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  • 1
    Monograph available for loan
    Monograph available for loan
    Seismic wave propagation and scattering in the heterogenous earth (2012)
    Berlin : Springer Berlin
    Details Availability
    Call number: M 12.0099
    Description / Table of Contents: Focusing on recent developments in the area of seismic wave propagation and scattering, this text combines information from numerous sources to present a coherent introduction to the theory of scattering in acoustic and elastic materials. With the emphasis firmly on the lithosphere, the book includes analyses of observations using the theoretical methods developed. Written for advanced undergraduates and beginning graduates of geophysics and planetary sciences, this is also of interest to civil engineers, seismologists, acoustical engineers, and others interested in wave propagation through inhomogeneous elastic media.
    Type of Medium: Monograph available for loan
    Pages: XVI, 494 S. , 180 schw.-w. Ill., 1 schw.-w. Tab , 235 mm x 155 mm
    Edition: 2nd ed.
    ISBN: 9783642230288
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
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    Simulating the envelope of scalar waves in 2D random media having power-law spectra of velocity fluctuation (2003)
    In:  Bull. Seism. Soc. Am., Basel, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 93, no. 1-2, pp. 240-252, pp. 2274, (ISSN: 1340-4202)
    Details
    Publication Date: 2003
    Keywords: Modelling ; Waves ; Two-dimensional ; Inhomogeneity ; Spectrum ; Velocity ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    A method to allow temporal variation of velocity in travel-time tomography using microearthquakes induced during hydraulic fracturing (1998)
    In:  Tectonophysics, London, Am. Soc. Mech. Eng., vol. 289, no. 1-3, pp. 189-201, pp. B09401, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1998
    Keywords: Tomography ; Travel time ; Induced seismicity ; Seismicity ; Hydraulic fracturing ; Stress
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Improved relative locations of clustered earthquakes using constrained multiple event location (2000)
    In:  Bull. Seism. Soc. Am., London, Am. Soc. Mech. Eng., vol. 90, no. 3, pp. 775-780, pp. B09401, (ISBN: 0534351875, 2nd edition)
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    Publication Date: 2000
    Keywords: Location ; Seismology ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Spatial correlation of seismic slip at the HDR-Soultz geothermal site: qualitative approach (2000)
    In:  Bull. Seism. Soc. Am., Houston, Akademie-Verlag, vol. 90, no. 6, pp. 1528-1534, pp. L08310, (ISSN: 1340-4202)
    Details
    Publication Date: 2000
    Keywords: Seismicity ; Geothermics ; Modelling ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    Monitoring viscosity changes from time-lapse seismic attenuation: case study from a heavy oil reservoir (2015)
    Wiley
    Details
    Publication Date: 2015-01-17
    Description: ABSTRACT Heating heavy oil reservoirs is a common method for reducing the high viscosity of heavy oil and thus increasing the recovery factor. Monitoring of these viscosity changes in the reservoir is essential for delineating the heated region and controlling production. In this study, we present an approach for estimating viscosity changes in a heavy oil reservoir. The approach consists of three steps: measuring seismic wave attenuation between reflections from above and below the reservoir, constructing time-lapse Q and Q −1 factor maps, and interpreting these maps using Kelvin–Voigt and Maxwell viscoelastic models. We use a 4D relative spectrum method to measure changes in attenuation. The method is tested with synthetic seismic data that are noise free and data with additive Gaussian noise to show the robustness and the accuracy of the estimates of the Q-factor. The results of the application of the method to a field data set exhibit alignment of high attenuation zones along the steam-injection wells, and indicate that temperature dependent viscosity changes in the heavy oil reservoir can be explained by the Kelvin–Voigt model.
    Print ISSN: 0016-8025
    Electronic ISSN: 1365-2478
    Topics: Geosciences , Physics
    Published by Wiley
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  • 7
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    Characterizing the nonlinear interaction of S- and P-waves in a rock sample (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-01-17
    Description: The nonlinear elastic response of rocks is known to be caused by the rocks' microstructure, particularly cracks and fluids. This paper presents a method for characterizing the nonlinearity of rocks in a laboratory scale experiment with a unique configuration. This configuration has been designed to open up the possibility of using the nonlinear characterization of rocks as an imaging tool in the field. In our experiment, we study the nonlinear interaction of two traveling waves: a low-amplitude 500 kHz P-wave probe and a high-amplitude 50 kHz S-wave pump in a room-dry 15 × 15 × 3 cm slab of Berea sandstone. Changes in the arrival time of the P-wave probe as it passes through the perturbation created by the traveling S-wave pump were recorded. Waveforms were time gated to simulate a semi-infinite medium. The shear wave phase relative to the P-wave probe signal was varied with resultant changes in the P-wave probe arrival time of up to 100 ns, corresponding to a change in elastic properties of 0.2%. In order to estimate the strain in our sample, we also measured the particle velocity at the sample surface to scale a finite difference linear elastic simulation to estimate the complex strain field in the sample, on the order of 10 −6 , induced by the S-wave pump. We derived a fourth order elastic model to relate the changes in elasticity to the pump strain components. We recover quadratic and cubic nonlinear parameters: β ̃ = − 872 and δ ̃ = − 1.1 × 10 10 , respectively, at room-temperature and when particle motions of the pump and probe waves are aligned. Temperature fluctuations are correlated to changes in the recovered values of β ̃ and δ ̃ , and we find that the nonlinear parameter changes when the particle motions are orthogonal. No evidence of slow dynamics was seen in our measurements. The same experimental configuration, when applied to Lucite and aluminum, produced no measurable nonlinear effects. In summary, a method of selectively determining the local nonlinear characteristics of rock quantitatively has been demonstrated using traveling sound waves.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 8
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    SH wave scattering from 2-D fractures using boundary element method with linear slip boundary condition (2011)
    Oxford University Press
    Details
    Publication Date: 2011-11-23
    Description: SUMMARY A boundary element method (BEM) combined with a linear slip boundary condition is proposed to calculate  SH  wave scattering from fractures in the frequency domain. The linear slip boundary condition was proposed by Schoenberg to model elastic wave propagation through an imperfectly bonded interface, where the traction cross the interface is continuous and displacement is discontinuous. Here, we demonstrate how to simulate  SH  wave scattering from fractures by applying the BEM and this linear slip boundary condition. We compare the displacement discontinuity across a traction-free crack calculated using the BEM and an analytical model to show the validity and accuracy of our approach. Comparisons between results obtained using our model with those obtained using a finite difference method are also performed and very good matches between these two methods are found. An example of  SH  wave scattering from three curved, crossing fractures is also given.
