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  • 1
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    Application of VLBI and satellite laser ranging to geodynamics (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The NASA Crustal Dynamics Project has developed very-long baseline interferometer (VLBI) systems and satellite laser ranging (SLR) systems for geodynamics measurements. In VLBI, a radio noise signal from a distant quasar is received by two or more radio antennas and coherently recorded. These recordings are cross-correlated to determine the relative signal delays between stations which are used to derive the vector baselines between the stations. The SLR systems accurately determine the range to a retroreflector satellite as a function of time with short laser pulses. These range measurements from several stations to the same satellite are used in orbit analysis programs to determine the position of the stations and the vector baselines between the stations. Measurements with these systems have achieved precisions of a few centimeters in length for distances of several thousand km. These systems are now operating in a global network for measuring the relative motion of the N. American, Pacific, S. American, Nazca, Eurasian and Australian tectonic plates. Highly mobile VLBI and SLR systems are being operated at many sites in the active earthquake areas in western N. America in order to determine the crustal deformation and strain accumulation.
    Keywords: GEOPHYSICS
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  • 2
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    Constraints on future observing plans (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Scheduling considerations in the deployment of transportable laser ranging systems (TLRS) in 1985 are discussed. The new TLRS units will be field tested in North America and Europe first before being sent to remote Mediterranean and South American sites. Six weeks' residence will be required for 600 hr of measurements at each site, although a second crew could bring the necessary time down to four weeks. The surveys are set for periods of the year with the greatest incidence of clear skies. Twelve sites have been selected in the Mediterranean area, although no weather data have been acquired. Site selections are constrained by the need for accessible roads, telephones, and the stability of the terrain. Details of the marker monument layouts are provided.
    Keywords: GEOPHYSICS
    Type: Annales Geophysicae (ISSN 0755-0685); 2; 261-263
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  • 3
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    Crustal Dynamics Project - Status and plans (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The progress of the NASA Crustal Dynamics Project is summarized. The Project is performed to measure regional deformation and strain accumulation due to large earthquakes in the plate boundary region of western N. America, to measure relative plate motions around the globe, to measure internal deformations of continental and oceanic lithospheric plates, to relate the rotational dynamics of the earth to earthquakes, plate motions and other geophysical phenomena and to measure regional fault motions and strain accumulation globally. VLBI and satellite laser ranging (SLR) have been employed using several base and mobile stations in N. America, Europe, S. America and the S. Pacific. Satellite data are being gathered with the LAGEOS spacecraft. Measurement campaigns in S. America and the Carribbean and Mediterranean regions will be carried out with new instrumentation in 1985.
    Keywords: GEOPHYSICS
    Type: Annales Geophysicae (ISSN 0755-0685); 2; 225
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  • 4
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    Space-age geodesy - The NASA Crustal Dynamics Project (1985)
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    Publication Date: 2011-08-19
    Description: The NASA Crustal Dynamics Project (CDP) has deployed satellite laser ranging (SLR) systems and VLBI techniques for measurements of global and regional crustal motions and earth rotation parameters. The measurement programs for the years 1984 and 1983 are described, and some preliminary results are presented. A complete list of the fixed receiving stations in the CDP network is given.
    Keywords: GEOPHYSICS
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-23; 360-368
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  • 5
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    Geodesy by radio interferometry - Intercontinental distance determinations with subdecimeter precision (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Analysis of very-long-baseline interferometer (VLBI) observations yielded estimates of the distances between three radio telescopes in the United States and one in Sweden, with formal standard errors of a few centimeters: Westford, Massachusetts-Onsala, Sweden: 5,599,714.66 + or - 0.03 m; Green Bank, West Virginia-Onsala, Sweden: 6,319,317.75 + or - 0.03 m; and Owens Valley, California-Onsala, Sweden: 7,914,131.19 + or - 0.04 m, where the earth-fixed reference points are defined in each case with respect to the axes of the telescopes. The actual standard errors are difficult to estimate reliably but are probably not greater than twice the formal errors.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; Mar. 10
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  • 6
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    Geodesy by radio interferometry - Determinations of baseline vector, earth rotation, and solid earth tide parameters with the Mark I very long baseline radio interferometery system (1986)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Thirty-seven very long baseline radio interferometry experiments performed between 1972 and 1978 are analyzed and estimates of baseline vectors between six sites, five in the continental United States and one in Europe are derived. No evidence of significant changes in baseline length is found. For example, with a statistical level of confidence of approximately 85 percent, upper bounds on such changes within the United States ranged from a low of 10 mm/yr for the 850 km baseline between Westford, Massachusetts, and Green Bank, West Virginia, to a high of 90 mm/yr for the nearly 4000 km baseline between Westford and Goldstone, California. Estimates for universal time and for the x component of the position of the earth's pole are obtained. For the last 15 experiments, the only ones employing wideband receivers, the root-mean-square differences between the derived values and the corresponding ones published by the Bureau International de l'Heure are 0.0012 s and 0.018 arc sec respectively. The average value obtained for the radial Love number for the solid earth is 0.62 + or - 0.02 (estimated standard error).
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; 1935-194
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