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Stress barriers controlling lateral migration of magma revealed by seismic tomography
CSIC, Inst Earth Sci Jaume Almera, ICTJA, Barcelona, Spain..
CSIC, Inst Earth Sci Jaume Almera, ICTJA, Barcelona, Spain..
CSIC, Inst Earth Sci Jaume Almera, ICTJA, Barcelona, Spain..
IGN, Observ Geofis Cent, Madrid, Spain..
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2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 40757Article in journal (Refereed) Published
Abstract [en]

Understanding how monogenetic volcanic systems work requires full comprehension of the local and regional stresses that govern magma migration inside them and why/how they seem to change from one eruption to another. During the 2011-2012 El Hierro eruption (Canary Islands) the characteristics of unrest, including a continuous change in the location of seismicity, made the location of the future vent unpredictable, so short term hazard assessment was highly imprecise. A 3D P-wave velocity model is obtained using arrival times of the earthquakes occurred during that pre-eruptive unrest and several latter post-eruptive seismic crises not related to further eruptions. This model reveals the rheological and structural complexity of the interior of El Hierro volcanic island. It shows a number of stress barriers corresponding to regional tectonic structures and blocked pathways from previous eruptions, which controlled ascent and lateral migration of magma and, together with the existence of N-S regional compression, reduced its options to find a suitable path to reach the surface and erupt.

Place, publisher, year, edition, pages
2017. Vol. 7, article id 40757
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-315814DOI: 10.1038/srep40757ISI: 000391927800001OAI: oai:DiVA.org:uu-315814DiVA, id: diva2:1076165
Funder
EU, FP7, Seventh Framework Programme, 282759
Available from: 2017-02-22 Created: 2017-02-22 Last updated: 2017-11-29Bibliographically approved

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