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Namibian Margin Balancing Regional Project

VSA Author: Rob Butler
Scenes: 5
Interpretations: 1
Date Created: 2009-08-17

This version of the VERNOB-03 profile across the continental margin of Namibia supports a structural investigation that compares the amount of extension with the amount of contraction generated during gravity tectonics. The scenes consider the thrust belt and extensional domains independently, while the higher resolution image of the thrust belt may be used to assess the presence of distributed strains. Further discussion in Butler & Paton 2010, "Evaluating lateral compaction in deepwater fold and thrust belts: How much are we missing from “nature's sandbox”?" GSA Today 20 (3). See docs & links.



Scenes related to this Regional Project

A high resolution version of the thrust belt, Namibia Scene

VSA Author: Rob Butler
Interpretations: 0
Date Created: 2009-08-17

High quality seismic reflection data reveal thrust and fold structural geometry offshore Namibia. The lack of image distortion and amplitude variations associated with structures indicates a generally simple seismic velocity structure that is a function of depth rather than stratigraphy. Note the preservation of amplitude up to the thrust cut-offs, with almost no loss in data quality....

Balancing the toe-of-slope thrust belt, Namibia Scene

VSA Author: Rob Butler
Interpretations: 2
Date Created: 2009-08-17

The uninterpreted version of the thrust belt at the toe of slope for DW Namibia. The section is shown with no significant vertical exaggeration (assuming a seismic velocity of 2.7 km/s).

Interpreting a deepwater thrust system: offshore Namibia Scene

VSA Author: Rob Butler
Interpretations: 1
Date Created: 2021-02-18

This image can be used as a simple interpretation exercise in structural geology. There is a debrief pdf in the doc and links that goes through an interpretation workflow - leading to the associated interpretation uploaded here. The aim here is to build an interpretation of stratigraphic horizons through a thrust belt. Three horizon are identified. trace these through the array of th...

study of thrust zone - toe thrust from deep-water Namibia Scene

VSA Author: Rob Butler
Interpretations: 1
Date Created: 2015-01-28

Part of a regional 2D line provided to the VSA by CGG. This is a detail of the larger profile through the toe thrust array in Namibia. The image is slightly over 1s by about 5 km wide.

The extensional domain, offshore Namibia Scene

VSA Author: Rob Butler
Interpretations: 1
Date Created: 2009-08-17

An uninterpreted version of the extensional domain, offshore Namibia, with a vertical exaggeration of approximately 3.75:1, assuming a constant velocity of 2.7 km/s.

Interpretations related to this Regional Project

All Namibian Margin Balancing - overview Interpretation

VSA Author: Rob Butler
Date Created: 2009-08-17

This interpreted section shows arbitrary picks and designation of units in the extensional domain, and two markers in the contractional domain. Note that the vertical exaggeration is approximately 7:1 . assuming a mean seismic velocity of 2.7 km/s. See the scenes for this image for further comments.



Details:

  • Regional Project Administrator:
    • Rob Butler
  • VSA Author:
    • Rob Butler

Geological Context

Plate Settings and Margins
Passive
Tectonics
DW fold-thrust belts, Shale
Basin Setting
Passive Margin

Geographic Context

Physical Geography
Shelf-Slopes
Political Geography
Namibia, Republic of

Geophysics

Survey Information
Marine, Multichannel 2D
Data Presentation
Vertical Scale - Time, Amplitude
Image Type
Vertical Profile

Format Title Authors Date Modified Date Authored Size Actions
Butler & Paton 2010 GSAToday Rob Butler
 04/10/2010 04/10/2010 2 MB
Online pdf of the article by Butler & Paton describing the restoration of the gravity sliding of the Namibian continental margin and its implications for lateral compaction.

Related links