[Folda] Fwd: [Jhi] Friday seminar - today, 12.30 - Magnús Tumi Guðmundsson 'The caldera collapse of Bárðarbunga in 2014-15 and its link to the Holuhraun eruption'

[Deirdre Clark]

---------- Forwarded message ----------
From: Maren Kahl <marenk at hi.is>
Date: Fri, Nov 11, 2016 at 10:25 AM
Subject: [Jhi] Friday seminar - today, 12.30 - Magnús Tumi Guðmundsson 'The
caldera collapse of Bárðarbunga in 2014-15 and its link to the Holuhraun
eruption'
To: jhi at hi.is


Dear all,



this is a quick reminder that the seminar series will continue today at
12:30 in the seminar room on the 3rd floor with a presentation given by:



*Magnús Tumi Guðmundsson The caldera collapse of Bárðarbunga in 2014-15 and
its link to the Holuhraun eruption*



During the Bárðarbunga-Holuhraun rifting event in 2014-2015 the
simultaneous occurrence of caldera collapse and a large flood basalt
fissure eruption was observed for the first time with modern technology.
Events of this type are not common, as globally only a few caldera
collapses occur per century.  Hence, the lack of detailed observations of
caldera formation has obscured insight into the mechanical interplay
between collapse and eruption. In order to address this, for Bárðarbunga
2014-2015 an effort was made to use a large array of geophysical and
geochemical data for multiparametric analysis.  The results presented are
based on this analysis, the efforts of the 48 members of the Bárðabunga
collapse team.  The results show that the 110-square-kilometer and
65-meter-deep collapse was initiated through withdrawal of magma, and
lateral migration through a 48-kilometers-long dike, from 12-kilometers
deep reservoir. After onset of collapse, interaction between the pressure
exerted by the subsiding magma reservoir roof and the physical properties
of the subsurface magma flow path explain the gradual, near-exponential
decline of both collapse rate and the intensity of the 180-day- long
eruption.  Thus event also throws new light on how the largest eruptions in
Iceland may be linked to caldera collapses.





Best,



Maren & Maria







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-- 
Deirdre Clark, PhD Research Fellow
University of Iceland | Háskóli Íslands
Institute of Earth Sciences
Sturlugata 7, Askja, Room 235
101 Reykjavík, Iceland

+354 525 4275 (Office)
+354 690 5745 (Mobile)
dec2 at hi.is
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