Geomechanical behavior evolution of the rock mass involved in the Arteara rock avalanche, Gran Canaria, Canary Islands, Spain

In Arteara (Canary Island), a Holocene rock avalanche comprises accumulation of large reddish blocks which cover the Fataga ravine. This course, is entrenched into the Phonolitic Formation, an alternating sequence of lava flows and ignimbrites. The avalanche defines an elongated deposit of variable...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2021-08, Vol.833 (1), p.12057
Main Authors: Antón-Bayona, L M, Rodríguez-Peces, M J, Yepes, J
Format: Article
Language:English
Subjects:
Abrasion
Anisotropy
Avalanches
Banded structure
Bedrock
Bulk density
Fluid dynamics
Geomechanics
Hammers
Hardness
Holocene
Lava
Lava flows
Porosity
Rock masses
Rocks
Saltation
Turbulence
Turbulent flow
Variable thickness
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Summary:In Arteara (Canary Island), a Holocene rock avalanche comprises accumulation of large reddish blocks which cover the Fataga ravine. This course, is entrenched into the Phonolitic Formation, an alternating sequence of lava flows and ignimbrites. The avalanche defines an elongated deposit of variable thickness. A low friction angle was deduced, which is related to an easily weathered bedrock favorable to the rolling of the blocks. The movement would have been a dry granular flow with a component of saltation at the head and of turbulent flow at the intermediate and distal areas. The deposit varies widely in size and is structured in bands of blocks with a polymodal distribution and low selection. The geomechanical properties of the rocks involved vary substantially in each block and along a longitudinal profile of the deposit. Schmidt Hammer rebound measured in 233 blocks show a polymodal dispersion. Some facies have been differentiated in the blocks, not only by their appearance, but also by their rebound index (R). The different hardness reflects the differences in density and porosity. The hardness zoning shows the differential weathering of the blocks, which depends on the rock anisotropy and the flow turbulence, which determines the influence of abrasion and punching of the blocks. The rebound shows a direct correlation with the bulk density and an inverse correlation with the distance to the source area.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/833/1/012057