Thierry, Varley, Nick R.

“…The failure mode of porous rock in compression—dilatant or compactant—is largely governed by the overlying lithostatic pressure and the pressure of pore fluids…”
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Rapid and slow: Varying magma ascent rates as a mechanism for Vulcanian explosions by Cassidy, Mike, Cole, Paul.D., Hicks, Kelby E., Varley, Nick R., Peters, Nial, Lerner, Allan H.

“…Vulcanian explosions are one of the most common types of volcanic activity observed at silicic volcanoes. Magma ascent rates are often invoked as being the…”
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Evidence for the development of permeability anisotropy in lava domes and volcanic conduits by Farquharson, Jamie I., Heap, Michael J., Lavallée, Yan, Varley, Nick R., Baud, Patrick

“…The ease at which exsolving volatiles can migrate though magma and outgas influences the explosivity of a volcanic eruption. Volcanic rocks often contain…”
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Seismic and experimental insights into eruption precursors at Volcán de Colima by Lamb, Oliver D, De Angelis, Silvio, Wall, Richard J, Lamur, Anthony, Varley, Nick R, Reyes-Dávila, Gabriel, Arámbula-Mendoza, Raúl, Hornby, Adrian J, Kendrick, Jackie E, Lavallée, Yan

“…We combine geophysical and experimental observations to interpret preeruptive unrest at Volcán de Colima in 1998. 17,893 volcanic earthquakes were detected…”
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Thermal Remote Sensing for Global Volcano Monitoring: Experiences From the MIROVA System by Coppola, Diego, Laiolo, Marco, Cigolini, Corrado, Massimetti, Francesco, Delle Donne, Dario, Ripepe, Maurizio, Arias, Hidran, Barsotti, Sara, Parra, Claudia Bucarey, Centeno, Riky Gustavo, Cevuard, Sandrine, Chigna, Gustavo, Chun, Carla, Garaebiti, Esline, Gonzales, Dulce, Griswold, Julie, Juarez, Javier, Lara, Luis E., López, Cristian Mauricio, Macedo, Orlando, Mahinda, Celestin, Ogburn, Sarah, Prambada, Oktory, Ramon, Patricio, Ramos, Domingo, Peltier, Aline, Saunders, Steve, de Zeeuw-van Dalfsen, Elske, Varley, Nick, William, Ricardo

“…MIROVA (Middle Infrared Observation of Volcanic Activity) is an automatic volcano hot spot detection system, based on the analysis of MODIS data (Moderate…”
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Mush remobilisation and mafic recharge: A study of the crystal cargo of the 2013–17 eruption at Volcán de Colima, Mexico by Hughes, Gerallt E., Petrone, Chiara Maria, Downes, Hilary, Varley, Nick R., Hammond, Samantha J.

“…Volcán de Colima is a highly active stratovolcano at the western end of the Trans-Mexican Volcanic Belt. Present-day activity consists of lava dome growth and…”
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Long-period seismicity during magma movement at Volcán de Colima by Varley, Nick R., Arámbula-Mendoza, Raúl, Reyes-Dávila, Gabriel, Stevenson, John, Harwood, Rob

“…During the period from February to September 2005, Volcán de Colima produced 30 Vulcanian explosions of sufficient magnitude to produce pyroclastic flows of…”
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Thermal imaging and analysis of short-lived Vulcanian explosions at Volcán de Colima, Mexico by Webb, Erica B., Varley, Nick R., Pyle, David M., Mather, Tamsin A.

“…Vulcanian explosions present a major hazard at many active volcanoes, but they also provide useful insights into the underlying behaviour of the volcanic…”
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Load Stress Controls on Directional Lava Dome Growth at Volcán de Colima, Mexico by Zorn, Edgar U., Le Corvec, Nicolas, Varley, Nick R., Salzer, Jacqueline T., Walter, Thomas R., Navarro-Ochoa, Carlos, Vargas-Bracamontes, Dulce M., Thiele, Samuel T., Arámbula Mendoza, Raúl

“…During eruptive activity of andesitic stratovolcanoes, the extrusion of lava domes, their collapse and intermittent explosions are common volcanic hazards…”
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Aeolian Remobilisation of Volcanic Ash: Outcomes of a Workshop in the Argentinian Patagonia by Jarvis, Paul A., Bonadonna, Costanza, Dominguez, Lucia, Forte, Pablo, Frischknecht, Corine, Bran, Donaldo, Aguilar, Rigoberto, Beckett, Frances, Elissondo, Manuela, Gillies, John, Kueppers, Ulrich, Merrison, Jonathan, Varley, Nick, Wallace, Kristi L.

“…During explosive volcanic eruptions, large quantities of tephra can be dispersed and deposited over wide areas. Following deposition, subsequent aeolian…”
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Multiple timescales of cyclical behaviour observed at two dome-forming eruptions by Lamb, Oliver D., Varley, Nick R., Mather, Tamsin A., Pyle, David M., Smith, Patrick J., Liu, Emma J.

“…Cyclic behaviour over a range of timescales is a well-documented feature of many dome-forming volcanoes, but has not previously been identified in high…”
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Long-range correlations identified in time-series of volcano seismicity during dome-forming eruptions using detrended fluctuation analysis by Lachowycz, Stefan M., Pyle, David M., Mather, Tamsin A., Varley, Nick R., Odbert, Henry M., Cole, Paul D., Reyes-Dávila, Gabriel A.

“…Understanding the underlying structure of data from volcano monitoring is essential to identify precursors to changes in eruptive activity and to comprehend…”
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Generation of Vulcanian activity and long-period seismicity at Volcan de Colima, Mexico by VARLEY, Nick, ARAMBULA-MENDOZA, Raúl, REYES-DAVILA, Gabriel, SANDERSON, Richard, STEVENSON, John

“…During the current episode, which commenced in 1998, activity at Volcan de Colima has been characterised by daily Vulcanian events, several effusive phases and…”
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Stratigraphy, sedimentology and inferred flow dynamics from the July 2015 block-and-ash flow deposits at Volcán de Colima, Mexico by Macorps, Elodie, Charbonnier, Sylvain J., Varley, Nick R., Capra, Lucia, Atlas, Zachary, Cabré, Josep

“…The July 2015 block-and-ash flow (BAF) events represent the first documented series of large-volume and long-runout BAFs generated from sustained dome…”
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Blowing Off Steam: Tuffisite Formation As a Regulator for Lava Dome Eruptions by Kendrick, Jackie E., Lavallée, Yan, Varley, Nick R., Wadsworth, Fabian B., Lamb, Oliver D., Vasseur, Jérémie

“…Tuffisites are veins of variably sintered, pyroclastic particles that form in conduits and lava domes as a result of localized fragmentation events during…”
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Rhyolite lava dome growth styles at Chaitén Volcano, Chile (2008-2009): Interpretation of thermal imagery by Bernstein, Marc, Pavez, Andrés, Varley, Nick, Whelley, Patrick, Calder, Eliza S.

“…Airborne thermal images of the Chaitén rhyolite lava dome were obtained on three occasions between January 2009 and January 2010. These images were useful for…”
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Experiences with the use of alkali free accelerators in Asia by Varley, Nick

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