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Calvo, D.
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Calvo, D.
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- PublicationOpen AccessAn Increasing Trend of the Diffuse CO2 Emission from Teide Volcano (Tenerife, Canary Islands): A Premonitory Geochemical Signature of Volcanic Activity Changes at Tenerife?(2010-05-31)
; ; ; ; ; ; ; ; ; ; ; ;Pérez, N.M.; Environmental Research Division, ITER, Tenerife/Spain ;Hernandez, P.A.; Environmental Research Division, ITER, Tenerife/Spain ;Melian, G.; Environmental Research Division, ITER, Tenerife/Spain ;Padron, E.; Environmental Research Division, ITER, Tenerife/Spain ;Nolasco, D.; Environmental Research Division, ITER, Tenerife/Spain ;Barrancos, J.; Environmental Research Division, ITER, Tenerife/Spain ;Marrero, R.; Environmental Research Division, ITER, Tenerife/Spain ;Padilla, G.; Environmental Research Division, ITER, Tenerife/Spain ;Calvo, D; Environmental Research Division, ITER, Tenerife/Spain ;Rodriguez, F.; Environmental Research Division, ITER, Tenerife/Spain ;Chiodini, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; ; ; ; ; ; ; ; ;; We report the results of 11 soil CO2 efflux surveys at the summit cone of Teide volcano (SCT), Tenerife. The surveys were undertaken from 1997 to 2009 to determine the scale of total CO2 emissions at the SCT and to evaluate the temporal variations of CO2 efflux and their relationships with the volcanic-seismic activity. Our results reveal significant fluctuations, which do not seem to be masked by external variations, standing out from the rest the ones measured in 2001, and the increasing trend observed from 2007 to 2009, both having similar shapes, intensities, and emission rates. The significant pulse observed in total CO2 emission in 2001 provided the first geochemical observation supporting unrest of the volcanic system, as it was addressed later by anomalous seismic activity recorded in Tenerife Island during April 22-29, 2004 (IGN). The new increasing trend observed from 2007, might be precursor of new anomalous volcanic-seismic activity in the next future, suggesting that subsurface magma movement is the cause for the observed changes in the total output of diffuse CO2 emission at SCT.161 101 - PublicationRestrictedMagma emission rates fromshallow submarine eruptions using airborne thermal imaging(2014-09)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Hernández, P. A. ;Calvari, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Ramos, A. ;Pérez, N. M. ;Márquez, A. ;Quevedo, R. ;Barrancos, J. ;Padrón, E. ;Padilla, G. D. ;López, D. ;Rodríguez Santana, A. ;Melián, G. V. ;Dionis, S. ;Rodríguez, F. ;Calvo, D. ;Spampinato, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;; ; ; ; ; ; ; ; ; ; ; ; ; ;The effusion rate is the most important parameter to gatherwhen a volcanic eruption occurs, because it controls the way inwhich a lava body grows, extends and expands, influencing its dimensional properties. Calculation of lava flow volume from thermal images collected by helicopter surveys has been largely used during the last decade for monitoring subaerial effusive eruptions. However, due to the depths where volcanic activity occurs, monitoring submarine volcanic eruptions is a very difficult task. The 2011–2012 submarine volcanic eruption at El Hierro, Canary Islands, has provided a unique and excellent opportunity to monitor eruptive processes occurring on the seabed. The use of a hand-held thermal camera during daily helicopter flights allowed us to estimate for the first time the daily and total erupted magma volumes from a submarine eruption. The volume of magma emitted during this eruption has been estimated at 300 Mm3, giving an average effusion rate of ~25 m3 s−1. Thermal imagery by helicopter proved to be a fast, inexpensive, safe and reliable technique of monitoring volcanic eruptions when they occur on the shallow seabed.428 47 - PublicationRestrictedThermal insights into the dynamics of Nyiragongo lava lake from ground and satellite measurements(2013-10-30)
; ; ; ; ; ; ; ; ; ;Spampinato, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Ganci, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Hernandez, P. A. ;Calvo, D. ;Tedesco, D. ;Perez, N. M. ;Calvari, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Del Negro, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Yalire, M. M.; ; ; ; ; ;; ; We present new insights into the short- and long-term thermal activity of the Nyiragongo lava lake by ground-based and satellite infrared thermal imagery recorded in the first half of 2012. This is the very first time in which FLIR camera and SEVIRI data have been compared at this volcano. Maximum temperatures recorded at the molten lava were of ~1180 K, whereas the lake skin remained always below ~734 K in areas far from the upwelling zone and below ~843 K in those proximal to the source region. Ground-based imagery yielded mean radiative power values between ~0.80 and 1.10 GW. Consistently, satellite observations showed similar mean values of 1.10 GW. Overall the thermal activity of the lava lake was quite variable along the three days of field measurements at both daily and intradaily scale. SEVIRI radiative power values retrieved for the January–June 2012 period revealed fluctuations within the same variability range suggesting that no significant changes of the lava lake area had occurred over the six months. Comparison with previous radiative power estimates showed that our data well agree with the general increasing trend recorded since the reappearance of the lava lake after the last flank eruption in 2002.303 23