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Volcanic plume height correlated with magma-pressure change at Grimsvotn Volcano, Iceland

Artikel i vetenskaplig tidskrift
Författare S. Hreinsdottir
F. Sigmundsson
M. J. Roberts
H. Bjornsson
R. Grapenthin
P. Arason
T. Arnadottir
J. Holmjarn
H. Geirsson
R. A. Bennett
M. T. Gudmundsson
B. Oddsson
B. G. Ofeigsson
T. Villemin
T. Jonsson
Erik Sturkell
A. Hoskuldsson
G. Larsen
T. Thordarson
B. A. Oladottir
Publicerad i Nature Geoscience
Volym 7
Nummer/häfte 3
Sidor 214-218
ISSN 1752-0894
Publiceringsår 2014
Publicerad vid Institutionen för geovetenskaper
Sidor 214-218
Språk en
Länkar dx.doi.org/10.1038/ngeo2044
Ämnesord ERUPTION, DEFORMATION
Ämneskategorier Geovetenskap och miljövetenskap

Sammanfattning

Magma flow during volcanic eruptions causes surface deformation that can be used to constrain the location, geometry and internal pressure evolution of the underlying magmatic source(1). The height of the volcanic plumes during explosive eruptions also varies with magma flow rate, in a nonlinear way(2,3). In May 2011, an explosive eruption at Grimsvotn Volcano, Iceland, erupted about 0.27 km(3) dense-rock equivalent of basaltic magma in an eruption plume that was about 20 km high. Here we use Global Positioning System (GPS) and tilt data, measured before and during the eruption at Grimsvotn Volcano, to show that the rate of pressure change in an underlying magma chamber correlates with the height of the volcanic plume over the course of the eruption. We interpret ground deformation of the volcano, measured by geodesy, to result from a pressure drop within a magma chamber at about 1.7 km depth. We estimate the rate of magma discharge and the associated evolution of the plume height by differentiating the co-eruptive pressure drop with time. The time from the initiation of the pressure drop to the onset of the eruption was about 60 min, with about 25% of the total pressure change preceding the eruption. Near-real-time geodetic observations can thus be useful for both timely eruption warnings and for constraining the evolution of volcanic plumes.

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