Article (Scientific journals)
New Insights into the Internal Structures and Geotechnical Rock Properties of the Giant San Andrés Landslide, El Hierro Island, Spain
Klimeš, Jan; Hussain, Yawar; Mreyen, Anne-Sophie et al.
2023In Remote Sensing, 15 (6), p. 1627
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Keywords :
General Earth and Planetary Sciences
Abstract :
[en] The San Andrés landslide on El Hierro (Canary Islands) represents a rare opportunity to study an incipient volcanic island flank collapse with an extensive onshore part. The presented research improves the knowledge of the internal structure and rock characteristics of a mega-landslide before its complete failure. The investigation combines multiple geophysical measurement techniques (active and passive seismic) and remotely sensed, high spatial resolution surveys (unmanned aerial vehicle) with in situ and laboratory geotechnical descriptions to characterize the rock properties inside and outside the San Andrés landslide. The available geophysical and geological data have been integrated into 3D geomodels to enhance their visual interpretation. The onshore geophysical investigations helped detect the possible San Andrés landslide sliding surfaces at depths between 320 m and 420 m, with a rather planar geometry. They also revealed that rocks inside and outside of the landslide had similar properties, which suggests that the previous fast movements of the landslide did not affect the bulk properties of the displaced rocks as the failure chiefly occurred along the weakened sliding plane. Uniaxial strength tests on basalt rocks further indicate a high variability and spatial heterogeneity of the rock strength properties due to the different types of volcanic rocks and their texture. The new information on the rock properties and structural setting of the San Andrés landslide can now be used to develop realistic geotechnical slope models of the onshore part of the flank collapse that are possibly applicable for slope stability or deformation calculations. It will also help assess related hazards marked by a low occurrence probability and a high impact potential.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Klimeš, Jan;  Institute of Rock Structure & Mechanics, Czech Academy of Sciences, V Holešovičkách 41, 18209 Prague, Czech Republic
Hussain, Yawar  ;  Université de Liège - ULiège > Département de géologie > Géologie de l'environnement ; Earth Sciences Department of Sapienza University of Rome, Research Center for Geological Risks (CERI), 00185 Rome, Italy
Mreyen, Anne-Sophie  ;  Université de Liège - ULiège > Urban and Environmental Engineering
Cauchie, Léna  ;  Université de Liège - ULiège > Département de géologie
Schlögel, Romy ;  Department of Geology, Faculty of Sciences, University of Liege, 4000 Liege, Belgium
Piroton, Valentine  ;  Université de Liège - ULiège > Département de géologie > Géologie de l'environnement
Petružálek, Matěj;  Institute of Geology, Czech Academy of Sciences, Puškinovo náměstí 447/9, 16000 Prague, Czech Republic
Blahůt, Jan ;  Institute of Rock Structure & Mechanics, Czech Academy of Sciences, V Holešovičkách 41, 18209 Prague, Czech Republic
René, Miloš ;  Institute of Rock Structure & Mechanics, Czech Academy of Sciences, V Holešovičkách 41, 18209 Prague, Czech Republic
Meletlidis, Stavros;  Centro Geofísico de Canarias, Instituto Geográfico Nacional, Calle La Marina 20, 38001 Santa Cruz de Tenerife, Spain
Havenith, Hans-Balder  ;  Université de Liège - ULiège > Département de géologie > Géologie de l'environnement
Language :
English
Title :
New Insights into the Internal Structures and Geotechnical Rock Properties of the Giant San Andrés Landslide, El Hierro Island, Spain
Publication date :
17 March 2023
Journal title :
Remote Sensing
eISSN :
2072-4292
Publisher :
MDPI AG
Special issue title :
"Landslide Studies Integrating Remote Sensing and Geophysical Data"
Volume :
15
Issue :
6
Pages :
1627
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Mobility Plus project of the Czech Academy of Sciences
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
CAS - Czech Academy of Sciences [CZ]
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since 22 March 2023

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