Glacial isostasy and plate motion |
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| Affiliation: | 1. GeoForschungsZentrum Potsdam, Geodesy and Remote Sensing, Potsdam, Germany;2. Charles University in Prague, Prague, Czech Republic;3. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA;1. Istituto per le Applicazioni del Calcolo ‘M. Picone’ (C.N.R.), Via dei Taurini, 19, 00186 Rome, Italy;2. Centro Italiano Ricerche Aerospaziali, Via Maiorise, 81043 Capua, Caserta, Italy;3. Dept. Matematica Aplicada, ETSI Telecomunicacion, Universidad Politecnica de Madrid, Avenida Complutense n° 30, “Ciudad Universitaria”, 28040 Madrid, Spain;4. Institute of Geophysics, Polish Academy of Sciences, ul. Księcia Janusza 64, 01-452 Warsaw, Poland;1. Institute of Geoscience, Kiel University, Kiel, Germany;2. Center for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo, Norway;1. Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan;2. Research Center for Prediction of Earthquakes and Volcanic Eruptions, Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan;3. Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Dr, Fairbanks, AK 99775, United States;4. GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany;1. Lamont-Doherty Earth Observatory, Columbia University, New York, USA;2. Dept of Earth Science and Swire Institute of Marine Science, University of Hong Kong, Hong Kong;3. Department of Geology, College of William and Mary, Virginia, USA;4. School of Earth and Ocean Sciences, University of Victoria, Victoria, Canada;5. Department of Earth and Planetary Sciences and Rutgers Institute of Earth, Ocean, and Atmospheric Sciences, Rutgers University, New Jersey, USA |
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| Abstract: | The influence of glacial-isostatic adjustment (GIA) on the motion of tectonic plates is usually neglected. Employing a recently developed numerical approach, we examine the effect of glacial loading on the motion of the Earth’s tectonic plates where we consider an elastic lithosphere of laterally variable strength and the plates losely connected by low viscous zones. The aim of this paper is to elucidate the physical processes which control the GIA-induced horizontal motion and to assess the impact of finite plate-boundary zones. We show that the present-day motion of tectonic plates induced by GIA is at, or above, the order of accuracy of the plate motions determined by very precise GPS observations. Therefore, its contribution should be considered when interpreting the mechanism controlling plate motion. |
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