Lake Bonneville and Estimates of Upper Mantle Viscosity
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Transcript of Lake Bonneville and Estimates of Upper Mantle Viscosity
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Lake Bonneville and Estimates of Upper Mantle Viscosity
Kevin Kwong & Glynis Jehle
Keith Vaught, “Ancient Shoreline” via Flickr, August 28, 2011 , < http://www.flickr.com/photos/hiker56/444876892/>
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Water
Image from GEOCACHING
Passey 1981
Shoreline Measurements Reflecting Isostatic Rebound
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Crittenden 1963
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Elevations of Bonneville and Provo Shorelines
North and South Profile West and East Profile
Passey 1981 Passey 1981
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Calculating Viscosity is the viscosity of the substratum in poises
f represents the dimensions of the load
ρ = 3.4 g cm/3, the density of the substratum
g is the acceleration caused by gravity on earth, 9.8 m/s2
k = 1/Tr , time 0f rebound is 4000 yrs
Solving for viscosity gave a value of 0.96 x 1021 poises, or 1021 poises