Seismic, morphologic and scale variabilities of subsurface pipes and vent complexes in a magma-rich margin

Subsurface pipes related to fluid flow are observed in seismic reflection data as vertical to sub-vertical features of low-amplitude reflections, linking chaotic reflections at the base (root zones) of volcanic constructs to their summits which can comprise craters, mounds or eye-shaped vents. To da...

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Bibliographic Details
Published in:Bulletin of volcanology 2020-06, Vol.82 (6), Article 40
Main Authors: Omosanya, Kamaldeen Olakunle, Maia, Ana R., Eruteya, Ovie Emmanuel
Format: Article
Language:English
Subjects:
Coefficients
Correlation
Correlation coefficient
Earth and Environmental Science
Earth Sciences
Eocene
Fluid flow
Geology
Geophysics/Geodesy
Lava
Magma
Mineralogy
Morphometry
Mounds
Offshore
Pipes
Ratios
Reflection
Research Article
Scaling
Sedimentology
Seismic activity
Sills
Statistical analysis
Statistical methods
Volcanology
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Description
Summary:Subsurface pipes related to fluid flow are observed in seismic reflection data as vertical to sub-vertical features of low-amplitude reflections, linking chaotic reflections at the base (root zones) of volcanic constructs to their summits which can comprise craters, mounds or eye-shaped vents. To date, uncertainties remain regarding the linear correlation and scaling relationship between pipes and their overlying vent structures. Using 3D seismic reflection data from a magma-rich basin, the Vigrid Syncline in the Vøring Basin (offshore Norway), this study provides a seismic, morphometric and statistical description of forty (40) pipes and their associated structures. These pipes include conical, bifurcated, fault-controlled and columnar types, which are a consequence of the intrusion of two mappable magmatic sills of Early Eocene age. The heights (av. 1098 m), widths (av. 1740 m) and slenderness ratios (i.e. the heights/widths (Ω)) of the pipes (av. 0.6) show low to moderate correlation coefficients with vent parameters such as height (av. 258 m), area (av. 2.3 km 2 ) and ellipticity (av. 1.5). The morpho-statistical analyses provided here show that ‘pipe’ formation mechanisms are mutually exclusive and that vent geometries are not particularly systematic in nature.
ISSN:0258-8900
1432-0819
DOI:10.1007/s00445-020-01379-3