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  • 11
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    Preliminary study for determining magnitude from Lg (1967)
    In:  Earthquake Notes, Washington D.C., Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 38, no. 1, pp. 23-28, pp. L09611
    Details
    Publication Date: 1967
    Keywords: Seismology ; Magnitude ; Lg-waves
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    BIBLIOGRAPHY SEISMOLOGY
  • 12
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    Real-time earthquake location using Kirchhoff reconstruction (2005)
    In:  Bull. Seism. Soc. Am., Washington D.C., Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 95, no. 2, pp. 699-707, pp. L09611
    Details
    Publication Date: 2005
    Keywords: Seismology ; Real time earthquake monitoring ; Location ; Data analysis / ~ processing ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 13
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    Development of comprehensive seismic yield estimation system for underground nuclear explosions (1991)
    Phillips Laboratory Air Force Systems Command
    In:  scientific report, Hanscom Air Force Base, Phillips Laboratory Air Force Systems Command, vol. C 560, 183 pp., no. PL-TR-91-2161, pp. 1143-1146 (SL3.8), (ISBN 3-933346-037)
    Details
    Publication Date: 1991
    Keywords: Magnitude ; Energy (of earthquakes) ; Nuclear explosion ; Seismology ; Seismic arrays ; Data analysis / ~ processing
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    BIBLIOGRAPHY SEISMOLOGY
  • 14
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    Stability of coda Q in the region of Parkfield, California: View from the U.S. Geological Survey Parkfield Dense Seismograph Array (1995)
    In:  J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 100, no. 5379, pp. 2089-2102, pp. 1484, (ISSN 0343-5164)
    Details
    Publication Date: 1995
    Keywords: Quality factor ; Seismology ; Earthquake precursor: prediction research ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 15
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    A full waveform tomography algorithm for teleseismic body and surface waves in 2.5 dimensions (2014)
    Oxford University Press
    Details
    Publication Date: 2014-07-23
    Description: We describe a 2.5-D, frequency domain, viscoelastic waveform tomography algorithm for imaging with seismograms of teleseismic body and surface waves recorded by quasi-linear arrays. The equations of motion are discretized with p -adaptive finite elements that allow for geometric flexibility and accurate solutions as a function of wavelength. Artificial forces are introduced into the media by specifying a known wavefield along the model edges and solving for the corresponding scattered field. Because of the relatively low frequency content of teleseismic data, regional scale tectonic settings can be parametrized with a modest number of variables and perturbations can be determined directly from a regularized Gauss–Newton system of equations. Waveforms generated by the forward problem compare well with analytic solutions for simple 1-D and 2-D media. Tests of different approaches to the inverse problem show that the use of an approximate Hessian serves to properly focus the scattered field. We also find that while full waveform inversion can provide significantly better resolution than standard techniques for both body and surface wave tomography modelled individually, joint inversion both enhances resolution and mitigates potential artefacts.
    Keywords: Seismology
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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    PAPER CURRENT
  • 16
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    Increased ephemeris accuracy using attitude-dependent aerodynamic force coefficients for inertially stabilized spacecraft (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The FREEMAC program used to generate the aerodynamic coefficients, as well as associated routines that allow the results to be used in other software is described. These capabilities are applied in two numerical examples to the short-term orbit prediction of the Gamma Ray Observatory (GRO) and Hubble Space Telescope (HST) spacecraft. Predictions using attitude-dependent aerodynamic coefficients were made on a modified version of the PC-based Ephemeris Generation Program (EPHGEN) and were compared to definitive orbit solutions obtained from actual tracking data. The numerical results show improvement in the predicted semi-major axis and along-track positions that would seem to be worth the added computational effort. Finally, other orbit and attitude analysis applications are noted that could profit from using FREEMAC-calculated aerodynamic coefficients, including orbital lifetime studies, orbit determination methods, attitude dynamics simulators, and spacecraft control system component sizing.
