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VERSION:2.0
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CALSCALE:GREGORIAN
X-WR-CALNAME:Geophysics PhD Defense\, Laura Blackstone: "How magma moves: P
 hysics-based models with applications to lava fountains\, dikes\, and magm
 a mushes"
X-WR-TIMEZONE:Pacific Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260715T220615Z
UID:tag:localist.com\,2008:EventInstance_52074320489512
DTSTART:20260224T170000Z
DTEND:20260224T180000Z
DESCRIPTION:Abstract: \n\nIn the field of volcanology\, one significant hur
 dle to understanding volcanic systems is that we are limited to observatio
 ns made at the literal surface level during a blink of geologic time\, in 
 order to interrogate processes that stretch deep into the earth and into t
 he past. Despite relatively few opportunities to directly observe eruption
 s\, we want to answer questions such as\, "How much magma is there? Where 
 will magma reach the surface? When will the next eruption be?” To comple
 ment direct observations\, volcanologists model volcanic processes using k
 nown physics\, in order to make predictions about the architecture and beh
 avior of real volcanoes. However\, model-based predictions are limited by 
 the assumptions used to construct them. My dissertation seeks to use physi
 cs-based models of magma on the move to better constrain real-world magma 
 systems. \n\n \n\nIn the first chapter\, I model magma traveling through a
  conduit and erupting as a lava fountain. I use lava fountain heights obse
 rved at Sierra Negra Volcano\, Galapagos\, to constrain H2O and CO2 conten
 t\, which in turn better constrains the total volume of magma within the s
 hallow chamber at Sierra Negra in concert with more conventional predictio
 n methods\, which assume gasless basalt in the chamber. In the second chap
 ter\, I challenge the assumption that magma pressure within a dike (a magm
 a-filled crack) has an insignificant effect on the direction in which the 
 dike will propagate. I use a finite element model\, which fully couples ma
 gma in a reservoir and dike to a hydraulically-fracturing elastic host roc
 k\, to quantify the extent to which the dike influences its own path. In t
 he third chapter\, I study how melt moves through a vertically extensive m
 ush (crystal matrix with interstitial melt) to recharge shallow reservoirs
  with application to Axial Seamount\, an underwater volcano. I investigate
  the extent to which depth-variable permeability within the mush is capabl
 e of predicting observed inter-eruption uplift at Axial and compare with e
 xisting\, mush-less interpretations of the system. Taken together\, my wor
 k uses physics-based models of magma in motion to reinterpret existing pre
 dictions made by conventional models\, through challenging conventional as
 sumptions.
GEO:37.426402;-122.172635
LOCATION:Mitchell Earth Sciences\, Hartley Conference Center
SUMMARY:Geophysics PhD Defense\, Laura Blackstone: "How magma moves: Physic
 s-based models with applications to lava fountains\, dikes\, and magma mus
 hes"
URL;VALUE=URI:https://events.stanford.edu/event/geophysics-phd-defense-laur
 a-blackstone-how-magma-moves-physics-based-models-with-applications-to-lav
 a-fountains-dikes-and-magma-mushes
CATEGORIES:PhD Defense
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