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  • 1
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    Love-type seam-waves in washout models of coal seams (1986)
    In:  Geophys. Prosp., Leipzig, 3-4, vol. 34, no. 2, pp. 1167-1184, pp. L06305, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1986
    Keywords: Surface waves ; Channel waves ; Seismics (controlled source seismology)
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Parameter estimation and fault detection by three-component seismic and geoelectrical surveys in coal mine (1987)
    In:  Geophys. Prosp., Leipzig, 3-4, vol. 35, no. 2, pp. 832-863, pp. L06305, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1987
    Keywords: Seismics (controlled source seismology) ; Channel waves ; Three component data ; Seismics (controlled source seismology) ; Geoelectrics
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Modellieren und Invertieren seismischer und geoelektrischer Untertagedaten (1988)
    DGMK Dt. Wiss. Ges. f. Erdöl, Erdgas u. Kohle e.V., Fachber. Aufsuchung u. Gewinnung in Zusammenarb. mit Unikontakt - Kontaktst. Univ./Wirtschaft d. Ruhr-Universität Bochum
    In:  Professional Paper, Inversion und Interpretation seismischer Daten, 8. Mintrop-Sem., Krefeld, DGMK Dt. Wiss. Ges. f. Erdöl, Erdgas u. Kohle e.V., Fachber. Aufsuchung u. Gewinnung in Zusammenarb. mit Unikontakt - Kontaktst. Univ./Wirtschaft d. Ruhr-Universität Bochum, vol. 65, no. 16, pp. 383-406, (ISBN 1-4020-1729-4)
    Details
    Publication Date: 1988
    Keywords: SEModelling ; Inversion ; Channel waves ; Mining geophysics ; Geoelectrics
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Untertägige Parameterbestimmung und Vorfelderkundung mit Hilfe von seismischen 3-Komponenten Registrierungen und geoelektrischen Messungen (1987)
    Dt. Geophys. Ges.
    In:  Vortrag gehalten auf der 47. Jahrestagung der DGG, Clausthal-Zellerfeld, Dt. Geophys. Ges., vol. 10, no. AFGL-TR-87-0244, pp. 569-576
    Details
    Publication Date: 1987
    Keywords: Mining geophysics ; Geoelectrics ; Seismics (controlled source seismology)
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Numerische modellseismische Untersuchungen zur Nachweisbarkeit von Auswaschungszonen in Steinkohlenflözen mit Hilfe von Love-Flözwellen (1984)
    Inst. f. Geophys., Ruhr-Univ. Bochum
    In:  Diplomarbeit, Oslo, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 10, no. AFGL-TR-87-0244, pp. 569-576
    Details
    Publication Date: 1984
    Keywords: Love-waves ; SEModelling ; Mining geophysics ; Channel waves
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    Ein Normalmodensummations- und ein Frequenz-Wellenzahl-Verfahren zur Modellierung, Rekompression und Migration dispersiver Flözwellen (1990)
    Inst. f. Geophys., Ruhr-Univ. Bochum
    In:  Dissertation, Berichte Reihe A, Clausthal-Zellerfeld, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 10, no. 28, pp. 569-576
    Details
    Publication Date: 1990
    Keywords: Applied geophysics ; seismic Migration ; Frequency ; Wave number analys. ; SEModelling ; Synthetic seismograms ; Dispersion ; Channel waves ; Seismics (controlled source seismology) ; NOModelling ; f-k-Analysis
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    BIBLIOGRAPHY SEISMOLOGY
  • 7
    Electronic Resource
    Electronic Resource
    LOVE-TYPE SEAM-WAVES IN WASHOUT MODELS OF COAL SEAMS (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 34 (1986), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The propagation of Love seam-waves across washouts of coal seams was studied by calculating synthetic seismograms with a finite-difference method. Seam interruption, seam end and seam thinning models were investigated. The horizontal offset, the dip of the discontinuities and the degree of erosion served as variable parameters. Maximum displacement amplitudes, relative spectral amplitudes and phase and group slowness curves were extracted from the synthetic seismograms.Both seam interruption and seam thinning reduce the maximum displacement amplitudes of the transmitted Love seam-waves. The degree of amplitude reduction depends on the horizontal offset and the degree of erosion. It is four times greater for a total seam interruption than for an equivalent seam thinning with a horizontal offset of four times the seam thickness. In a seam cut vertically, the impedance contrast between the coal and the washout filling determines the maximum displacement amplitudes of the reflected Love seam-waves. They diminish by a maximum factor of four in oblique interruption zone discontinuities with a dip of maximum 27°, and by a maximum factor of ten in a seam thinning with a degree of erosion of at least 22%.The analysis of the relative spectral amplitudes indicates a preferential transmission of those phases with frequencies below, and a preferential reflection of those phases with frequencies above the first mode Airy-phase. The relative spectral amplitudes of the reflected Love seam-waves show a distinct interference pattern of the waves reflected at both interruption zone discontinuities.The dispersion analysis reveals a flattening of the phase and group slowness curves with increasing frequencies, horizontal offset and degrees of erosion.These results imply that a detection of washouts in-mine will be possible in a frequency range including at least the first mode Airy-phase. An interference pattern and a flattening of the dispersion curve indicate a washout rather than other seam obstructions and leads to an estimate of the washout dimension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1986.tb00521.x