    Keywords: AERODYNAMICS
    Type: Flight Mechanics(Estimation Theory Symposium, 1991; p 249-264
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 17
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    Developments and trends in three-dimensional mesh generation (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An intense research effort over the last few years has produced several competing and apparently diverse methods for generating meshes. Recent progress is reviewed and the central themes are emphasized which form a solid foundation for future developments in mesh generation.
    Keywords: AERODYNAMICS
    Type: NASA, Langley Research Center, Transonic Symposium: Theory, Application, and Experiment, Volume 1, Part 1; p 341-376
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 18
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    GRAVITATIONAL WAVE EXTRACTION FROM AN INSPIRALING CONFIGURATION OF MERGING BLACK HOLES (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: We present new techniques for evolving binary black hole systems which allow the accurate determination of gravitational waveforms directly from the wave zone region of the numerical simulations. Rather than excising the black hole interiors, our approach follows the "puncture" treatment of black holes, but utilizing a new gauge condition which allows the black holes to move successfully through the computational domain. We apply these techniques to an inspiraling binary, modeling the radiation generated during the final plunge and ringdown. We demonstrate convergence of the waveforms and and good conservation of mass-energy, with just over 3% of the system s mass converted to gravitational radiation.
    Keywords: Astrophysics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 19
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    Autonomous Sciencecraft Experiment (ASE) Test Operations in 2003 (2003)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: NASA has identified the development of an autonomously operating spacecraft as a necessity for an expanded program of missions exploring the Solar System. The Autonomous Sciencecraft Experiment (ASE) has been selected for flight demonstration by NASA s New Millennium Program (NMP) as part of the Space Technology 6 (ST6) mission. ASE is scheduled to fly on the US Air Force Research Laboratory (AFRL) Techsat-21 constellation in 2006. Tech- Sat-21 consists of three satellites flying in a variable-geometry formation in Earth orbit. Each satellite is equipped with X-band Synthetic Aperture Radar, yielding high spatial resolution images (approx. 3 m) of the Earth s surface. The constellation will fly at an altitude of 550 km, in a 35.4 inclination circular orbit, yielding exact repeat-track observations every 13 days. Prior to full deployment, elements of the versatile ASE spacecraft command and control software, image formation software and science processing software will be utilized and tested on two very different platforms in 2003: AirSAR and EO-1 (described below). Advantages of Autonomous Operations: ASE will demonstrate advanced autonomous science data acquisition, processing, and product downlink prioritization, as well as autonomous spacecraft command and control, and fault detection. The advantages of spacecraft autonomy are to future missions include: (a) making the best use of reduced downlink; (b) the overcoming of communication delays through decisionmaking in situ, enabling fast reaction to dynamic events; (c) an increase of science content per byte of returned data; and (d) an avoidance of return of null (no-change/no feature) datasets: if there is no change detectable between two scenes of the same target, there is no need to return the second dataset.
    Keywords: Astrophysics
    Type: Lunar and Planetary Science XXXIV; LPI-Contrib-1156
    Format: text
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    NASA TECHNICAL REPORTS
  • 20
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    Impact of LISA's Low Frequency Sensitivity on Observations of Massive Black Hole Mergers (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: LISA will be able to detect gravitational waves from inspiralling massive black hole (MBH) binaries out to redshifts z 〉 10. If the binary masses and luminosity distances can be extracted from the Laser Interferometer Space Antenna (LISA) data stream, this information can be used to reveal the merger history of MBH binaries and their host galaxies in the evolving universe. Since this parameter extraction generally requires that LISA observe the inspiral for a significant fraction of its yearly orbit, carrying out this program requires adequate sensitivity at low frequencies, f 〈 10(exp -4) Hz. Using several candidate low frequency sensitivities, we examine LISA's potential for characterizing MBH binary coalescences at redshifts z 〉 1.
    Keywords: Astrophysics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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