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Lookup NU author(s): Professor Geoffrey Blewitt, Dr David Lavallee, Professor Peter ClarkeORCiD
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We have detected a global mode of Earth deformation that is predicted by theory. Precise positioning of Global Positioning System sites distributed worldwide reveals that during February to March, the Northern Hemisphere compresses (and the Southern Hemisphere expands), such that sites near the North Pole move downward by 3.0 millimeters, and sites near the equator are putted northward by 1.5 millimeters. The opposite pattern of deformation occurs during August to September. We identify this pattern as the degree-one spherical, harmonic response of an elastic Earth to increased winter loading of soil moisture, snow cover, and atmosphere. Data inversion shows the load moment's trajectory as a great circle traversing the continents, peaking at 6.9 x 10(22) kilogram meters near the North Pole in winter, indicating interhemispheric mass exchange of 1.0 x 10(16) +/- 0.2 x 10(16) kilograms.
Author(s): Blewitt G, Lavallée DA, Clarke PJ, Nurutdinov K
Publication type: Article
Publication status: Published
Journal: Science
Year: 2001
Volume: 294
Issue: 5550
Pages: 2342-2345
ISSN (print): 0036-8075
ISSN (electronic): 1095-9203
Publisher: American Association for the Advancement of Science
URL: http://dx.doi.org/10.1126/science.1065328
DOI: 10.1126/science.1065328
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