Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.351...53s&link_type=abstract
Nature (ISSN 0028-0836), vol. 351, May 2, 1991, p. 53-55. Research supported by ASI and NASA.
Physics
25
Earth Mantle, Earthquakes, Seismology, Viscosity, Convection, Glaciers, Ice Environments, Lithosphere
Scientific paper
It is shown here that seismicity around the margins of deglaciated areas provides a constraint on the viscosity of the lower mantle. Calculations using a spherical, viscoelastic earth model show that the present-day magnitude of the stress fields induced in the lithosphere beneath the Laurentide and Fennoscandian ice sheets is very sensitive to the value of the lower-mantle viscosity. Stress of about 100 bar, sufficient to cause seismicity, can still remain in the lithosphere for lower-mantle viscosities greater than about 10 to the 22nd Pa-s; for lower-mantle viscosities of about 10 to the 21st Pa-s, only a few tens of bars of stress persist in the lithosphere today. This influence of lower-mantle viscosity on the state of stress in the lithosphere also has implications for the migration of stress from earthquakes, and hence for earthquake recurrence times.
Boschi Elisa
Sabadini Roberto
Spada Giorgio
Yuen Dave A.
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