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  • 1
    facet.materialart.
    Unbekannt
    Crosshole seismic tomography (1989)
    In:  Geophysics, Leipzig, 3-4, vol. 54, no. 1, pp. 200-215, pp. L06305, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1989
    Schlagwort(e): Tomography ; Borehole geophys. ; Seismics (controlled source seismology) ; Applied geophysics
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 2
    facet.materialart.
    Unbekannt
    The computation of body wave synthetic seismograms in laterally homogeneous media (1985)
    In:  Rev. Geophys. Space Phys., Warszawa, Conseil de l'Europe, vol. 23, no. 2, pp. 105-163, pp. L19608, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1985
    Schlagwort(e): Modelling ; Synthetic seismograms ; Inhomogeneity ; Review article ; Seismology ; Seismics (controlled source seismology)
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 3
    facet.materialart.
    Unbekannt
    Yet another elastic plane-wave, layer-matrix algorithm (2003)
    In:  Geophysical Journal International, Warszawa, Conseil de l'Europe, vol. 154, no. 1, pp. 212-223, pp. L19608, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 2003
    Schlagwort(e): Modelling ; Wave propagation ; Synthetic seismograms ; Anisotropy ; Seismics (controlled source seismology) ; Haskell ; Langer ; block-diagonal ; decomposition ; second ; order ; minors ; MATLAB ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 4
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    Unbekannt
    Metolachlor dense non-aqueous phase liquid source conditions and plume attenuation in a dolostone water supply aquifer (2018)
    Geological Society of London
    Details
    Publikationsdatum: 2018
    Beschreibung: 〈p〉This paper reports a long-term field investigation of a fractured dolostone aquifer that was penetrated by a dense non-aqueous phase liquid. High-resolution source zone characterization shows the evolution of deep penetration to the back-diffusion conditions seen at the present day. Metolachlor, a common herbicide, was released into the overburden overlying a fractured dolostone aquifer within a short time window (1978–81). In 2000, the plume front arrived at a municipal supply well located 930 m down-gradient, increasing to a maximum concentration of 2 μg l〈sup〉–1〈/sup〉. Groundwater monitoring with high-resolution, depth-discrete multi-level sampling systems since 1992 shows a clearly delineated bedrock plume. Numerous rock core samples show metolachlor in the low-permeability rock matrix at the bottom of the aquifer. The mass distribution and bedrock hydraulic head pattern strongly suggest that metolachlor entered the bedrock as a free-phase dense non-aqueous phase liquid penetrating to the aquifer bottom, preferentially accumulating in some horizontal fractures, dissolving quickly as a result of the rapid groundwater flow and then diffusing into the rock matrix, where back-diffusion sustains a dilute, persistent and stable plume. Strong plume retardation by matrix diffusion and sorption has greatly mitigated the impact on water quality in the down-gradient supply well, allowing for its continued use, while back-diffusion and degradation maintain a persistent, dilute plume managed by appropriate monitoring.〈/p〉
    Print ISSN: 0375-6440
    Digitale ISSN: 2041-4927
    Thema: Geologie und Paläontologie
    Publiziert von Geological Society of London
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 5
    facet.materialart.
    Unbekannt
    Metolachlor dense non-aqueous phase liquid source conditions and plume attenuation in a dolostone water supply aquifer (2018)
    Geological Society (of London)
    Details
    Publikationsdatum: 2018-05-23
    Beschreibung: This paper reports a long-term field investigation of a fractured dolostone aquifer that was penetrated by a dense non-aqueous phase liquid. High-resolution source zone characterization shows the evolution of deep penetration to the back-diffusion conditions seen at the present day. Metolachlor, a common herbicide, was released into the overburden overlying a fractured dolostone aquifer within a short time window (1978–81). In 2000, the plume front arrived at a municipal supply well located 930 m down-gradient, increasing to a maximum concentration of 2 μg l –1 . Groundwater monitoring with high-resolution, depth-discrete multi-level sampling systems since 1992 shows a clearly delineated bedrock plume. Numerous rock core samples show metolachlor in the low-permeability rock matrix at the bottom of the aquifer. The mass distribution and bedrock hydraulic head pattern strongly suggest that metolachlor entered the bedrock as a free-phase dense non-aqueous phase liquid penetrating to the aquifer bottom, preferentially accumulating in some horizontal fractures, dissolving quickly as a result of the rapid groundwater flow and then diffusing into the rock matrix, where back-diffusion sustains a dilute, persistent and stable plume. Strong plume retardation by matrix diffusion and sorption has greatly mitigated the impact on water quality in the down-gradient supply well, allowing for its continued use, while back-diffusion and degradation maintain a persistent, dilute plume managed by appropriate monitoring.
