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SUMMARY:Unsteady plumes and explosive volcanism - Matthew Scase\, Universi
 ty of Nottingham
DTSTART:20110527T150000Z
DTEND:20110527T160000Z
UID:TALK31108@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:Vulcanian eruptions are a common\, and extremely hazardous\, f
 orm of volcanic activity that produce plumes of hot volcanic gas and ash. 
 Such eruptions can produce significant eruption volumes\, as recent VEI3 e
 ruptions at Montserrat and Sakurajima demonstrate. The vent conditions are
  not well described by approximation to either steady or instantaneous sou
 rces. The eruptions are of short duration\, typically seconds—mintues\, 
 and are characterized by unsteady source conditions.\n\nThe classical stea
 dy state “plume equations” due to Morton\, Taylor &\nTurner are develo
 ped to allow for use in unsteady multiphase flow\, including Vulcanian eru
 ptions. New measurement techniques allow field observations from Santiagui
 to Volcano\, Guatemala to be used as input boundary conditions to the deve
 loped model enabling comparison with plume rise-height observations. Large
  errors in eruption parameters are shown to occur if steady models are inc
 orrectly used to invert\, for example\, deposit measurements to\ninfer sou
 rce conditions for historic or unobserved eruptions.
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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