Ambient noise tomography of Eyjafjallajokull volcano, Iceland

Benediktsdottir, AsdisUniv Iceland, Inst Earth Sci, Nord Volcanol Ctr, Sturlugata 7, IS-101 Reykjavik, Iceland.;Univ Iceland, Dept Earth Sci, Sturlugata 7, IS-101 Reykjavik, Iceland. (author)

We present a shear-velocity model for the Eyjafjallajokull stratovolcano, based on ambient seismic noise tomography applied to seven months of data from six permanent stations and -10 temporary seismic stations, deployed during and after the 2010 volcanic unrest. Vertical components of noise were cross correlated resulting in 30 robust phase-velocity dispersion curves between 1.6 and 6.5 s in period, displaying a +/- 20% variation in phase velocity beneath the volcano. The uneven distribution of noise sources, evaluated using signal-to-noise ratios, was estimated to cause less than 2% error in most curves. Sensitivity kernels showed resolution down to 10 km and the lateral resolution of the resulting phase-velocity maps was about 5 km. The model reveals east-west oriented high-velocity anomalies due east and west of the caldera. Between these a zone of lower velocity is identified, coinciding with the location of earthquakes that occurred during the summit eruption in April 2010. A shallow, southwest elongated low-velocity anomaly is located 5 km southwest of the caldera. The limited depth resolution of the shear-velocity model precludes detection of melt within the volcano.

Gudmundsson, ÓlafurUppsala universitet,Geofysik(Swepub:uu)olagu373 (author)
Brandsdottir, BryndisUniv Iceland, Sci Inst, Inst Earth Sci, Reykjavik, Iceland. (author)
Tryggvason, Ari,1967-Uppsala universitet,Geofysik(Swepub:uu)aretrygg (author)
Univ Iceland, Inst Earth Sci, Nord Volcanol Ctr, Sturlugata 7, IS-101 Reykjavik, Iceland.;Univ Iceland, Dept Earth Sci, Sturlugata 7, IS-101 Reykjavik, Iceland.Geofysik (creator_code:org_t)

In:Journal of Volcanology and Geothermal Research: Elsevier BV347, s. 250-2630377-02731872-6097

By the author/editor: Benediktsdottir, ...; Gudmundsson, Óla ...; Brandsdottir, Br ...; Tryggvason, Ari, ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geophysics

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