<div dir="ltr"><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Maren Kahl</b> <span dir="ltr"><<a href="mailto:marenk@hi.is">marenk@hi.is</a>></span><br>Date: Fri, Nov 11, 2016 at 10:25 AM<br>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'<br>To: <a href="mailto:jhi@hi.is">jhi@hi.is</a><br><br><br><div lang="EN-US" link="#0563C1" vlink="#954F72"><div class="m_-1478591997242626023WordSection1"><p class="MsoNormal">Dear all,<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">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:<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><b>Magnús Tumi Guðmundsson <i>The caldera collapse of Bárðarbunga in 2014-15 and its link to the Holuhraun eruption</i><u></u><u></u></b></p><p class="MsoNormal"><u></u> <u></u></p><p class="m_-1478591997242626023MsoPlainText">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.<u></u><u></u></p><p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal">Best,<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Maren & Maria<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> </p></div>
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<br></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div>Deirdre Clark, PhD Research Fellow<br></div>University of Iceland | Háskóli Íslands<br></div><div>Institute of Earth Sciences<br></div><div>Sturlugata 7, Askja, Room 235<br></div><div>101 Reykjavík, Iceland<br><br></div><div>+354 525 4275 (Office)<br>+354 690 5745 (Mobile)<br></div><div><a href="mailto:dec2@hi.is" target="_blank">dec2@hi.is</a><br></div></div></div></div></div>
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