scholarly journals Nature of the lithosphere across the Variscan orogen of SW Iberia: Dense wide-angle seismic reflection data

2009 ◽  
Vol 114 (B2) ◽  
Author(s):  
I. Palomeras ◽  
R. Carbonell ◽  
I. Flecha ◽  
F. Simancas ◽  
P. Ayarza ◽  
...  
Keyword(s):  
Seismic Reflection ◽  
Wide Angle ◽  
Seismic Reflection Data ◽  
Reflection Data ◽  
Variscan Orogen

Migration of wide-angle seismic reflection data from the Grenville front in Lake Huron

1990 ◽  
Vol 110 (B7) ◽  
pp. 10987
Author(s):  
B. Milkereit ◽  
D. Epili ◽  
A. G. Green ◽  
R. F. Mereu ◽  
P. Morel-À-L’Huissier
Keyword(s):  
Seismic Reflection ◽  
Lake Huron ◽  
Wide Angle ◽  
Seismic Reflection Data ◽  
Reflection Data

Shifted-elliptical nonstretch moveout correction of wide-angle seismic data in the τ-p domain, using an example from the Faeroe-Shetland Basin

Geophysics ◽  
2012 ◽  
Vol 77 (5) ◽  
pp. B227-B236 ◽  
Author(s):  
Hassan Masoomzadeh ◽  
Satish C. Singh ◽  
Penny J. Barton
Keyword(s):  
Seismic Data ◽  
Seismic Reflection ◽  
Wide Angle ◽  
Data Set ◽  
Seismic Reflection Data ◽  
Reflection Data ◽  
Angle Data ◽  
Vertical Heterogeneity ◽  
P Domain

We developed a method of moveout correction in the [Formula: see text] domain to tackle some of the problems associated with processing wide-angle seismic reflection data, including residual moveout and normal-moveout stretching. We evaluated the concept of the shifted ellipse in the [Formula: see text] domain as an alternative to the well-known concept of the shifted hyperbola in the [Formula: see text] domain. We used this shifted-ellipse concept to address the problem of residual moveout caused by vertical heterogeneity in the subsurface. We also addressed the stretching problem associated with dynamic corrections by combining selected strips from a set of constant-moveout stacks generated using a shifted-ellipse equation. Application of this method to a wide-angle data set from the Faeroe-Shetland Basin provided an enhanced image of the subbasalt structure.

scholarly journals Processing of pre-critical wide-angle seismic reflection data from the BABEL project

1995 ◽  
Vol 122 (1) ◽  
pp. 1-15 ◽  
Author(s):  
T. Dahl-Jensen ◽  
G. Lindsey ◽  
A. Law ◽  
D. Snyder
Keyword(s):  
Seismic Reflection ◽  
Wide Angle ◽  
Seismic Reflection Data ◽  
Reflection Data

scholarly journals The Marchenko method for evanescent waves

2020 ◽  
Vol 223 (2) ◽  
pp. 1412-1417
Author(s):  
Kees Wapenaar
Keyword(s):  
Seismic Reflection ◽  
State Of The Art ◽  
Evanescent Waves ◽  
Wide Angle ◽  
Model Errors ◽  
Multiple Reflections ◽  
Seismic Reflection Data ◽  
Reflection Data ◽  
Propagating Waves ◽  
Refracted Waves

SUMMARY With the Marchenko method, Green’s functions in the subsurface can be retrieved from seismic reflection data at the surface. State-of-the-art Marchenko methods work well for propagating waves but break down for evanescent waves. This paper discusses a first step towards extending the Marchenko method for evanescent waves and analyses its possibilities and limitations. In theory both the downward and upward decaying components can be retrieved. The retrieval of the upward decaying component appears to be very sensitive to model errors, but the downward decaying component, including multiple reflections, can be retrieved in a reasonably stable and accurate way. The reported research opens the way to develop new Marchenko methods that can handle refracted waves in wide-angle reflection data.

