Assessing the potential for future explosive activity from Teide–Pico Viejo stratovolcanoes (Tenerife, Canary Islands)

Martı́, Joan; Geyer, Adelina; Andújar, Joan; Teixido, F.; Costa, Fidel

doi:10.1016/j.jvolgeores.2008.07.011

Cited by 52 publications

(75 citation statements)

References 44 publications

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“…These edifices and their numerous flank-vents have emitted mainly basanites, tephrites and phonolites which have filled the Las Cañadas caldera and the Icod Valley (Ablay and Martí, 2000) and which extend also to La Orotava Valley. A trend to more evolved magmas and more explosive activity during this cycle has been described by Martí et al (2008), similarly to the three previous cycles. The last highly-explosive felsic eruption in the central volcanic complex was that of Montaña Blanca in the southeastern flank of Teide, dated at~2 ka BP (Ablay et al, 1995).…”

Section: Geological Settingsupporting

confidence: 75%

Hydrothermal system of Central Tenerife Volcanic Complex, Canary Islands (Spain), inferred from self-potential measurements

Villasante-Marcos¹,

Finizola²,

Abella³

et al. 2014

Journal of Volcanology and Geothermal Research

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a b s t r a c tAn extensive self-potential survey was carried out in the central volcanic complex of Tenerife Island (Canary Islands, Spain). A total amount of ~237 km of profiles with 20 m spacing between measurements was completed, including radial profiles extending from the summits of Teide and Pico Viejo, and circular profiles inside and around Las Cañadas caldera and the northern slopes of Teide and Pico Viejo. One of the main results of this map-ping is the detection of well-developed hydrothermal systems within the edifices of Teide and Pico Viejo, and also associated with the flank satellite M. Blanca and M. Rajada volcanoes. A strong structural control of the surface manifestation of these hydrothermal systems is deduced from the data, pointing to the subdivision of Teide and Pico Viejo hydrothermal systems in three zones: summit crater, upper and lower hydrothermal systems. Self-potential maxima related to hydrothermal activity are absent from the proximal parts of the NE and NW rift zones as well as from at least two of the mafic historical eruptions (Chinyero and Siete Fuentes), indicating that long-lived hydrothermal systems have developed exclusively over relatively shallow felsic magma reser-voirs. Towards Las Cañadas caldera floor and walls, the influence of the central hydrothermal systems disappears and the self-potential signal is controlled by the topography, the distance to the water table of Las Cañadas aqui-fer and its geometry. Nevertheless, fossil or remanent hydrothermal activity at some points along the Caldera wall, especially around the Roques de García area, is also suggested by the data. Self-potential data indicate the existence of independent groundwater systems in the three calderas of Ucanca, Guajara and Diego Hernández, with a funnel shaped negative anomaly in the Diego Hernández caldera floor related to the subsurface topogra-phy of the caldera bottom. Two other important self-potential features are detected: positive values towards the northwestern Santiago rift, possibly due to the relatively high altitude of the water-table in this area; and a linear set of minima to the west of Pico Viejo, aligned with the northwestern rift and related to meteoric water infiltra-tion along its fracture system.

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Section: Geological Settingsupporting

confidence: 75%

Hydrothermal system of Central Tenerife Volcanic Complex, Canary Islands (Spain), inferred from self-potential measurements

Villasante-Marcos¹,

Finizola²,

Abella³

et al. 2014

Journal of Volcanology and Geothermal Research

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“…We chose lava flows, ash fall and pyroclastic density currents (PDC) as the three main hazards that can be expected in a phonolitic eruption from TPV, based on what can be seen in the geological record (Martí et al 2008b;García et al 2011) Simulations were performed considering different vents, including central vents located at both craters of Teide and Pico Viejo and flank vents located around TPV edifice at approximately 2,300 ma.s.l. Both kinds of eruptions can be expected in TPV, as shown in the Holocene eruptive record and in numerical studies simulating magma emplacement inside TPV (Martí and Geyer 2009).…”

