The effects of flank collapses on volcano plumbing systems

Manconi, Andrea, Longpré, Marc-Antoine, Walter, Thomas R., Troll, Valentin R. and Hansteen, Thor (2009) The effects of flank collapses on volcano plumbing systems Geology, 37 (12). pp. 1199-1102. DOI 10.1130/G30104A.1.

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The growth of large volcanoes is commonly interrupted by episodes of flank collapse that may be accompanied by catastrophic debris avalanches, explosive eruptions, and tsunamis. El Hierro, the youngest island of the Canary Archipelago, has been repeatedly affected by such mass-wasting events in the last 1 Ma. Our field observations and petrological data suggest that the largest and most recent of these flank collapses—the El Golfo landslide—likely influenced the magma plumbing system of the island, leading to the eruption of higher proportions of denser and less evolved magmas. The results of our numerical simulations indicate that the El Golfo landslide generated pressure changes exceeding 1 MPa down to upper-mantle depths, with local amplification in the surroundings and within the modeled magma plumbing system. Stress perturbations of that order might drastically alter feeding system processes, such as degassing, transport, differentiation, and mixing of magma batches.

Document Type: Article
Keywords: Flank collapse, volcanoes, El Hierro, Canary Archipelago, El Golfo landslide
Research affiliation: GFZ
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
DOI etc.: 10.1130/G30104A.1
ISSN: 0091-7613
Date Deposited: 16 Dec 2009 15:34
Last Modified: 24 May 2017 07:21

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