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Title

Stress barriers controlling lateral migration of magma revealed by seismic tomography

AuthorsMartí Molist, Joan ; Villaseñor, Antonio ; Geyer, Adelina ; López, Carmen ; Tryggvason, A.
KeywordsCanary Islands
comprehension
compression
earthquake
hazard assessment
human
human experiment
model
P wave
stress
tomography
velocity
Issue Date2017
PublisherNature Publishing Group
CitationScientific Reports, 7: 40757 (2017)
AbstractUnderstanding 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. © The Author(s) 2017.
Publisher version (URL)http://dx.doi.org/10.1038/srep40757
URIhttp://hdl.handle.net/10261/143045
DOI10.1038/srep40757
ISSN2045-2322
E-ISSN2045-2322
Appears in Collections:(ICTJA) Artículos
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