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  • Other Sources  (49)
  • METEOROLOGY AND CLIMATOLOGY  (25)
  • EARTH RESOURCES AND REMOTE SENSING  (13)
  • Seismology  (5)
  • Astrophysics  (3)
  • Propellants and Fuels
  • 2000-2004  (10)
  • 1980-1984  (39)
Collection
  • Other Sources  (49)
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Keywords
Years
Year
  • 1
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    A re-assessment of focal depth distributions in southern Iran, the Tien Shan and northern India: do earthquakes really occur in the continental mantle? (2000)
    In:  Geophys. J. Int., San Francisco, Pergamon, vol. 143, no. 3, pp. 629-661, pp. L15303, (ISSN: 1340-4202)
    Details
    Publication Date: 2000
    Keywords: Hypocentral depth ; CRUST ; earth mantle ; Seismology ; Rheology ; Lithosphere ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Backazimuth estimation reliability using surface wave polarization (2004)
    In:  Geophys. Res. Lett., Washington D.C., Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 31, no. 9, pp. 1-4, pp. L09611
    Details
    Publication Date: 2004
    Description: Backazimuth estimates derived from surface wave polarization can be used to test association of an observed surface wave with a seismic event. However, commonly used techniques for estimating the backazimuth are subject to a number of errors and are often inaccurate. We evaluate the performance of a new algorithm for determining Rayleigh wave propagation direction from the cross-correlation of the horizontal and Hilbert transformed vertical seismograms. This proves to be more accurate and much less error-prone than current automatic processing procedures, and the cross-correlation value provides a good measure of the reliability of the backazimuth estimate. Consequently, the new algorithm will permit more reliable event association at a lower magnitude threshold.
    Keywords: Horizontal to vertical spectral ratio ; Nakamura ; Spectrum ; NOISE ; Site amplification ; Surface waves ; Polarization ; Rayleigh waves ; Correlation ; Hilbert transform ; 7200 ; Seismology ; 7219 ; Seismology: ; Nuclear ; explosion ; seismology ; 7255 ; Surface ; waves ; and ; free ; oscillations ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    The Anza array: a high-dynamic-range, broadband, digitally radiotelemetered seismic array (1984)
    In:  Bull. Seism. Soc. Am., San Francisco, Pergamon, vol. 74, no. 6, pp. 1469-1481, pp. 1246
    Details
    Publication Date: 1984
    Keywords: Seismic networks ; Seismic arrays ; Detectors ; sta ; Broad-band ; Tele-communication ; Seismology ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Grouted sediment slices show signs of earthquake shaking (2001)
    In:  Eos Trans. AGU, Minsk, Elsevier Scientific Publishing Company, vol. 82, no. 49, pp. 603, pp. B12308
    Details
    Publication Date: 2001
    Keywords: paleo ; Seismology ; Geol. aspects ; 7221 ; Seismology ; Paleoseismology ; 1829 ; Hydrology ; Groundwater ; hydrology ; 7294 ; Instruments ; and ; techniques
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Source-dependent frequency content of ultrashallow seismic reflection data (2000)
    In:  Bull. Seism. Soc. Am., Washington D.C., Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 90, no. 2, pp. 494-499, pp. L09611
    Details
    Publication Date: 2000
    Keywords: Seismology ; Seismics (controlled source seismology) ; Spectrum ; Source ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    A case study of the sensitivity of forecast skill to data and data analysis techniques (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A series of experiments have been conducted to examine the sensitivity of forecast skill to various data and data analysis techniques for the 0000 GMT case of January 21, 1979. These include the individual components of the FGGE observing system, the temperatures obtained with different satellite retrieval methods, and the method of vertical interpolation between the mandatory pressure analysis levels and the model sigma levels. It is found that NESS TIROS-N infrared retrievals seriously degrade a rawinsonde-only analysis over land, resulting in a poorer forecast over North America. Less degradation in the 72-hr forecast skill at sea level and some improvement at 500 mb is noted, relative to the control with TIROS-N retrievals produced with a physical inversion method which utilizes a 6-hr forecast first guess. NESS VTPR oceanic retrievals lead to an improved forecast over North America when added to the control.