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  • 1
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    Measurement of horizontal motions in Alaska using very long baseline interferometry (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Results are presented on an analysis of VLBI measurements performed between 1984 and 1990 by means of a network of 53 sites in Alaska, the Yukon Territory, and the conterminous United States to determine the extent of horizontal motions in Alaska. Results are presented in two ways, one showing the evolution of individual baselines and the other yielding site velocities; both approaches use VLBI data from other permanent stations in order to define a global reference frame. It was found that VLBI sites within the Alaska-Aleutian subduction boundary zone (Yakataga, Kodiak, and Sand Point) had higher instantaneous velocities relative to eastern North America than the interior sites of Alaska. The results of Yakataga data modeling suggests that the observed motion is the result of elastic straining of the overriding plate due to a locked main thrust zone with a component of oblique slip.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 21991-22
    Format: text
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  • 2
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    Geodetic measurement of deformation in the Loma Prieta, California earthquake with very long baseline interferometry (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: VLBI measurements were conducted immediately after the Loma Prieta earthquake and compared with VLBI gathered at Monterey, San Francisco, and Point Reyes since 1983 to obtain preearthquake deformation rates with respect to a North American reference frame. The estimated displacements at Monterey and San Francisco are consistent with the static displacements predicted on the basis of a coseismic slip model in which slip on the southern segment is shallower than slip on the northern segment of the fault rupture. Cartesian positions are presented at epoch 1990.0 of a set of VLBI fiducial stations and the three mobile sites in the earthquake's vicinity.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 17; 1215-121
    Format: text
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  • 3
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    Comparison of VLBI and SLR geocentric site coordinates (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Results are reported from a systematic comparison of the geocentric coordinates determined for 18 pairs of VLBI and satellite laser ranging (SLR) sites. The data and results are presented in tables and briefly characterized. The rms differences in the X, Y, and Z coordinates are found, after a 7-parameter frame adjustment, to be 15, 22, and 22 mm, respectively. The potential usefulness of a combined VLBI-SLR reference frame for spacecraft tracking and similar applications is indicated.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 18; 231-234
    Format: text
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  • 4
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    Crustal Dynamics Project data analysis, 1990 (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Goddard Very Long Baseline Interferometry (VLBI) group reports the results of analyzing 1073 Mark 3 data sets acquired from fixed and mobile observing sites through the end of 1989 and available to the Crustal Dynamics Project. Two large solutions, GLB656 and GLB657, were used to establish a VLBI reference frame with an origin coincident with the ITRF89. Another large solution, GLB658, was used to obtain Earth rotation parameters, nutation offsets, and global source positions. Site velocities were obtained from another large solution, GLB659. A fifth large solution, GLB660, was used to obtain baseline evolution. Site positions are tabulated on a yearly basis from 1979 through 1992. Site velocities are presented in both Cartesian and topocentric coordinates. The results include 76 sources, 80 sites, and 422 baselines.
    Keywords: GEOPHYSICS
    Type: NASA-TM-100765 , REPT-91E00714 , NAS 1.15:100765
    Format: application/pdf
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  • 5
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    Crustal dynamics project data analysis, 1991: VLBI geodetic results, 1979 - 1990 (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Goddard VLBI group reports the results of analyzing 1412 Mark II data sets acquired from fixed and mobile observing sites through the end of 1990 and available to the Crustal Dynamics Project. Three large solutions were used to obtain Earth rotation parameters, nutation offsets, global source positions, site velocities, and baseline evolution. Site positions are tabulated on a yearly basis from 1979 through 1992. Site velocities are presented in both geocentric Cartesian coordinates and topocentric coordinates. Baseline evolution is plotted for 175 baselines. Rates are computed for earth rotation and nutation parameters. Included are 104 sources, 88 fixed stations and mobile sites, and 688 baselines.
    Keywords: GEOPHYSICS
    Type: NASA-TM-104552 , REPT-92B00070 , NAS 1.15:104552
    Format: application/pdf
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  • 6
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    Crustal dynamics project data analysis, 1986. Volume 1: Fixed station VLBI geodetic results (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Goddard VLBI group reports the results of analyzing 361 Mark III VLBI data sets from fixed observatories through the end of 1985 which are available to the Crustal Dynamics Project. All POLARIS/IRIS full-day data sets are included. The mobile VLBI sites at Platteville, Colorado; Penticton, British Columbia; and Yellowknife, Northwest Territories are also included since these occupations bear on the study of plate stability. Two large solutions, GLB027 and GLB028, were used to obtain site/baseline evolutions and earth rotation parameters, respectively. Source positions and nutation offsets were also adjusted in each solution. The results include 23 sites and 101 baselines.
    Keywords: GEOPHYSICS
    Type: NASA-TM-87806 , REPT-87B0118 , NAS 1.15:87806
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  • 7
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    NASA Space Geodesy Program: GSFC data analysis, 1992. Crustal Dynamics Project VLBI geodetic results, 1979 - 1991 (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Goddard VLBI group reports the results of analyzing 1648 Mark 3 data sets acquired from fixed and mobile observing sites through the end of 1991, and available to the Crustal Dynamics Project. Two large solutions were used to obtain Earth rotation parameters, nutation offsets, radio source positions, site positions, site velocities, and baseline evolution. Site positions are tabulated on a yearly basis for 1979 to 1995, inclusive. Site velocities are presented in both geocentric Cartesian and topocentric coordinates. Baseline evolution is plotted for 200 baselines, and individual length determinations are presented for an additional 356 baselines. This report includes 155 quasar radio sources, 96 fixed stations and mobile sites, and 556 baselines.
    Keywords: GEOPHYSICS
    Type: NASA-TM-104572 , REPT-93B00055 , NAS 1.15:104572
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  • 8
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    Geodesy by radio interferometry - Intercontinental distance determinations with subdecimeter precision (1981)
    In:  Other Sources
    Details
    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
    Format: text
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  • 9
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    Crustal dynamics project data analysis fixed station VLBI geodetic results (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Goddard VLBI group reports the results of analyzing the fixed observatory VLBI data available to the Crustal Dynamics Project through the end of 1984. All POLARIS/IRIS full-day data are included. The mobile site at Platteville, Colorado is also included since its occupation bears on the study of plate stability. Data from 1980 through 1984 were used to obtain the catalog of site and radio source positions labeled S284C. Using this catalog two types of one-day solutions were made: (1) to estimate site and baseline motions; and (2) to estimate Earth rotation parameters. A priori Earth rotation parameters were interpolated to the epoch of each observation from BIH Circular D.
    Keywords: GEOPHYSICS
    Type: NASA-TM-86229 , REPT-85B0522 , NAS 1.15:86229
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  • 10
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    Crustal dynamics project data analysis, 1988: VLBI geodetic results, 1979 - 1987 (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results obtained by the Goddard VLBI (very long base interferometry) Data Analysis Team from the analysis of 712 Mark 3 VLBI geodetic data sets acquired from fixed and mobile observing sites through the end of 1987 are reported. A large solution, GLB401, was used to obtain earth rotation parameters and site velocities. A second large solution, GLB405, was used to obtain baseline evolutions. Radio source positions were estimated globally while nutation offsets were estimated from each data set. Site positions are tabulated on a yearly basis from 1979 through 1988. The results include 55 sites and 270 baselines.
    Keywords: GEOPHYSICS
    Type: NASA-TM-100723 , REPT-89B00094 , NAS 1.15:100723
    Format: application/pdf
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