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  • 1
    Monograph available for loan
    Monograph available for loan
    Amsterdam : Elsevier
    Call number: AWI G8-88-0220
    Type of Medium: Monograph available for loan
    Pages: 470 S. : Abb. ; 24 cm
    ISBN: 0444424989
    Branch Library: AWI Library
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  • 2
    Series available for loan
    Series available for loan
    Kjeller : The Research Council of Norway
    Associated volumes
    Call number: S 99.0085(1-74/75)
    In: NORSAR Scientific Report
    Type of Medium: Series available for loan
    Pages: III, 52 S.
    Series Statement: NORSAR Scientific Report 74/75,1
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 3
    Series available for loan
    Series available for loan
    Kjeller : The Research Council of Norway
    Associated volumes
    Call number: S 99.0085(3-74/75)
    In: NORSAR Scientific Report
    Type of Medium: Series available for loan
    Pages: IV, 57 S.
    Series Statement: NORSAR Scientific Report 74/75,3
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 346 (1990), S. 165-168 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The roughly horizontal mantle reflectors were recorded on a 100-km-long experimental ultra-deep seismic reflection profile (OG-13) that was part of a comprehensive deep seismic survey (1,730 km; 16-s record length) conducted by the research vessel Mobil Search in the Skagerrak in 1987 (Fig. I)3. A ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 288 (1980), S. 473-475 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The refraction-wide-angle reflection seismic profile is indicated in Fig. 1, together with the two shot-point locations I and II. Five 3-component seismometers were moved along the profile at an average spacing of 2.5 km, while explosive charges of 25-300 kg were fired in water depths of 20 m at ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 280 (1979), S. 32-35 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A unique earthquake sequence began in Meløy, Northern Norway, in November 1978, and 10 weeks later about 10,000 shocks had been recorded from a volume not larger than 10×8×6 km3. The largest earthquake occurred on 28 November, 1978, with an ML magnitude of 3.2 and ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 294 (1981), S. 618-623 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Earth holography was applied to Norwegian Seismic Array (NORSAR) earthquake P-wave recordings. Simulation of the NORSAR sensor configuration indicates that a satisfactory reconstruction of the essential features of an embedded body is feasible with a depth resolution which seems to be better than ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 91 (1971), S. 56-70 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Simple delay and sum of sensors in a seismic array is an effective method for noise suppression. However, unless we have precise steering delays, much of the signal energy is lost during the beam forming process too. We have investigated possible error sources in time delay measurements, using a computerized cross-correlation procedure. Parameters perturbed are correlation window length and positioning, signal frequency content and signal to noise ratio (SNR). Our results indicate that relative low frequency waves and using the very first part of theP-signals give the most reliable and stable time delay values. High frequency bandpass filtering improves SNR, but signal correlation and the precision in beam steering corrections decrease. Significant loss of high frequency energy during beamforming seems to be unavoidable.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A description is given of the numerical FD scheme used to solve the elasti wave equation, including a few remarks on the source functions used. Our FD method has been used for computing synthetic seismograms for 2-D crust/upper mantle models of size 150 × 400 km2, with options for free-surface topography. The strategy was to introduce successively more complex lithosphere models for generating the synthetics; the reference model was laterally homogeneous lithosphere. The interface scattering was visualized through displays of free-surface synthetic waveforms and snapshots for models with a corrugated Moho only and free surface topography only. Near the free surface the latter seems to dominate, in the form of P-to-Rg and S-to-Rg conversions. Lithosphere randomizations were introduced through von Kármán functions of order n= 0.3, with rms velocity fluctuations of 3–4 per cent and correlation distances (horizontal and vertical) at 2.5 or 10 km. In case of a medium with only sub-Moho heterogeneities, those with horizontal anisotropy (ax= 10 km; az= 2.5 km) produced relatively strong Pn and Sn phases. The respective codas were dominated as in most of our experiments by P-to-S and S-to-S scattering wavelets excluding Rg scattering at a free surface with topography. For a medium with crustal heterogeneities, the distortions of the P and S wave trains with distance were clearly demonstrated. For full-scale heterogeneous lithosphere models, characteristic features of the synthetics were quantitatively similar to observational records of local events. Dominant attributes were a pronounced P coda consisting mainly of P- and Rg-scattered wavelets, and a relatively strong S coda consisting mainly of P-to-S and S-to-S scattered wavelets. The P and S waveforms are severely distorted pointing at the futility of reliably picking many secondary arrivals in local event recordings. Most of the scattering wavelets are confined to the crustal waveguide and to surface waves, since coda excitations for sensors at a depth of 100 km were weak and, moreover, consisted mainly of S wavelets. This implies that a strong teleseismic P coda does not reflect scattering within the crust in the source region but, rather, a complex source. Observational results from analysis of NORESS and ARCESS local event recordings are also presented. Clearly the lithosphere is not isotropically inhomogeneous. The essence of our 2-D FD synthetic seismogram experiments is that a simple lithosphere model, being moderately heterogeneous, gives rise to complex seismograms which are grossly similar to the observational recordings. In contrast, complex models derived from profiling surveys (but lacking the fine-scale random variations) give simple,‘ray tracing’like synthetics, not necessarily similar to the observed records.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The problem of discriminating between earthquakes and underground nuclear explosions is formulated as an exercise in pattern recognition approach analysis. an advantage of our procedure is flexibility, by combining both adaptive noise suppression and event classification incorporating feature selection criteria.The analysis has been applied to a learning set of 44 nuclear explosions (eight test sites) and 35 earthquakes in Eurasia recorded at the NORESS array (Fig. 1). the signal features considered were the normalized power in eight spectral bands in the 0.2-5.0 Hz range of the P wave (6 s) and the P coda (30 s). Physically, it means that we exploit potential differences in the shape of earthquake and explosion spectra, respectively. Other features included are peak P and P-coda amplitude frequencies and relative P/P-coda power. These 19 features were extracted either from conventional array beam traces or the optimum group filtered traces (OGF- removal of coherent low-frequency noise). Using the feature selection algorithm, based on estimates of the expected probability of misclassification (EPMC), only two to four features were needed for optimum discrimination performance. the dominant features were coda excitation and P- and P-coda power at lower signal frequencies. Furthermore, feature parameters extracted from the OGF traces had a slightly better performance in comparison to those extracted from beam traces. Finally, there were no misclassifications for OGF-derived features when the explosion population was limited to East Kazakh events, while including events from the other test sites lead to a decrease in discrimination power.
    Type of Medium: Electronic Resource
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