Applications of the Expanding Reflection Spread

Musgrave, A. W.

doi:10.1190/1.1439126

Cited by 23 publications

(7 citation statements)

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“…The expanding spread profile application utilized in this survey was developed by Stoffa and Buhl (1979) according to the theory of Musgrave (1962). The shooting and receiving vessels start from a common mid-point and travel apart on reciprocal bearings, maintaining equivalent shot and receiver distances along the track.…”

Section: Data Acquisitionmentioning

confidence: 99%

Seismic structure of the Hatton–Rockall area: an integrated seismic/modelling study from composite datasets

Neish¹

1993

PGC

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During 1987-9 the United Kingdom Department of Energy recorded coincident seismic reflection, sonobuoy wide-angle reflection and refraction, and expanding spread refraction data across the Hatton-Rockall Plateau, lying within the continental margin to the west of Scotland. Some 780 km of deep multichannel seismic reflection data were used to define and control the structural model. The presence of Tertiary basalts throughout the area gives rise to severe attenuation of incident energy and substantial velocity inhomogeneities. Information from 53 sonobuoys and 5 reversed expanding spread profiles recorded along the lines allow independent determination of velocity structure. An integrated model is constructed layer by layer from the surface down to Moho. Using information gained from these integrated datasets, the velocity-depth structure of the area can be determined across the entire margin and imaging at depth beneath the basalts substantially improved. Deep, upper mantle reflections are clearly seen beneath Rockall Bank. Evidence of probable Tertiary inversion is seen in Hatton Basin. The main structure of Hatton Bank is fault controlled, and both highly tilted fault blocks and oceanward-dipping reflector sequences are observed. The presence of a two-layer continental crust is revealed, thinned within Rockall Trough and deepening to the east beneath the Hebridean Platform and the west below Hatton-Rockall Plateau.The Hatton-Rockall area is located within the continental The Rockall and Hatton Bank passive continental margins margin to the west of Scotland (Fig. 1). Rockall Trough is a have been studied by a number of workers (e.g. Scrutton 1972; deep bathymetric depression lying between the British main- Bott et al. 1979;Roberts et al. 1981Roberts et al. , 1988; Joppen and White land and Rockall Plateau, which consists of Rockall Bank, 1990) but the structure, history, and evolution of the area have Hatton-Rockall Basin and Hatton Bank. remained enigmatic. Seismic data in the area are sparse and Fig. 1. Continental margin west of Britain. The solid line represents common-depth point tracks. Bathymetry in metres and major physiographic features are shown.

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Section: Data Acquisitionmentioning

confidence: 99%

Seismic structure of the Hatton–Rockall area: an integrated seismic/modelling study from composite datasets

Neish¹

1993

PGC

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“…Expanding reflection spreads of 25 km length (Musgrave 1962) were recorded across the Nebine Ridge and within the Surat Basin, coincident with the main reflection profile (Fig. 1).…”

Section: Other Seismic Profilingmentioning

confidence: 81%

“…Field statics corrections have been applied to all records, and shot statics corrections for the expanding spread seismograms were calculated by the method of Wright & Taylor (1986). Adjacent shots are plotted side by side and not in the alternating manner suggested buy Musgrave (1962). The shots that supplement the usual Musgrave configuration are plotted on the right.…”

Section: Near-vertical Incidence Reflection Profilingmentioning

confidence: 99%

A deep seismic profile of 800 km length recorded in southern Queensland, Australia

et al. 1987

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In 1984, the Australian Bureau of Mineral Resources and the Geological Survey of Queensland recorded a regional seismic reflection profile of over 800 km length from the eastern part of the Eromanga Basin to the Beenleigh Block east of the Clarence Moreton Basin. A relatively transparent upper crustal basement with an underlying, more reflective lower crust is characteristic of much of the region. Prominent westerly dipping reflectors occur well below the sediments of the eastern margin of the Clarence Moreton Basin and the adjacent Beenleigh Block, and provide some of the most interesting features of the entire survey. A wide angle reflectionhefraction survey of 192 km length and an expanding reflection spread of 25 km length were recorded across the Nebine Ridge. The only clear deep reflectors are interpreted as P-to-SV or SV-to-P converted reflections from a mid-crustal boundary at a depth of about 17 km. The combined Nebine Ridge data provide well-constrained P and S wave velocity models of the upper crust, and suggest a crustal structure quite different from that beneath the adjacent Mesozoic basins.

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“…Then, an NM0 correction at any particular time TO consists of taking all values recorded along the relevant parabola (i.e., for the desired specific value of the rms-velocity IL&) 2 in the T -x space, and independently shifting the values parallel to the T axis back to the straight line which passes through TO parallel to the x axis; the shifted values are then stored at their respective new locations. One can review the NM0 correction process in, e.g., Musgrave (1962). For digitally recorded seismic data, this process must be repeated incrementally at each time step along the data.…”

Section: Parabolic Nm0 Relationmentioning

confidence: 99%

A Novel High‐speed Algorithm for Summational Type Seismic Velocity Analyses*

Robinson

Aldrich

1972

Geophysical Prospecting

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Velocity analysis of reflection seismic data has increased in popularity with petroleum exploration personnel to such an extent that it now constitutes a significant tool in the routine digital processing program. One drawback to such an analysis is its computational cost, resulting from the numerous mathematical calculations required by a digital computer to extract comprehensive velocity information. The subject algorithm affords a computational cost saving of approximately one order of magnitude over a straightforward summational type velocity analysis with little sacrifice in accuracy. The utility of the algorithm is demonstrated on some Offshore Louisiana seismic data and a comparison of the results reveals that they are almost identical with a conventional velocity analysis. The algorithm is based on the concept that a normal‐moveout pattern of time shifts may be accurately applied over a considerable span of zero‐offset times to a CDP trace gather, rather than only at a single zero‐offset time. With each application however, the rms‐velocity associated with the moveout pattern is different. A specific relationship which associates an rms‐velocity with a zero‐offset time for the same moveout time delay pattern is approximated by numerical simulation studies on a digital computer.

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Applications of the Expanding Reflection Spread

Cited by 23 publications

References 0 publications

Seismic structure of the Hatton–Rockall area: an integrated seismic/modelling study from composite datasets

Seismic structure of the Hatton–Rockall area: an integrated seismic/modelling study from composite datasets

A deep seismic profile of 800 km length recorded in southern Queensland, Australia

A Novel High‐speed Algorithm for Summational Type Seismic Velocity Analyses*

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