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SUMMARY:Variability in melt extrusion at silicic volcanoes - Chloe Michaut
  (Institut de Physique du Globe de Paris\; Université Paris 7 - Denis-Did
 erot)
DTSTART:20160607T130000Z
DTEND:20160607T134500Z
UID:TALK66375@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Since the 80&rsquo\;s\, the monitoring of silicic volcanoes us
 ing geophysical techniques has largely been developed around the world. Th
 is has allowed important advances on our understanding of magmatic and vol
 canic processes.  <br>First\, the concept of magma chamber has radically c
 hanged. Indeed\, geophysical surveys do not find large liquid magma bodies
  below active volcanoes\, but only large\, diffuse\, partial melt zones. M
 agma chambers are now described as large mush zones located at different l
 evels in the crust and constructed by accumulation of small magma batches 
 over hundreds of millions of years. The two-phase dynamics of a crystal an
 d magma mixture thus controls melt extraction during periods of unrest.  <
 br>Second\, the activity of silicic volcanoes has appeared cyclic and mark
 ed by different periods of cyclicity going from tens of years to the secon
 d. Some of them are clearly linked to the very different physical properti
 es and behaviors of the different phases present in magmatic systems: crys
 tal\, melt and gas.  <br>In the end\, at arc-volcanoes\, melts extracted f
 rom the mantle face a complex and vertically stratified filter: the crust.
  Understanding the dynamics of a three-phase mixture in a vertically strat
 ified environment is thus crucial for the assessment of eruptive risk\, in
  particular to describe the transfer function characteristic of this crust
 al filter.      <br>
LOCATION:Seminar Room 1\, Newton Institute
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