A Decade of Monitoring and Research on the San Andrés Megalandslide on El Hierro, Canary Islands, Spain

Blahůt, Jan; Klimeš, Jan; Meletlidis, Stavros; Bálek, Jan; Rowberry, Matt; Baroň, Ivo

doi:10.1007/978-3-031-25042-2_12

Cited by 1 publication

(1 citation statement)

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“…The broad arcuate failure surface system, which defines the boundaries of the landslide mass to the northeast, is terminated to the southwest by an escarpment associated with the debris avalanches at Las Playas. Geological evidence suggests that the landslide mass is moving progressively to the east and southeast [55], while creep, in the order of 0.3 mm/yr, has recently been detected at its main detachment plane [56]. A possibly retrogressive failure plane was described 900 m inland from the main entrance of the abandoned water gallery (Figure 2) and developed in fractured olivine-pyroxene massive basalts with well-preserved sub-vertical slickensides and a soft clay infill [51].…”

Section: The San Andrés Landslide (Sal)mentioning

confidence: 99%

New Insights into the Internal Structures and Geotechnical Rock Properties of the Giant San Andrés Landslide, El Hierro Island, Spain

et al. 2023

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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.

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Section: The San Andrés Landslide (Sal)mentioning

confidence: 99%