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Some characteristics and advantages of LANDSAT 3 return beam vidicon images (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: One advantage of a LANDSAT 3 return beam vidicon (RBV) scene is the synoptic view it provides. A 1:500,000 paper print of the size 19.4 cm x 19.4 cm encompasses an area of about 3,721 square miles (9,637 sq. km.) and this compares very favorably in coverage to small scale aerial photography. A second important advantage is that the ground resolution is 38 by 38 meters. Compared to the resolution of the MSS which is 79 by 79 meters the RBV provides a wealth of detail useful for many purposes. A great variety of man made structures are visible including bridges, roads, docks, and small airfields. Agricultural field patterns are clear and settlements of various sizes can be identified and delineated. A third advantage is related to the approximate panchromatic spectral response displayed in RBV images. Since many aerial photographic interpreters are accustomed to working with panchromatic photographs, they should have no difficulty understanding and putting RBV images immediately into use.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Purdue Univ. CORSE-81: The 1981 Conf. on Remote Sensing Educ.; p 84-85
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    An assessment of the FGGE satellite observing system during SOP-1 (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The sensitivity of a Goddard Laboratory for Atmospheric Sciences global objective analysis cycle to the addition of FGGE level II-b data is assessed. The GOAS system comprises a predictive continuity provided by a model first-guess forecast integrated from a previous forecast and updated by data gathered in the interim. FGGE data originated in the Jan.-Mar. 1979 period and were acquired by rawinsondes, pilot balloons, surface stations, satellites, ships, and drifting buoys deployed during SOP-1. Focussing on 2-5 and 8-day forecasts, comparisons were made of the 6 hr forecast error at the 300 mb height in three experiments using all, no-satellite (NOSAT), and without rawinsondes or pilot balloons modes. Larger errors occurred in the case of NOSAT, while significant corrections to the GOAS predictions were noted using all the FGGE data. It was concluded that all forecasts were improved by inclusion of full FGGE data sets, including forecasting beyond one week.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: American Meteorological Society; vol. 63
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Numerical prediction of the monsoon depression of 5-7 July 1979 (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A well defined monsoon depression was used for two assimilation and forecast experiments: (1) using conventional surface and upper air data, (2) using these data plus Monex data. The data sets were assimilated and used with a general circulation model to make numerical predictions. The model, the analysis and assimilation procedure, the differences in the analyses due to different data inputs, and the differences in the numerical predictions are described. The MONEX data have a positive impact, although the differences after 24 hr are not significant. The MONEX assimilation does not agree with manual analysis location of depression center. The 2.5 x 3 deg horizontal resolution of the prediction model is too coarse. The assimilation of geopotential height data derived from satellite soundings generated gravity waves with amplitudes similar to the meteorologically significant features investigated.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: WMO Intern. Conf. on Early Results of FGGE and Large-Scale Aspects of its Monsoon Expt.; 8 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    The role of zonally asymmetric heating in the vertical and temporal structure of the global scale flow fields during FGGE SOP-1 (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: By examining the vertical structure of the low order spherical harmonics of the divergence and vorticity fields, the relative contribution of tropical and monsoonal circulations upon the global wind fields was estimated. This indicates that the overall flow over North America and the Pacific between January and February is quite distinct both in the lower and upper troposphere. In these longitudes there is a stronger tropical overturning and subtropical jet stream in January than February. The divergent flow reversed between 850 and 200 mb. Poleward rotational flow at upper levels is associated with an equatorward rotational flow at low levels. This suggests that the monsoon and other tropical circulations project more amplitude upon low order (global scale) representations of the flow than do the typical midlatitude circulations and that their structures show conspicuous changes on a time scale of a week or less.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: WMO Intern. Conf. on Early Results of FGGE and Large-Scale Aspects of its Monsoon Expt.; 9 p
    Format: text
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    NASA TECHNICAL REPORTS
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