Migration of wide-angle seismic reflection data from the Grenville Front in Lake Huron

1990 ◽  
Vol 95 (B7) ◽  
pp. 10987 ◽  
Author(s):  
B. Milkereit ◽  
D. Epili ◽  
A. G. Green ◽  
R. F. Mereu ◽  
P. Morel-à-l'Huissier
Keyword(s):  
Seismic Reflection ◽  
Lake Huron ◽  
Wide Angle ◽  
Seismic Reflection Data ◽  
Reflection Data

scholarly journals New numerical and theoretical model to characterize the upper crustal structure of the Moroccan atlas from wide-angle seismic reflection data

2015 ◽  
Vol 8 ◽  
pp. 279-301
Author(s):  
Fadila Ouraini ◽  
Kamal Gueraoui ◽  
Puy Ayarza ◽  
David Marti ◽  
Ramon Carbonell ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Crustal Structure ◽  
Seismic Reflection ◽  
Wide Angle ◽  
Seismic Reflection Data ◽  
Reflection Data

scholarly journals Intrarift fault fabric, segmentation, and basin evolution of the Lake Malawi (Nyasa) Rift, East Africa

Geosphere ◽  
2020 ◽  
Vol 16 (5) ◽  
pp. 1293-1311
Author(s):  
Christopher A. Scholz ◽  
Donna J. Shillington ◽  
Lachlan J.M. Wright ◽  
Natalie Accardo ◽  
James B. Gaherty ◽  
...  
Keyword(s):  
Strain Rate ◽  
East Africa ◽  
Seismic Reflection ◽  
Lake Malawi ◽  
Rift System ◽  
Wide Angle ◽  
Seismic Reflection Data ◽  
Reflection Data ◽  
Border Fault ◽  
Low Strain Rate

Abstract The Lake Malawi (Nyasa) Rift, in the East African Rift System (EARS), is an ideal modern analogue for the study of extensional tectonic systems in low strain rate settings. The seismically active rift contains the 700-m-deep Lake Malawi, one of the world’s oldest and largest freshwater lakes with one of the most diverse endemic faunal assemblages on Earth. Modern and reprocessed legacy multichannel seismic-reflection data are constrained by velocity information from a wide-angle seismic experiment to evaluate variability in extension, segmentation, and timing of fault development along the 550-km-long rift zone. Fault geometries and patterns of synrift sediment fills show that the Lake Malawi Rift is composed of three asymmetric rift segments, with intervening accommodation zone morphologies controlled by the degree of overlap between segment border faults. Most extension occurs on the basin border faults, and broadly distributed extension is only observed at one accommodation zone, where no border fault overlap is observed. Structural restorations indicate a weakly extended rift system (∼7 km), with diminishing values of extension and thinner rift fill from north to south, suggesting a progressively younger rift to the south. There is no evidence of diking, sill injection, or extrusives within the synrift fill of the Lake Malawi Rift, although the volcanic load of the Rungwe magmatic system north of the lake and related subsidence may explain the presence of anomalously thick synrift fill in the northernmost part of the lake. The thickest synrift depocenters (∼5.5 km) are confined to narrow 10- to 20-km-wide zones adjacent to each rift segment border fault, indicating concentration of strain on border faults rather than intrarift faults. Intrarift structures control axial sediment delivery in the North and Central rift segments, focusing sediment into confined areas resulting in localized overpressure and shale diapirs. The asymmetric, basement-controlled relief was established early in rift development. When overprinted with frequent high-amplitude hydroclimate fluctuations, which are well documented for this basin, the resulting highly variable landscape and lake morphometry through time likely impacted the diverse endemic faunas that evolved within the basin. New seismic-reflection data, augmented by wide-angle seismic data and age constraints from drill core, offer the most highly resolved 3D view to date of latest Cenozoic extensional deformation in East Africa and provide a foundation for hazards analysis, resource assessments, and constraining deformation in a low strain rate, magma-poor active rift.

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