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Age and geometry of an aborted rift flank collapse: the San Andres fault system, El Hierro, Canary Islands

Published online by Cambridge University Press:  01 July 1997

S. J. DAY
Affiliation:
Department of Geography & Geology, Cheltenham & Gloucester College of Higher Education, Francis Close Hall, Swindon Road, Cheltenham GL50 4AZ, UK
J. C. CARRACEDO
Affiliation:
Estacion Volcanologica de Canarias, CSIC, Aptdo. Correos 195, La Laguna 38206, Tenerife, Canary Islands, Spain
H. GUILLOU
Affiliation:
Centre des Faibles Radioactivities, Laboratoire Mixte CEA-CNRS, 91198 Gif-Sur-Yvette, France

Abstract

The catastrophic slope failures and landslides that occur in the final stages of lateral collapses of volcanoes destroy much of the evidence for precursory deformation and the early stages of the collapses concerned. Aborted or incomplete collapse structures, although rare, are rich sources of information on these stages of development of catastrophic collapses. The San Andres fault system, on the volcanic island of El Hierro, is a relatively young (between about 545 and about 261–176 ka old) but inactive lateral collapse structure. It appears to represent an aborted giant landslide. It is developed along the flank of a steep-sided volcanic rift zone, and is bounded by a discrete strike-slip fault zone at the up-rift end, closest to the centre of the island. This geometry differs markedly from that of collapse structures on stratovolcanoes but bears some similarities to that of active fault systems on Hawaii. Although the fault system has undergone little erosion, cataclasites which formed close to the palaeosurface are well exposed. These cataclasites are amongst the first fault rocks to be described from volcano lateral collapse structures and include the only pseudotachylytes to have been identified in such structures to date. Their development at unusually shallow depths is attributed to large movements on the fault in a single event, the inferred aborted landslide, and a lack of pressurized pore water. The absence of pressurized fluids in the slumping block may have caused the San Andres fault system to cease moving, rather than develop into a giant volcanic landslide. The recognition that the San Andres fault system is inactive greatly reduces the estimated volcanic hazard associated with El Hierro. However, the lack of evidence for precursory deformation prior to the aborted landslide event is disturbing as it implies that giant lateral collapses can occur on steep-sided oceanic islands with little warning.

Type
Research Article
Copyright
© 1997 Cambridge University Press

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