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SUMMARY:The Physics of Volcanic Eruptions - Professor Herbert Huppert
DTSTART:20070314T200000Z
DTEND:20070314T210000Z
UID:TALK6839@talks.cam.ac.uk
CONTACT:Hamish Gordon
DESCRIPTION:Volcanic eruptions play an important role in the gradual evolu
 tion of the Earth's surface. Large-scale circulation patterns within the E
 arth lead to production of melt that rises into large magma chambers which
  act as the power source for any subsequent eruption.  Within these chambe
 rs different physical processes occur\, including: solidification of melt\
 ;  melting of containing boundaries\; and exsolution of dissolved volatile
 s as the pressure changes.  Each of these phenomena will be described\, al
 ong with a model of the eruptive dynamics using concepts from nonlinear bi
 furcation theory.  Once in the atmosphere\, the subsequent eruptive plume 
 can rise as high as 45km before intruding laterally as a gravity current. 
  Alternatively\, a hot\, ground-hugging pyroclastic flow can result which 
 destroys all in its path before possibly rising into the atmosphere.  The 
 final part of the talk will consider the runout of granular material\, as 
 exemplified by rock avalanches and dome collapses from volcanoes.  The tal
 k will be illustrated by some simple desktop experiments along with colour
  slides and movie sequences of real volcanic events and laboratory simulat
 ions. 
LOCATION:Pharmacology Lecture Theatre
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