Geologic evolution of the Canarian Islands of Lanzarote, Fuerteventura, Gran Canaria and La Gomera and comparison of landslides at these islands with those at Tenerife, La Palma and El Hierro

Acosta, Juan; Uchupi, Elazar; Muñoz, Araceli; Herranz, P.; Palomo, C.; Ballesteros, M.

doi:10.1007/1-4020-4352-x_1

Cited by 28 publications

(38 citation statements)

References 66 publications

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“…The fossil beaches have been interpreted as the result of Pleistocene sea-level fluctuations (Carracedo, 1999;Acosta et al, 2003). In the Central Atlantic during the past 500 ka the sea-level has been situated in the time periods $400 ka with 18-20 m, $300 ka with 3 m and $125-130 ka with 6-10 m ASL (Hearty and Kaufmann, 2000) (Fig.…”

Section: Discussionmentioning

confidence: 99%

Fossil beaches as evidence for significant uplift of Tenerife, Canary Islands

Kröchert

Maurer

Buchner

2008

Journal of African Earth Sciences

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Section: Discussionmentioning

confidence: 99%

Fossil beaches as evidence for significant uplift of Tenerife, Canary Islands

Kröchert

Maurer

Buchner

2008

Journal of African Earth Sciences

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“…For example, the slope of the subaerial parts of Kīlauea and Mauna Loa is mostly 4-8 • (Walker, 2000). Large landslides are common in basaltic edifices (Oehler et al, 2005;Thompson et al, 2008), such as around the Big Island of Hawaii (Moore et al, 1994), the Canary Islands (Acosta et al, 2005), and Réunion (Oehler et al, 2005). Many large landslides are submarine; others are subaerial.…”

mentioning

confidence: 99%

Strengths and strain energies of volcanic edifices: implications for eruptions, collapse calderas, and landslides

Guðmundsson

2012

Nat. Hazards Earth Syst. Sci.

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Abstract. Natural hazards associated with volcanic edifices depend partly on how fracture resistant the edifices are, i.e. on their strengths. Observations worldwide indicate that large fluid-driven extension fractures (dikes, inclined sheets), shear fractures (landslides), and mixed-mode fractures (ring dikes and ring faults) normally propagate more easily in a basaltic edifice (shield volcano) than in a stratovolcano. For example, dike-fed eruptions occur once every few years in many basaltic edifices but once every 10 2−3 yr in many stratovolcanoes. Large landslides and caldera collapses also appear to be more common in a typical basaltic edifice/shield volcano than in a typical stratovolcano. In contrast to a basaltic edifice, a stratovolcano is composed of mechanically dissimilar rock layers, i.e. layers with mismatching elastic properties (primarily Young's modulus). Elastic mismatch encourages fracture deflection and arrest at contacts and increases the amount of energy needed for a large-scale edifice failure. Fracture-related hazards depend on the potential energy available to propagate the fractures which, in turn, depends on the boundary conditions during fracture propagation. Here there are two possible scenarios: one in which the outer boundary of the volcanic edifice or rift zone does not move during the fracture propagation (constant displacement); the other in which the boundary moves (constant load). In the former, the total potential energy is the strain energy stored in the volcano before fracture formation; in the latter, the total potential energy is the strain energy plus the work done by the forces moving the boundary. Constantdisplacement boundary conditions favor small eruptions, landslides, and caldera collapses, whereas constant-load conditions favor comparatively large eruptions, landslides, and collapses. For a typical magma chamber (sill-like with a diameter of 8 km), the strain energy change due to magmachamber inflation is estimated at the order of 10 14 J (0.1 PJ).For comparison, the surface energy needed to form a typical feeder dike is of the same order of magnitude, or 10 14 J. There are several processes besides magma-chamber inflation that may increase the strain energy in a volcano before eruption. Thus, during a typical unrest period with magmachamber inflation, the added strain energy in the volcano is large enough for a typical feeder dike to form. An injected dike, however, only reaches the surface and becomes a feeder if it is able to propagate through the numerous layers and contacts that tend to deflect or arrest dikes. The strong elastic mismatch between layers that constitute stratovolcanoes not only encourages fracture arrest, but also the storage of more strain energy (than in a typical basaltic edifice/shield volcano) before fracture formation and failure. It is thus through producing materials of widely different mechanical properties that stratovolcanoes become strong and resilient.

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“…In this geodynamical context, the western islands are the oldest in the archipelago (Acosta et al 2003). Starting from the biggest one, Tenerife, a brief geological description of each island is now introduced.…”

Section: Test Site Characterizationmentioning

confidence: 99%

Fast detection of ground motions on vulnerable elements using Sentinel-1 InSAR data

Solari

Barra

Herrera

et al. 2017

Geomatics, Natural Hazards and Risk

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The detection of active movements that could threat the infrastructures and the population is one of the main priorities of the risk management chain. Interferometric Synthetic Aperture Radar (InSAR) techniques represent one of the most useful answers to this task; however, it is difficult to manage the huge amount of information derived from the interferometric analysis. In this work, we present a procedure for deriving impact assessment maps, over a regional test site, using as starting point Sentinel-1 SAR (Synthetic Aperture Radar) images and a catalogue of elements at risk that acts as a second input of the methodology. We applied the proposed approach, named as Vulnerable Elements Activity Maps (VEAM), to the islands of Gran Canaria, La Gomera and Tenerife (Spain), where we analysed SAR images covering the time interval November 2014-September 2016. The methodology, meant to be a powerful tool for reducing the time needed for a complete analysis of a full stack of InSAR data, is ideally suited for Civil Protection Authorities. The application of the methodology allowed to detect 108 areas affected by active deformation that are threatening one or more elements at risk in 25 municipalities of the three islands.

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Geologic evolution of the Canarian Islands of Lanzarote, Fuerteventura, Gran Canaria and La Gomera and comparison of landslides at these islands with those at Tenerife, La Palma and El Hierro

Cited by 28 publications

References 66 publications

Fossil beaches as evidence for significant uplift of Tenerife, Canary Islands

Fossil beaches as evidence for significant uplift of Tenerife, Canary Islands

Strengths and strain energies of volcanic edifices: implications for eruptions, collapse calderas, and landslides

Fast detection of ground motions on vulnerable elements using Sentinel-1 InSAR data

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