Section: Eruptive Scenariosmentioning

confidence: 99%

“…This restricts the existing techniques for forecasting its future behaviour to within a minimum margin of confidence. However, different efforts have been made to assess volcanic hazard at TPV in the form of event tree structures representing possible eruptive scenarios and using the available geological and geophysical information (Martí et al 2008b;Sobradelo and Martí 2010). Bayesian inference and expert judgement elicitation techniques have been applied to these event trees to estimate the long-term probability for each scenario within a given time window.…”

Section: Introductionmentioning

confidence: 99%

Eruptive scenarios of phonolitic volcanism at Teide–Pico Viejo volcanic complex (Tenerife, Canary Islands)

et al. 2011

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Recent studies on Teide-Pico Viejo (TPV) complex have revealed that explosive activity of phonolitic and basaltic magmas, including plinian and subplinian eruptions, and the generation of a wide range of pyroclastic density currents (PDCs) have also been significant. We perform a statistical analysis of the time series of past eruptions and the spatial extent of their erupted products, including lava flows, fallout and PDCs. We use an extreme value theory statistical method to calculate eruption recurrence. The analysis of past activity and extent of some well-identified deposits is used to calculate the eruption recurrence probabilities of various sizes and for different time periods. With this information, we compute several significant scenarios using the GIS-based VORIS 2 software (Felpeto et al., J Volcanol Geotherm Res 166: [106][107][108][109][110][111][112][113][114][115][116] 2007) in order to evaluate the potential extent of the main eruption hazards that could be expected from TPV. The simulated hazard scenarios show that the southern flank of Tenerife is protected by Las Cañadas caldera wall against lava flows and pyroclastic density currents, but not against ash fallout. The Icod Valley, and to a minor extent also the La Orotava valley, is directly exposed to most of TPV hazards, in particular to the gravity driven flows. This study represents a step forward in the evaluation of volcanic hazard at TPV with regard to previous studies, and the results obtained should be useful for intermediate and long-term land-use and emergency planning.

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“…It cannot be denied that significant improvement is needed to achieve an effective management of the known volcanic risk in the Canary Islands. This is especially worrying for Tenerife, where there is a potentially very dangerous volcano (Teide), on an island of just over 2000 km 2 , in which one million people live (García et al 2006;Marrero et al 2012;Martí et al 2008;Tárraga et al 2008), and where no educational programs have yet been applied.…”

Section: Discussionmentioning

confidence: 99%

Legal framework and scientific responsibilities during volcanic crises: the case of the El Hierro eruption (2011–2014)

et al. 2015

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In recent years concerns have been growing in the scientific community over the definition of scientific responsibilities during emergencies, and the legal status of scientists involved in the corresponding decision-making. It is clear that the legal framework is one of the main elements affecting this issue; however, many factors may affect both the specific scientific decision-making and the definition of general scientific responsibilities. The situation will vary depending on the type and scale of emergency, and from place to place, even in the same country. There will be no such thing as a single, ideal solution. In the latest El Hierro volcanic crisis many factors have negatively affected the scientific management and have prevented an adequate definition of scientific responsibility. These factors have been detected and documented by the authors. They include excessive pressure due to human and economic issues, a poor legal framework with identifiable deficiencies, an Emergency Plan in which the Volcanic Activity/Alert Level (VAL), Emergency Response Level (ERL) and Volcanic Traffic Light (VTL) have been too rigidly linked, serious weaknesses in the management and structure of the Scientific Committee (SC), and more. Even though some of these problems have now been detected and certain solutions have already been proposed, the slowness and complexity of the bureaucratic processes are making it difficult to implement solutions.

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Assessing the potential for future explosive activity from Teide–Pico Viejo stratovolcanoes (Tenerife, Canary Islands)

Cited by 52 publications

References 44 publications

Hydrothermal system of Central Tenerife Volcanic Complex, Canary Islands (Spain), inferred from self-potential measurements

Hydrothermal system of Central Tenerife Volcanic Complex, Canary Islands (Spain), inferred from self-potential measurements

Eruptive scenarios of phonolitic volcanism at Teide–Pico Viejo volcanic complex (Tenerife, Canary Islands)

Legal framework and scientific responsibilities during volcanic crises: the case of the El Hierro eruption (2011–2014)

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