Geophysics, Lecture Notes- Physics - Prof Gavin Bell 5

Geophysics, Lecture Notes- Physics - Prof Gavin Bell 5 -...

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PX266 Geophysics (2010/11) Lecture 8 Handout – Isostasy Dr. Gavin Bell Isostatic compensation: Airy model
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Hudson Bay area – rate of change of geoid height measured by GRACE Image taken from Tamisiea et al. , Science 316, p. 881 (2007). The paper models the observed gravity patterns using both post-glacial uplift (relatively rapid, starting at the end of the last Ice Age) and slower upper mantle convection processes. The viscosity of the upper mantle comes out at between 8×10 20 and 3×10 21 Pa s. Notes Also a possible meteorite impact site? (geological features on bay’s east coast) Hudson Bay may be source of oldest rock (“protocrust”) ever found on Earth (4.3 billion years by Sm-Nd) – reported in Science 321 (September 2008). Further study Q. 10 on isostatic compensation and gravity anomalies. Q. 11 on a simple isostasy model for glacial depression of the lithosphere. Q. 12 researching a little bit about the post-glacial uplift of Sweden and Finland and using its time dependence to estimate the viscosity of the asthenosphere. You should
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