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Record Details

Record 79 of 5329
A comparison of eastern North American seismic strain-rates to glacial rebound strain-rates
External Online Source: doi:10.1029/94GL01854
Author and Affiliation:
James, Thomas S.(Geological Survey of Canada, Canada)
Bent, Allison L.(Geological Survey of Canada, Canada)
Abstract: Glacial rebound strain-rates computed using a simple Laurentide glacial loading model are of the order of 10(exp -9) per year within the region of glaciation and extending several hundred kilometers beyond. The horizontal strain-rates receive approximately equal contributions from horizontal and vertical velocities, a consequence of the spherical geometry adopted for the Earth model. In the eastern United States and southeastern Canada the computed strain-rates are 1-3 orders of magnitude greater than an estimate of the average seismic strain-rate (Anderson, 1986) and approximately 1 order of magnitude greater than predicted erosional strain-rates. The predicted glacial rebound strain-rates are not, in general, oriented in such a way as to augment the observed state of deviatoric stress, possibly explaining why the seismic strain-rates are much smaller than the glacial rebound strain-rates. An exception to this may be seismically active regions in the St. Lawrence valley.
Publication Date: Sep 15, 1994
Document ID:
19950047316
(Acquired Dec 28, 1995)
Accession Number: 95A78915
Subject Category: GEOPHYSICS
Document Type: Journal Article
Publication Information: Geophysical Research Letters (ISSN 0094-8276); 21; 19; p. 2127-2130
Publisher Information: United States
Contract/Grant/Task Num: USGS-14-08-0001-G-1957; NAG5-1940
Financial Sponsor: NASA; Canada
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: GLACIERS; NORTH AMERICA; SEISMOLOGY; STRAIN RATE; CRUSTAL FRACTURES; EARTH MANTLE; MATHEMATICAL MODELS; PLATES (TECTONICS)
Imprint And Other Notes: Geophysical Research Letters vol. 21, no. 19 p. 2127-2130 September 15, 1994
Availability Source: Other Sources
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