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  • 8
    Electronic Resource
    Electronic Resource
    PARAMETER ESTIMATION AND FAULT DETECTION BY THREE-COMPONENT SEISMIC AND GEOELECTRICAL SURVEYS IN A COAL MINE (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 35 (1987), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Three-component seismic and geoelectrical in-mine surveys were carried out in Lyukobanya colliery near Miskolc, Hungary to determine the in situ petrophysical parameter distributions and to detect inhomogeneities in the coal seam. The seismic measurements comprise an underground vertical seismic profile, using body waves, and an in-seam seismic amplitude-depth distribution and transmission survey, using channel waves. The geoelectrical measurements are based on the drift- and seam-sounding method.Interval traveltime-, amplitude-, multiple-filter- and polarization analysis methods are applied to the seismic data. They lead to a five-layer model for the strata including the coal seam. The coal seam and two underlying beds act as a seismic waveguide. The layer sequence supports the propagation of both normal and leaky mode channel waves of the Love- and Rayleigh type. A calculation of the total reflected energy for each interface using Knott's energy coefficients shows that the velocity ranges of high reflection energy and of normal and leaky mode wavegroups coincide. The excitation of wavegroups strongly depends on the seismic source. A simultaneous inversion of a geoelectrical drift- and seam-sounding survey prevents misinterpretations of the seismic data by clearly identifying the low-velocity coal seam as a high-resistivity bed. Calculations of dispersion and sounding curves improve the resolution of the slowness and resistivity in each layer.Both diminished amplitudes and distortions in the polarization of transmission seismo-grams and decreasing resistivities in a geoelectrical pseudosection of the coal seam are related to an inhomogeneity.A calculation of synthetic seismograms for Love and Rayleigh channel waves with the finite-difference and the Alekseev-Mikhailenko method agrees well with the field data for the main features, i.e., particular arrivals in the wave train, wavegroups, velocities and symmetries or asymmetries.This in-mine experiment demonstrates that the simultaneous acquisition, processing and interpretation of seismic and geoelectrical data improve the lithological interpretation of petrophysical parameter distributions. Coal seam inhomogeneities can also be detected more reliably by the two independent surveys than by one alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1987.tb02261.x
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  • 9
    Electronic Resource
    Electronic Resource
    Late Quaternary Seismic Stratigraphy of the Eastern Bengal Shelf (1998)
    Springer
    Marine geophysical researches 20 (1998), S. 57-71 
    Details
    ISSN: 1573-0581
    Keywords: Bengal Shelf ; seismic stratigraphy ; Parasound ; Late Quaternary ; subaqueous delta ; lowstand delta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An ultra-high-resolution seismic study of the eastern Bengal Shelf with the parametric narrow-beam echosounder Parasound allows the interpretation of late Quaternary depositional patterns in terms of seismic stratigraphy. Accommodation space was still present on the outer shelf during the last lowstand, where a prograding delta developed in the western survey area. Oolitic beach ridges were later formed on top of this lowstand delta. Farther east, large parts of the shelf were exposed to subaerial erosion and a river system extended seaward across the area. A subaqueous highstand delta prograded southwards following the maximum transgression about 7,000 years ago. Its foreset beds exhibit acoustic voids very likely generated by sediment liquefaction, possibly caused by episodic energetic events such as major cyclones and/or earthquakes. Bottomset sediments extend seaward close to the shelf break in the west, whereas no Holocene sediments cover the outer shelf in the east.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004375908399
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  • 10
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    Full waveform ultrasonic transmission seismograms: A fast new method for the determination of physical and sedimentological parameters of marine sediment cores (1996)
    American Geophysical Union
    Details
    Publication Date: 1996-10-10
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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