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  • 1
    Digitale Medien
    Digitale Medien
    Correction for water depth variations of marine crustal reflection seismic data using refraction statics (1992)
    Springer
    Marine geophysical researches 14 (1992), S. 65-76 
    Details
    ISSN: 1573-0581
    Schlagwort(e): underwater topography ; refraction statics ; crustal reflection seismology ; GLIMPCE
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract Water depth variations in marine reflection seismic profiling cause velocity push-down and, in regions of rapid fluctuations of the water-bottom slope, stack degradation. Static corrections are a very satisfactory and practical solution to these problems under typical survey conditions with water depths not exceeding a few hundred metres and relatively hard water bottoms. Static time shifts are best derived from a refraction analysis of first arrivals rather than from fathometer data, especially over underwater valleys where unconsolidated sediment of velocity close to that of water has been deposited unconformably onto the underlying lithified rocks. These points are illustrated by a field example from the GLIMPCE survey in Lake Superior. The availability of computer-effective algorithms such as the generalized linear inversion method allows the implementation of refraction statics during the initial processing of regional marine crustal surveys.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01674066
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Dereverberation of marine reflection seismic data by a spatial combination of predictive deconvolution and velocity filtering (1995)
    Springer
    Marine geophysical researches 17 (1995), S. 1-15 
    Details
    ISSN: 1573-0581
    Schlagwort(e): Water reverberations ; predictive deconvolution ; velocity filtering ; seismic reflection ; GLIMPCE
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract Contamination of seismic reflection records at early times by first-order water reverberations can be especially severe during survey operations over hard and flat sea floors on the continental shelf or in lake environments. A new dereverberation scheme based on two classical techniques — predictive deconvolution and velocity filtering — has been developed to address this problem. The techniques are combined spatially to take advantage of their complementary offset- and time-dependent properties. Stage I of the scheme consists of applying predictive deconvolution at short offset. The data are previously conditioned by a normal moveout correction with the water velocity which restores the periodicity of the reverberations in the offset-time plane and enhances the performance of deconvolution. Stage II of the scheme involves velocity filtering in the common-midpoint domain which is particularly effective at long offset where the moveout difference between primary reflections and reverberations is largest. The dereverberation scheme is well suited for the initial processing of large volumes of data due to the general availability of cost-effective deconvolution and velocity filtering algorithms in seismic processing software packages. Practical implementation issues are illustrated by a field example from the GLIMPCE survey in Lake Superior.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01268048
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