Rockfall detachment susceptibility map in El Hierro Island, Canary Islands, Spain

Show simple item record Fernández Hernández, Marta Paredes Bartolomé, Carlos Castedo Ruiz, Ricardo Llorente Isidro, Miguel Vega Panizo, Rogelio de la 2020-10-01T07:09:54Z 2020-10-01T07:09:54Z 2012-07-20
dc.identifier.citation Natural Hazards, vol.64, n.2, 1247–1271 es_ES
dc.identifier.issn 1573-0840
dc.description.abstract A semi-quantitative heuristic methodology is developed to map a rockfall detachment susceptibility zonation of El Hierro Island (Canary Archipelago). The rationalized procedure, which we called non-weighted bounded indicators, is based on overlapping thematic maps of conditioning factors to mass movement, which are appropriately and individually rescaled and then composed by addition to obtain a susceptibility numerical index through a GIS. As the consistency of the geomorphological analysis depends on the expert subjective criteria and the appropriate interpretation of the landscape, the use of this methodology reduces subjectivity and quantifies the degree of susceptibility. The main factors affecting the mass movement phenomena (rockfalls events), also recognized in the field and, therefore, considered in the presented GIS arrangement, are slope, profile curvature, lithology, vegetation cover and dykes density. To calculate the slope threshold or minimum angle characteristic of rockfall source areas, mixed Gaussian slope frequency decomposition is used. The curvature index reveals stepwise areas. Qualitative geomechanical characteristics are linked to a quantitative index according to a volcanic lithological-complexes classification. Both destabilization (root-wedging) and stabilization effects are considered into the vegetation cover index. The dyke density index incorporates the bearing rock capacity decrease produced in the halo around a dyke network intrusion. Slope, curvature and vegetation indexes thresholds have been fitted following field observations. A rockfall detachment susceptibility map is obtained and classified based on the histogram maxima. The rockfall inventory, based on rockfall events reported within the island, was used for the model validation. A 12% of the whole island shows medium to very high susceptibility es_ES
dc.description.sponsorship Departamento de Matemática Aplicada y Métodos Informáticos, Universidad Politécnica de Madrid, España es_ES
dc.description.sponsorship Departamento de Investigación y Prospectiva Geocientífica, Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Departamento de Explotación de Recursos Minerales y Obras Subterráneas, Universidad Politécnica de Madrid, España es_ES
dc.language.iso en es_ES
dc.publisher Springer es_ES
dc.rights Acceso abierto es_ES
dc.subject susceptibility map es_ES
dc.subject heuristic method es_ES
dc.subject semi-quantitative es_ES
dc.subject rockfall es_ES
dc.subject volcanic environment es_ES
dc.subject Hierro es_ES
dc.subject España es_ES
dc.title Rockfall detachment susceptibility map in El Hierro Island, Canary Islands, Spain es_ES
dc.type Postprint es_ES
dc.relation.publisherversion es_ES
dc.description.funder Instituto Geológico y Minero de España, España es_ES
dc.description.funder Universidad Politécnica de Madrid, España es_ES
dc.identifier.doi es_ES
dc.coverage.spatialStudy Isla de El Hierro, Canarias, España es_ES

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