Observations of Deformation

Volcano number:373050
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR, GPS - continuous, GPS - campaign, Levelling, Strainmeter, Tiltmeter, EDM
Duration of observation:Continuous
Inferred cause(s) of deformation:Faulting/tectonics, Retreating ice cap (Hooper et al., 2011)
Characteristics of deformation:

Between February 2007 and April 2008, swarms of small, deep-seated earthquakes were detected within the Kverkfjöll volcanic system (Upptyppingar) in north-eastern Iceland (Hooper et al., 2011) associated with a deep dyke intrusion. 
Volcano deformation was measured using InSAR and GPS (both continuous and campaign). Hooper et al. (2011) states that “the continuous GPS station shows a change in velocity towards the end of April 2007, then steady deformation until March 2008 when the velocity reverts again to the background rate”.
The authors also investigate the impact of the ice caps on measured deformationdeformation: “From the horizontal GPS data, we simultaneously estimated the background motion due to plate spreading and the thinning of the ice caps, seasonal motion due to snow loading, and the additional velocity during the intrusion”.
The authors estimate the dyke dimension as: “Strike and dip of the dyke are 81°–82° and 42°–43° respectively and the volume is 42–47millionm3 “.

Reference(s):Smithsonian Institution Global Volcanism Program
Hooper, A, B. Ófeigsson, F. Sigmundsson, B. Lund, H. Geirsson, P. Einarsson and E. Sturkell (2011), Increased capture of magma in the crust promoted by ice-cap retreat in Iceland, Nature Geosci, 4, 783-786, doi:10.1038/NGEO1269.
Location:64.65, -1.72
REST API endpoint (JSON):https://comet.nerc.ac.uk/wp-json/volcanodb/v1/volcano/3050

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