Zobrazeno 1 - 10 of 12 pro vyhledávání: '"Geoff Blewitt"'
1
The Viscosity of the Top 700 km of the Lower Mantle estimated using GPS, GRACE, and Relative Sea Level measurements of Glacial Isostatic Adjustment
Autor: Donald Argus, W. Richard Peltier, Geoff Blewitt, Corne Kreemer, Matteo Vacchi
We distinguish between two models of solid Earth's viscous response to unloading of the Laurentide ice sheet over the past 26,000 years. The upper mantle viscosity in both models is 0.5 x 1021 Pa s. The viscosity of the top 700 km of the lower mantle
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9c54eb5bb3884b673c52bf01edbcfd83
https://doi.org/10.5194/gstm2020-33
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2
Land Subsidence in Las Vegas, Nevada, 1935-2000: New Geodetic Data Show Evolution, Revised Spatial Patterns, and Reduced Rates
Autor: John W. Bell, Falk Amelung, Alan R. Ramelli, Geoff Blewitt
Publikováno v: Environmental & Engineering Geoscience. 8:155-174
Subsidence in Las Vegas Valley has been geodetically monitored since 1935, and several generations of maps have depicted more than 1.5 m of total subsidence. This study presents new geodetic data that reveal insights into the spatial distribution and
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::123ee36fba704fdeda0ec5bb9a824775
https://doi.org/10.2113/8.3.155
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3
The terrestrial reference frame and the dynamic Earth
Autor: Zuheir Altamimi, Mike Watkins, Kristine M. Larson, Jim Ray, Patrick Sillard, John C Ries, Martine Feissel, Gérard Petit, John C. Manning, Donald F. Argus, Thomas A. Herring, Ben Chao, Remi Ferland, C. M. Meertens, Detlef Angermann, Bill Holt, Axel Nothnagel, Chopo Ma, Richard J. Eanes, Hermann Drewes, Erricos C. Pavlis, Geoff Blewitt, Jan Johannson, Claude Boucher, Hans-Georg Scherneck
Publikováno v: Eos, Transactions American Geophysical Union. 82:273-279
As early as the 15th century Swedes noticed that rocks in their harbors were slowly rising out of the sea [Ekman, 1991]. These local observations were not sufficient to distinguish whether the rocks were rising or the sea level falling. Later, it was
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::606ac4bf7044de2a795c6f323f2c8eb8
https://doi.org/10.1029/eo082i025p00273-01
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4
Improved GPS solar radiation pressure modeling for precise orbit determination
Autor: Stephen M. Lichten, Michael Heflin, Geoff Blewitt, Yvonne Vigue, Ron Muellerschoen
Publikováno v: Journal of Spacecraft and Rockets. 31:830-833
Data collected from a worldwide 1992 experiment have been processed at the Jet Propulsion Laboratory to determine precise orbits for the satellites of the Global Positioning System (GPS). The goal of this study was to improve satellite force modeling
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f2522f1bad76bcea8aacca938c32e471
https://doi.org/10.2514/3.26519
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6
Global geodesy using GPS without fiducial sites
Autor: Michael Heflin, Ulf J. Lindqwister, Adam P. Freedman, Frank Webb, Yvonne Vigue, James F. Zumberge, Ken Hurst, Geoff Blewitt, T. P. Yunck, Willy Bertiger, S. M. Lichten
Publikováno v: Geophysical Research Letters. 19:131-134
Baseline lengths and geocentric radii have been determined from GPS data without the use of fiducial sites. Data from the first GPS experiment for the IERS and Geodynamics (GIG '91) have been analyzed with a no-fiducial strategy. A baseline length da
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::16c3100eed2be88a2c3d1b7474019d6a
https://doi.org/10.1029/91gl02933
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9
Datum Transformations and Projections
Autor: Geoff Blewitt, George Taylor
Publikováno v: Intelligent Positioning ISBN: 9780470035665
Intelligent Positioning: GIS-GPS Unification
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::55aca7e0fa2363adcc692de585292ecb
https://doi.org/10.1002/0470035668.ch3
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