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Abstract

Summary

We study a linear feature observed at the seabed using side-scan sonar. We investigate potential causal mechanisms for the feature and test a range of possible hypotheses. The origin of this feature is important for determining the nature of possible fluid flow regimes in the shallow sub-surface, past and present.

Our main finding is that the linear feature of interest is on the margin of a large sub-glacial channel or tunnel valley. This channel is mainly sand filled and overlain by clay-rich strata. The channel appears to be partially gas charged (based on evidence from seismic amplitudes and seabed observations), and small pressure changes due to accumulated gas within the channel have most likely led to some surface displacements and gas escape at the seabed.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.20142141
2014-09-08
2024-04-26

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References

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20142141
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Characterisation of a Submarine Glacial Channel and Related Linear Features
Conference Proceedings 2014, 1 (2014); https://doi.org/10.3997/2214-4609.20142141
/content/papers/10.3997/2214-4609.20142141
/content/papers/10.3997/2214-4609.20142141
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