    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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  • 9
    Electronic Resource
    Electronic Resource
    MODERN IMAGING USING SEISMIC REFLECTION DATA* (2002)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Earth and Planetary Sciences 30 (2002), S. 259-284 
    Details
    ISSN: 0084-6597
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Geosciences , Physics
    Notes: Abstract Imaging using seismic reflection data has undergone tremendous advances over the past few years. The advances have been fostered in part by the availability of faster computers that have made more reliable algorithms for migration imaging feasible. The conventional approach to migration imaging, ray-based Kirchhoff migration, has been improved by the use of multiple-valued traveltime tables, ray amplitudes, and ray phases that can be calculated from various ray-tracing implementations. Wave-equation imaging, based on implementations of solutions of the wave equation, one-way wave equation, and approximations to the Lippmann-Schwinger equation, has become tractable. Wave-equation methods take account of wave phenomena such as focusing, defocusing, and diffraction that are important in many geological environments where imaging is used for petroleum exploration. There have also been applications of various types of migration imaging in basic studies of Earth structure. Such studies have been made to investigate deep Earth structure and large-scale lithospheric structure using waveforms from teleseisms as sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.earth.30.091201.140909
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  • 10
    Electronic Resource
    Electronic Resource
    Separation of scattering and intrinsic attenuation for the Kanto-Tokai region, Japan, using measurements of S-wave energy versus hypocentral distance (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 108 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Determining the relative amount of attenuation caused by scattering and intrinsic absorption is important to the understanding of wave propagation and attenuation in the heterogeneous lithosphere. A recently developed model based on radiative transfer theory provides a method for quantifying the ratio of scattering loss to total attenuation, which is called seismic albedo. The basic assumption of this model is that the medium is composed of a uniform distribution of isotropic scatterers. The method is based on a theoretical result showing that the variation with sourcereceiver distance in the seismic energy integrated over time is directly related to albedo and total attenuation, Qt−1. We introduce an improvement in the previously used method which results in more reliable estimates of seismic albedo and Qt−1 which can be used to calculate the losses due to scattering and intrinsic absorption. We call our new method multiple lapse-time window analysis. The improvement is based on the observation that the relationship between integrated energy and distance is strongly dependent on the time duration over which energy is integrated. We show that parameters describing media attenuation can be estimated from measurements of two ratios from the integrated energy versus distance relations compiled using two time windows for integration. One ratio is the energy integrated from 0 to 15 s after the S-wave arrival observed at 50 km source-receiver distance divided by the energy in the same time interval observed at 150 km distance. The second ratio is the energy integrated from 0 to 15 s observed at 150 km divided by that from 30 to 100 s observed at the same source-receiver distance.Integrated energy calculated for many source-receiver pairs may be corrected for relative site amplification and relative source amplitude determined using the coda-wave method. These corrections allow us to use data from many sourcereceiver pairs to find a well-constrained energy versus distance relation. Site amplifications relative to a reference station are calculated for three frequency bands by determining the ratio of the spectral amplitude in each band at one station for a 10 s time window to that at the reference station in the same 10 s time window. Ratios are calculated for many 10 s time windows for each of 10 events. For each station, we found little scatter in the ratios among the windows and events used. The average of all the ratios obtained for each station was taken to be the site amplification relative to the reference station.We applied the multiple lapse-time window analysis method and source-site correction procedures to data from the Kanto-Tokai region of Japan and found that intrinsic attenuation Qi−1 is larger than scattering attenuation Qs−1 over three frequency bands; 1–2, 2–4, and 4–8 Hz. We found that estimates of coda-wave attenuation Qc−1 made using the coda-wave method, are similar to the intrinsic attenuation Q; for the frequency range of 2–8Hz. We were unable to fit data for a third integration time window for the lowest frequency band studied. Our inability to fit all the data might be due to the assumptions that scattering is isotropic, that scatterers are uniformly distributed, and that only body waves are observed. We found that the site amplifications and seismic albedos determined for vertical and north-south components of motion are similar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb03470.x
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