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SUMMARY:The Bardarbunga volcanic system\, Iceland\, and its 2014-2015 dyki
 ng event\, major eruption\, and slow caldera collapse - Freysteinn Sigmund
 sson\, Nordic Volcanological Center\, Institute of Earth Sciences\, Univer
 sity of Iceland
DTSTART:20170117T120000Z
DTEND:20170117T130000Z
UID:TALK70133@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:What is the link between caldera collapses and large volume la
 va eruptions? The first detailed observations of such coupled activity are
  from the 2014-2015 volcano-tectonic episode in the Bardarbunga volcanic s
 ystem in Iceland\, which occurred during the European FUTUREVOLC volcano s
 upersite project. Bardarbunga is a subglacial basaltic caldera volcano und
 er the Vatnajökull ice cap above the center of the Icelandic hotspot\, wi
 th an associated 150-km long fissure swarm. A major lava eruption occurred
  in the Holuhraun plain north of Vatnajökull (about 1.5 km3) and a gradua
 l caldera collapse of the ice covered Bárðarbunga caldera (about 65 m)\,
  connected by a 50 km long dyke (about 0.5 km3) that formed mostly over 2-
 4 weeks after the onset of activity on 16 August 2014. Interaction between
  the pressure exerted by the subsiding reservoir roof and the physical pro
 perties of the subsurface flow path explain observed gradual\, near-expone
 ntial decline of both collapse rate and the intensity of the 180-day-long 
 eruption.\n\nSigmundsson\, F.\, Hooper\, A. Hreinsdottir\, S.\, Vogfjord\,
  K.S.\,  Ofeigsson\, B.G.\, Heimisson\, E.R.\, Dumont\, S.\, Parks\, M.\, 
 Spaans\, K.\, Gudmundsson\, G.B.\, Drouin\, V.\, + 26 others (2015)\, Segm
 ented lateral dyke growth in a rifting event at Bardarbunga volcanic syste
 m\, Iceland\, Nature\, 517(7533)\, 191–195\, doi:10.1038/nature14111.

 \n\nGudmundsson\, M.T.\, Jónsdóttir\, K.\, Hooper\, A.\, Holohan\, E. P.
 \, Halldórsson\, S.A.\, Ófeigsson\, B.G.\, Cesca\, S.\,Vogfjörd\, K.S\,
  Sigmundsson\, F.\, Högnadóttir\, Th.\, Einarsson\, P. + 37 others (2016
 )\, Gradual caldera collapse at Bárdarbunga volcano\, Iceland\, regulated
  by lateral magma outflow\, Science\, 15 July 2016\, vol. 353\, issue 6296
 \, aaf8988. DOI: 10.1126/science.aaf8988.
LOCATION:Tilley Lecture Theatre\, Department of Earth Sciences
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