Development and recent activity of the San Andrés landslide on El Hierro, Canary Islands, Spain

Show simple item record Klimes, Jan Yepes, Jorge Becerril, Laura Kusák, Michal Galindo Jiménez, Inés Blahut, Jan 2020-10-01T08:12:51Z 2020-10-01T08:12:51Z 2016-02-18
dc.identifier.citation Geomorphology, 2016, v. 261, 119–131 es_ES
dc.identifier.issn 0169-555X
dc.description.abstract Extremely voluminous landslides with a long run-out (also known as megalandslides) on oceanic volcanic islands are infrequent denudational processes on such islands. At the same time, they represent a major geological hazard that must be looked into to avoid negative consequences for the inhabitants of these islands. Their occurrence can be related to periods of intense seismo-volcanic activity, similar to that which occurred on El Hierro Island over 2011-2012. Landslides on volcanic islands are studied using onshore and offshore geological, geophysical and geomorphological records, considering their unique triggering conditions (e.g. lava intrusions, eruptive vents, magma chamber collapses). Previous work has pointed out similarities between specific cases of landslides on volcanic islands and deep-seated gravitational slope deformations (DSGSDs) which are typical in high mountain settings. Nevertheless, the methodological approaches and concepts used to investigate DSGSDs are not commonly applied on volcanic islands studies, even though their use may provide new information about the development stage, recent movements and future hazards. Therefore, this approach for studying the San Andrés landslide (SAL) on El Hierro (Canary Islands) has been developed applying a detailed morphological field mapping, an interpretation of digital elevation models, structural measurements, kinematic testing, and a precise movement monitoring system. The acquired information revealed a strong structural influence on the landslide morphology and the presence of sets of weakened planes acting as the sliding surfaces of the SAL or secondary landslides within its body. The presence of secondary landslides, deep erosive gullies, coastal cliffs and high on-shore relative relief also suggests a high susceptibility to future landslide movement. Direct monitoring on the landslide scarps and the slip plane, performed between February 2013 and July 2014, using an automated optical-mechanical crack gauge with a precision of up to 10-2 mm, detected creep movement in the order of 1 mm yr-1 with a persistent sinistral component as well as episodic horizontal and a subtle vertical movement. This monitoring will continue in the future in order to verify the initial observations, which instead of long-term movement patterns, could represent a landslide response to the period of an intense seismo-volcanic activity during 2011-12. es_ES
dc.description.sponsorship Institute of Rock Structure and Mechanics, Czech Academy of Sciences, República Checa es_ES
dc.description.sponsorship Departamento de Ingeniería Civil, Universidad de Las Palmas de Gran Canaria, España es_ES
dc.description.sponsorship Institut de Ciències de la Terra, Jaume Almera, España es_ES
dc.description.sponsorship Department of Physical Geography and Geoecology, Charles University in Prague, República Checa es_ES
dc.description.sponsorship Unidad de Canarias, Instituto Geológico y Minero de España, España es_ES
dc.language.iso en es_ES
dc.publisher Elsevier es_ES
dc.publisher International Geosynthetics Society (IGS) es_ES
dc.rights Acceso abierto es_ES
dc.subject Deep-seated gravitational slope deformations (DSGSDs) es_ES
dc.subject creep movements es_ES
dc.subject landslide monitoring es_ES
dc.subject deslizamientos submarinos es_ES
dc.subject vulcanismo es_ES
dc.title Development and recent activity of the San Andrés landslide on El Hierro, Canary Islands, Spain es_ES
dc.type Preprint es_ES
dc.relation.publisherversion es_ES
dc.identifier.doi es_ES
dc.coverage.spatialStudy Isla de El Hierro, Islas Canarias, España es_ES

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