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  • 1
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    In:  Geophysical Journal International, Oslo, Wiley, vol. 165, no. 3, pp. 889-905, pp. 1008, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Two-dimensional ; NOISE ; Micro-tremor (seismic noise) ; Synthetic seismograms ; Seismic arrays ; Spectral analysis ; Site amplification ; Earthquake engineering, engineering seismology ; GJI ; Rhone ; valley, ; sedimentary ; basin, ; seismic ; array, ; seismic ; noise, ; spectral ; analysis, ; synthetic ; waveforms, ; Faeh ; Fah
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  • 2
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    In:  Pageoph, Luxembourg, Am. Soc. Mech. Eng., vol. 143, no. 1-2, pp. 513-536, pp. 2099, (ISBN 0-471-26610-8)
    Publication Date: 1994
    Keywords: Wave propagation ; Synthetic seismograms ; Modelling ; Site amplification ; Seismology ; Fah ; Faeh
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  • 3
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    In:  Bull. Seism. Soc. Am., Luxembourg, Am. Soc. Mech. Eng., vol. 84, no. 1-2, pp. 383-399, pp. 2099, (ISBN 0-471-26610-8)
    Publication Date: 1994
    Keywords: Seismology ; Strong motions ; Site amplification ; Modelling ; Synthetic seismograms ; combination ; BSSA ; Fah ; Faeh ; Zahradnik
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  • 4
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    In:  Geophys. J. Int., Luxembourg, Am. Soc. Mech. Eng., vol. 145, no. 2, pp. 535-549, pp. 2099, (ISBN 0-471-26610-8)
    Publication Date: 2001
    Keywords: NOISE ; Finite difference method ; Modelling ; mode ; summation ; genetic ; algorithms ; microtremors ; GJI ; Faeh ; Fah
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  • 5
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    In:  Bulletin of Earthquake Engineering, Philadelphia, 4, vol. 4, no. 1, pp. 65-94, pp. L01303, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Site amplification ; Horizontal to vertical spectral ratio ; Dispersion ; Micro-tremor (seismic noise) ; Shear waves ; Velocity ; Velocity depth profile ; BEE ; Faeh ; Fah ; SRICHWALSKI
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  • 6
    Publication Date: 2019
    Description: Abstract We performed modal analysis using frequency domain decomposition of ambient seismic vibration data collected on large rock slope instabilities. This technique enables a robust detection of resonance frequencies and provides the corresponding mode shape vectors. We applied the technique to synthetic and field data sets acquired by seismometer arrays on two rock instabilities in Switzerland. We found that, at the fundamental mode, the entire instability vibrates in‐phase with the dominant mode shape vector oriented perpendicular to dominant fracture systems. At higher frequencies, different compartments of the instability resonate antiphase. Therefore, delineating the zero crossings between the phases allows dominant fractures to be efficiently mapped. Approximately 1 hr of ambient vibration data suffices to apply the method successfully. The method also potentially detects hidden fractures that cannot be observed by geological field mapping. In addition, this approach combines classic amplification and polarization analysis into one technique, simplifying data processing efforts.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 7
    Publication Date: 2014-04-14
    Description: Computer simulations of large ( M  ≥ 7.8) earthquakes rupturing the southern San Andreas fault from SE to NW (e.g., ShakeOut, widely used for earthquake drills) have predicted strong long-period ground motions in the densely populated Los Angeles basin due to channeling of waves through a series of interconnected sedimentary basins. Recently, the importance of this waveguide amplification effect for seismic shaking in the Los Angeles basin has also been confirmed from observations of the ambient seismic field in the SAVELA experiment. By simulating the ShakeOut earthquake scenario (based on a kinematic source description) for a medium governed by Drucker-Prager plasticity, we show that nonlinear material behavior could reduce the earlier predictions of large long-period ground motions in the Los Angeles basin by up to 70% as compared to viscoelastic solutions. These reductions are primarily due to yielding near the fault, although yielding may also occur in the shallow low-velocity deposits of the Los Angeles basin if cohesions are close to zero. Fault zone plasticity remains important even for conservative values of cohesions, suggesting that current simulations assuming a linear response of rocks are overpredicting ground motions during future large earthquakes on the southern San Andreas fault.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 136 (1991), S. 529-560 
    ISSN: 1420-9136
    Keywords: Modal summation ; broad band ; Love waves ; anelasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We present an efficient scheme to compute high-frequency seismograms (up to 10 Hz) forSH-waves in a horizontally stratified medium with the mode summation method. The formalism which permits the computation of eigenvalues, eigenfunctions and related integral quantities is discussed in detail. Anelasticity is included in the model by using the variational method. Phase velocity, group velocity, energy integral and attenuation spectra of a structure enable the computation of complete strong motion seismograms, which are the basic tool for the interpretation of near-source broad-band data. Different examples computed for continental structures are discussed, where one example is the comparison between the observed transversal displacement recorded at station IVC for the November 4, Brawley 1976 earthquake and synthetic signals. In the case of a magnitudeM L =5.7 earthquake in the Friuli seismic area we apply the mode summation method to infer from waveform modeling of all three components of motion of observed data some characteristics of the source.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 143 (1994), S. 513-536 
    ISSN: 1420-9136
    Keywords: Local soil effects ; wave propagation ; numerical modelling ; seismic zonation ; seismic ground motion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Many of the numerical techniques used for seismic zonation studies treat one-dimensional structural models and/or the incidence of plane polarized body waves. These techniques are often not adequate for laterally heterogeneous structures and for sources that are not located beneath the site of interest. In such cases a more rigorous treatment of the combined effects of the source, the path and the site response is needed. This can be accomplished with a hybrid approach combining modal summation and the finite-difference technique. To demonstrate the differences between these techniques, the ground motion in the city of Benevento (Italy) is modelled. We first compare the results obtained with one-and two-dimensional structural models for vertical incidence of plane polarized body waves. These results are then compared with those obtained with the hybrid approach for two-dimensional structural models. The comparisons have allowed us to find important differences in the response obtained with the different modelling techniques. For the same site, these differences consist of strong variations in amplitude and in the shape of the spectral amplifications. For a seismic source which is not located beneath the site, vertical incidence of waves significantly overestimates the local hazard in a laterally homogeneous structure. For a laterally heterogeneous area, we can conclude that one-dimensional modelling fails to estimate the seismic hazard, whereas for a seismic source which is not located beneath the site of interest, two-dimensional modelling with vertical incidence of plane polarized body waves may not allow reliable estimates to be made of the frequency bands at which amplifications occur. The results obtained for two-dimensional structural models are used for a zonation of the city of Benevento.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The 3–D model of the Earth, as obtained with a brand new investigative technique, is discussed. However an international collaborative project, involving researchers from the whole world, has uncovered a severe systematic error in the new data acquisition system making the results of this new model highly questionable.
    Type of Medium: Electronic Resource
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