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- Volume 12, Issue 10, 1994
First Break - Volume 12, Issue 10, 1994
Volume 12, Issue 10, 1994
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Random and systematic navigation errors: how do they affect seismic data quality?
Authors J. Paffenholz, D. Monk and D. FryarWhile the effects of streamer feather on binning and stacking of seismic data have been studied in the past (Levin 1983, 1984), a quantitative analysis of the effects of an error in the measurement of the cable feather has not been made. Such a systematic error could be caused, for example, by incorrect assessment of magnetic declination and would result in an apparent rotation of the cable. Random errors in the receiver positions caused by the limited accuracy of the navigation measurements are always present, but hopefully small. Houston (1991) estimated the maximum uncertainty in cable receiver positions for a state-of-the-art navigation system to be about 6 m, which is close to the limits considered to be geophysically acceptable by some authors (e.g. Jack 1993 ).
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Basin evolution in the Rockall region, North Atlantic
Authors P. M. Shannon, A.W.B. Jacob, J. Makris, B. O‘Reilly, F. Hauser and U. VogtThe continental shelf west of Ireland contains a number of large and relatively unexplored sedimentary basins. Most of these lie in deep waters and underlie bathymetric troughs (Fig. I). The Rockall Trough and the Hatton Basin (the Hatton-Rockall Basin of previous workers, e.g. Naylor and Shannon 1982) have an elongate orientation oblique to the Porcupine Basin and parallel to the narrow Slyne-Erris-Donegal basin complex (Fig. I). The Rockall Trough lies along strike from the Faeroe-Shetland basins which contain a number of recent significant oil discoveries, and its southern margin coincides with the eastern part of the Charlie Gibbs Fracture Zone. The Hatton Basin is separated from the Rockall Trough by the Rockall Bank while the Hatton Bank separates it from the Hatton Continental Margin, adjacent to the continental/ oceanic boundary (Fig. 1).
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2D and 3D refraction statics via tomographic inversion with under-relaxation
Authors C.G. Macrides and L.P. DennisThe computation of refraction static corrections is a difficult but important step towards obtaining reliable seismic stacked sections, particularly with land data. The difficulty lies in the high degree of variability of thickness and velocity of near surface layers. The importance lies in the fact that if subsequent processing tools such as velocity analysis, residual reflection statics and migration are to perform optimally it is imperative to first resolve the major sta tics problems using refraction techniques capable of broadband solutions.
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Volumes & issues
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Volume 42 (2024)
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Volume 41 (2023)
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Volume 40 (2022)
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Volume 39 (2021)
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Volume 38 (2020)
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Volume 37 (2019)
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Volume 36 (2018)
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Volume 35 (2017)
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Volume 34 (2016)
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Volume 33 (2015)
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Volume 32 (2014)
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Volume 31 (2013)
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Volume 30 (2012)
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Volume 29 (2011)
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Volume 28 (2010)
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Volume 27 (2009)
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Volume 26 (2008)
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Volume 25 (2007)
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Volume 24 (2006)
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Volume 23 (2005)
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Volume 22 (2004)
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Volume 21 (2003)
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Volume 20 (2002)
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Volume 19 (2001)
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Volume 18 (2000)
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Volume 17 (1999)
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Volume 16 (1998)
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Volume 15 (1997)
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Volume 14 (1996)
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Volume 13 (1995)
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Volume 12 (1994)
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Volume 11 (1993)
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Volume 10 (1992)
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Volume 9 (1991)
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Volume 8 (1990)
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Volume 7 (1989)
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Volume 6 (1988)
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Volume 5 (1987)
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Volume 4 (1986)
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Volume 3 (1985)
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Volume 2 (1984)
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Volume 1 (1983)