    Print ISSN: 0305-8719
    Digitale ISSN: 2041-4927
    Thema: Geologie und Paläontologie
    Publiziert von Geological Society (of London)
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 6
    Digitale Medien
    Digitale Medien
    On head-wave amplitudes (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 1729-1731 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: The head-wave contribution to a reflection is investigated by two different methods and it is shown that the new result presented by Lerche and Hill [J. Math. Phys. 26, 1420 (1985)] for the head-wave amplitude is in error due to the use of an inappropriate mathematical method.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.527483
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Ray tracing in azimuthally anisotropic media—I. Results for models of aligned cracks in the upper crust (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 96 (1989), S. 0 
    Details
    ISSN: 1365-246X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Ray tracing through gradients in anisotropic materials is complicated by singularities where the two quasi-shear wave slowness sheets cross or touch. Difficulties associated with such points can be removed by explicitly including polarization in the ray tracing equations. Slowness sheet and wavefront plots show the polarization and velocity behavior of various anisotropy models of aligned cracks in the upper crust. A simple scaling of the elastic tensor with depth can be shown to be approximately correct for models of aligned cracks within an isotropic host matrix with a linear velocity gradient. Ray tracing examples for models of aligned cracks within a strong vertical velocity gradient in the uppermost crust demonstrate various features of azimuthal anisotropy, including amplitude and polarization anomalies and shear-wave splitting. Quasi-shear wave polarizations typically twist along ray paths, with stronger twisting near the symmetry axis in hexagonally symmetric media. Strong anisotropy can cause unusual effects, such as ray paths which have three turning points in laterally homogeneous models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb05250.x
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 8
    Digitale Medien
    Digitale Medien
    Ray tracing in azimuthally anisotropic media—II. Quasi-shear wave coupling (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 96 (1989), S. 0 
    Details
    ISSN: 1365-246X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Quasi-shear wave polarizations typically twist along ray paths through gradient regions in anisotropic media, causing frequency dependent coupling between the qS-waves. This coupling is much stronger than the analogous coupling between P- and SV-waves in isotropic gradients because of the small difference between the qS-wave velocities. Geometrical ray theory is typically valid for qS-waves only at relatively high frequencies, and does not converge to the isotropic result in the limit of infinitely weak anisotropy. Using the plane-wave layered response, we show examples of this coupling and how it may cause frequency dependent shear-wave polarizations. We consider two special cases where the coupling is especially strong in hexagonally symmetric media: (i) intersection singularities where the slowness sheets cross, and (ii) kiss singularities where the slowness sheets touch at the symmetry axis. We show numerical and asymptotic solutions for the pulses generated in these situations. In some cases, far-field excitation of both quasi-shear waves (and shear-wave splitting) will result from an incident wave composed of only one of the quasi-shear waves.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb05251.x
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 9
    Digitale Medien
    Digitale Medien
    A NONITERATIVE PROCEDURE FOR INVERTING PLANE-WAVE REFLECTION DATA AT SEVERAL ANGLES OF INCIDENCE USING THE RICCATI EQUATION (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 33 (1985), S. 0 
    Details
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: Various exact methods of inverting the complete waveform of vertical seismic reflection data to produce acoustic impedance profiles have been suggested. These inverse methods generally remain valid for nonvertical, plane-wave data, provided total reflection does not occur. Thus, in principle, the “seismogram” at each ray parameter in a slant stack can be interpreted separately.Rather than invert each plane-wave seismogram separately, they can all be interpreted simultaneously and an “average” model thus obtained. Inversion for both the velocity and the density also becomes possible when two or more plane-wave seismograms are simultaneously inverted. The theory for a noniterative inversion method, based on the time-domain Riccati equation, is discussed. Numerical examples of inversions using this technique on synthetic data demonstrate its numerical stability and the advantage of simultaneous inversion of several seismograms to reduce the effect of noise in the data and increase the stability of the inversion process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2478.1985.tb00428.x
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 10
    facet.materialart.
    Unbekannt
    On head‐wave amplitudes (1987)
    American Institute of Physics
    Details
    Publikationsdatum: 1987-08-01
    Print ISSN: 0022-2488
    Digitale ISSN: 1089-7658
    Thema: Mathematik , Physik
    Publiziert von American Institute of Physics
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
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