Repeated magmatic intrusions at El Hierro Island following the 2011–2012 submarine eruption

Maria A. Benito-Saz*, Michelle M. Parks, Freysteinn Sigmundsson, Andrew Hooper, Laura García-Cañada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

After more than 200 years of quiescence, in July 2011 an intense seismic swarm was detected beneath the center of El Hierro Island (Canary Islands), culminating on 10 October 2011 in a submarine eruption, 2 km off the southern coast. Although the eruption officially ended on 5 March 2012, magmatic activity continued in the area. From June 2012 to March 2014, six earthquake swarms, indicative of magmatic intrusions, were detected underneath the island. We have studied these post-eruption intrusive events using GPS and InSAR techniques to characterize the ground surface deformation produced by each of these intrusions, and to determine the optimal source parameters (geometry, location, depth, volume change). Source inversions provide insight into the depth of the intrusions (~ 11–16 km) and the volume change associated with each of them (between 0.02 and 0.13 km3). During this period, > 20 cm of uplift was detected in the central-western part of the island, corresponding to approximately 0.32–0.38 km3 of magma intruded beneath the volcano. We suggest that these intrusions result from deep magma migrating from the mantle, trapped at the mantle/lower crust discontinuity in the form of sill-like bodies. This study, using joint inversion of GPS and InSAR data in a post-eruption period, provides important insight into the characteristics of the magmatic plumbing system of El Hierro, an oceanic intraplate volcanic island.

Original languageEnglish
Pages (from-to)79-91
Number of pages13
JournalJournal of Volcanology and Geothermal Research
Volume344
DOIs
Publication statusPublished - 15 Sept 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

Other keywords

  • Canary Islands
  • El Hierro
  • InSAR/GPS joint inversion
  • Volcano deformation

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