Geological and geomechanical models of the pre-landslide volcanic edifice of Güímar and La Orotava mega-landslides (Tenerife)

Seisdedos, J.; Ferrer, Mercedes; Vallejo, Luis I. González de

doi:10.1016/j.jvolgeores.2012.06.013

Cited by 18 publications

(7 citation statements)

References 70 publications

(125 reference statements)

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“…This ratio must be also observed by the cohesion (C) of the elasto-plastic materials (C M = 50–100 Pa). Considering the range of cohesion ratio deduced we are simulating a volcano edifice with a cohesion of C N ≈ 0.9–2 MPa, similar to those proposed for fractured volcanic rock masses 29 .…”

Section: Methodssupporting

confidence: 68%

“…Considering a mean density value for the volcano of 2500 kg m −3 (ref. 29 ), we obtained a density ratio ρ* = 5.3 × 10 −1 . We combine the parameters L* and ρ* to deduce our mass ratio (M*): …”

Section: Methodsmentioning

confidence: 88%

“…As the density of natural volcano edifices is not well constrained, we checked the influence of the plausible variations of that value in our scaling. If we introduce a range of ± 100 kg m −3 in volcano density value 29 then the mass ratio range M* = 5.5 × 10 −13 – 5.1 × 10 −13 . For that range of values of ρ*, and a density for Golden Syrup at our working temperatures (23–24 °C) of 1440 kg m −3 (ref.…”

Section: Methodsmentioning

confidence: 99%

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Contrasting catastrophic eruptions predicted by different intrusion and collapse scenarios

Rincón

Márquez

Herrera

et al. 2018

Sci Rep

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Catastrophic volcanic eruptions triggered by landslide collapses can jet upwards or blast sideways. Magma intrusion is related to both landslide-triggered eruptive scenarios (lateral or vertical), but it is not clear how such different responses are produced, nor if any precursor can be used for forecasting them. We approach this problem with physical analogue modelling enhanced with X-ray Multiple Detector Computed Tomography scanning, used to track evolution of internal intrusion, and its related faulting and surface deformation. We find that intrusions produce three different volcano deformation patterns, one of them involving asymmetric intrusion and deformation, with the early development of a listric slump fault producing pronounced slippage of one sector. This previously undescribed early deep potential slip surface provides a unified explanation for the two different eruptive scenarios (lateral vs. vertical). Lateral blast only occurs in flank collapse when the intrusion has risen into the sliding block. Otherwise, vertical rather than lateral expansion of magma is promoted by summit dilatation and flank buttressing. The distinctive surface deformation evolution detected opens the possibility to forecast the possible eruptive scenarios: laterally directed blast should only be expected when surface deformation begins to develop oblique to the first major fault.

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Section: Methodssupporting

confidence: 68%

Section: Methodsmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 99%

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Contrasting catastrophic eruptions predicted by different intrusion and collapse scenarios

Rincón

Márquez

Herrera

et al. 2018

Sci Rep

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“…In the GRANDETEN research project, on the causes and mechanisms of the Canary islands megalandslides carried out by the authors of this paper [55][56][57], the megatsunami deposits of Tenerife and Lanzarote were described and identified as tsunami deposits, and new sites were described in Tenerife and Gran Canaria [9,10,58,59]. The excellent preservation condition of these deposits and their distinctive sedimentological and paleontological features with mixed marine and terrestrial fauna, constitute an exceptional source of information on megatsunami deposits.…”

Section: Flank Megalandslides and Tsunami Deposits In The Canary Islandsmentioning

confidence: 99%

Megatsunamis Induced by Volcanic Landslides in the Canary Islands: Age of the Tsunami Deposits and Source Landslides

et al. 2021

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Evidence for frequent, large landslides on the flanks of the volcanic edifices forming the Canary Islands include outstanding landslide scars and their correlative submarine and subaerial rock and debris avalanche deposits. These landslides involved volumes ranging from tens to hundreds of km3. The sudden entry of large volumes of rock masses in the sea may have triggered tsunamis capable of affecting the source and neighboring islands, with the resulting huge waves dragging coastal and seabed materials and fauna and redepositing them inland. Here, we present new geological evidence and geochronological data of at least five megatsunamis in Tenerife, Lanzarote, and Gran Canaria, triggered by island flank megalandslides, and occasionally explosive eruptions, during the last 1 million years. The exceptional preservation of the megatsunami deposits and the large area they cover, particularly in Tenerife, provide fundamental data on the number of tsunami events and run-ups, and allow proposals on the sources and age of the tsunamis. Tsunami run-up heights up to 290 m above coeval sea level, some of the highest known on Earth in recent geological times, were estimated based on sedimentological, geomorphological, paleontological, and geochronological data. The research results made it possible to estimate the recurrence of tsunamis in the archipelago during the last hundreds of thousands of years, and to establish relationships between tsunami deposits and the probable triggering island flank landslides.

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“…The used geotechnical parameters for MCMM for the different geotypes are summarized in Table 1. Geotechnical parameters for the different geotypes were extensively searched in the literature (Hoernle, 1998;Apuani et al, 2005;del Potro and Hürlimann, 2008;Rodríguez-Losada et al, 2009;Stow, 2009;Seisdedos et al, 2012;Ferrer et al, 2014;Cai et al, 2015) and adjusted with regards to El Hierro conditions. Parameters of fresh basalts, lava flows and collapse accumulations come from own laboratory investigation with the assumption of critical state mechanics (Muir Wood, 1990) and extrapolation from relevant rock testing cases (Olejár, 2018;Petružálek, 2018).…”

Section: Model Parametersmentioning

confidence: 99%

Current stability modelling of an incipient San Andres giant landslide on El Hierro Island, Canaries, Spain _ first attempt using limited input data.

Blahůt¹

2020

Acta Geodynamica Et Geomaterialia

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This paper presents first results from stability modelling of a deep-seated San Andrés Landslide located on the El Hierro Island, Canaries. It combines information from own surficial field surveys, geotechnical testing, literature and analogies from other parts of the island and Canary Islands in general. Despite using limited data a slope profile for modelling has been defined and several models have been calculated. These include variations in the rock properties, influence of seismic loading and differences in sea level. This first attempt shows that San Andrés Landslide is currently stable however; it might be reactivated as a result of an earthquake with minimum VII intensity. Even in seismically calm periods a creep might be induced by the unconsolidated sea sediments located at the toe of the landslide. However, more detailed information about the internal structure of the landslide and rock properties is needed for thorough conclusions.

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Geological and geomechanical models of the pre-landslide volcanic edifice of Güímar and La Orotava mega-landslides (Tenerife)

Cited by 18 publications

References 70 publications

Contrasting catastrophic eruptions predicted by different intrusion and collapse scenarios

Contrasting catastrophic eruptions predicted by different intrusion and collapse scenarios

Megatsunamis Induced by Volcanic Landslides in the Canary Islands: Age of the Tsunami Deposits and Source Landslides

Current stability modelling of an incipient San Andres giant landslide on El Hierro Island, Canaries, Spain _ first attempt using limited input data.

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