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Rodriguez, Fátima
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Rodriguez, Fátima
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- PublicationOpen AccessThe initial phase of the 2021 Cumbre Vieja ridge eruption (Canary Islands): Products and dynamics controlling edifice growth and collapse(2022)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;; ; ; ; ; ; ; ; ; ; ; ;; ; ; ; ;; Tajogaite cone in the Cumbre Vieja ridge (La Palma, Canary Islands) erupted between 19 September and 13 December 2021. The tephra and lava sourced from the newly formed fissure rapidly built a pyroclastic cone. During the early days of eruption and after several small-scale landslides, the west flank of the edifice partially collapsed on 25 September, breaching the cone and emplacing a prominent raft-bearing lava flow. Our research combines direct observations, digital elevation models, thermal and visible imaging, and textural and compositional investigation of the explosive products to describe and characterize the edifice growth and collapse. The cone built over a steep slope (26◦) and its failure occurred after an intense phase of lava fountaining (up to 30 m3 s 1) that produced rapid pyroclastic accumulation. We suggest that an increased magma supply, to an ascent rate of 0.30 m s 1, led to the rapid growth of the cone (at 2.4 × 106 m3 day 1). Simultaneously, the SW lava flow reactivated and formed a lava ‘seep’ that undercut the flank of the cone, triggering a lateral collapse via rotational rockslide that moved at minimum speeds of 34–70 m h 1. The lateral collapse formed a ~ 200 m wide scar, involving 5.5 × 106 m3 of material, and covered 1.17 km2 with decametric edifice portions and raft-bearing lava. The collapse produced a modest change in the vent geometry, but did not affect eruptive activity long term. A short pause in the eruption after the collapse may have been favored by rapid emptying of the shallower magma system, reducing ascent rates and increasing crystallization times. These results reveal the complex chain of events related to the growth and destruction of newly formed volcanic cones and highlight hazards when situated close to inhabited areas.439 26 - 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.161 100 - PublicationOpen AccessTemporal variability of explosive activity at Tajogaite volcano, Cumbre Vieja (Canary Islands), 2021 eruption from ground-based infrared photography and videography(2023-09-12)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;The 2021 eruption at Tajogaite (Cumbre Vieja) volcano (La Palma, Spain) was characterized by Strombolian eruptions, Hawaiian fountaining, white gasdominated and grey ash-rich plumes, and lava effusion from multiple vents. The variety of eruptive styles displayed simultaneously and throughout the eruption presents an opportunity to explore controls on explosivity and the relationship between explosive and effusive activity. Explosive eruption dynamics were recorded using ground-based thermal photography and videography. We show results from the analysis of short (<5 min) near-daily thermal videos taken throughout the eruption from multiple ground-based locations and continuous time-lapse thermal photos over the period November 16 to November 26. We measure the apparent radius, velocity, and volume flux of the high-temperature gas-and-ash jet and lava fountaining behaviors to investigate the evolution of the explosive activity over multiple time scales (seconds-minutes, hours, and daysweeks). We find fluctuations in volume flux of explosive material that correlate with changes in volcanic tremor and hours-long increases in explosive flux that are immediately preceded by increases in lava effusion rate. Correlated behavior at multiple vents suggests dynamic magma ascent pathways connected in the shallow (tens to hundreds of meters) sub-surface. We interpret the changes in explosivity and the relative amounts of effusive and explosivity to be the result of changes in gas flux and the degree of gas coupling.175 39 - PublicationOpen AccessSatellite and Ground Remote Sensing Techniques to Trace the Hidden Growth of a Lava Flow Field: The 2014-15 Effusive Eruption at Fogo Volcano (Cape Verde)(2018-07-12)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Fogo volcano erupted in 2014–2015 producing an extensive lava flow field in the summit caldera that destroyed two villages, Portela and Bangaeira. The eruption started with powerful explosive activity, lava fountains, and a substantial ash column accompanying the opening of an eruptive fissure. Lava flows spreading from the base of the eruptive fissure produced three arterial lava flows. By a week after the start of the eruption, a master lava tube had already developed within the eruptive fissure and along the arterial flow. In this paper, we analyze the emplacement processes based on observations carried out directly on the lava flow field, remote sensing measurements carried out with a thermal camera, SO2 fluxes, and satellite images, to unravel the key factors leading to the development of lava tubes. These were responsible for the rapid expansion of lava for the ~7.9 km length of the flow field, as well as the destruction of the Portela and Bangaeira villages. The key factors leading to the development of tubes were the low topography and the steady magma supply rate along the arterial lava flow. Comparing time-averaged discharge rates (TADR) obtained from satellite and Supply Rate (SR) derived from SO2 flux data, we estimate the amount and timing of the lava flow field endogenous growth, with the aim of developing a tool that could be used for hazard assessment and risk mitigation at this and other volcanoes.278 94