Pockmarks: self-scouring seep features?
Pockmarks, or seafloor craters, occur worldwide in a variety of geologic settings and are often associated with fluid discharge. The mechanisms responsible for pockmark preservation, and pockmarks? relation to active methane venting are not well constrained. Simple numerical simulations run in 2-and 3-dimensions, and corroborated by flume tank experiments, indicate turbulence may play a role in pockmark maintenance, and, potentially, in pockmark excavation. Morphological analysis of the pockmarks indicates an abundance of flat-bottomed and/or elongated pockmarks. Pockmarks transition into furrows as the bay narrows and tidal flow is enhanced, providing unmistakable evidence of post-formation evolution. We hypothesize that some pockmarks formed from seafloor perturbations (e.g., gas or methane discharge), are1 maintained and gradually modified by vortical flow. This hypothesis provides a mechanism for pockmark preservation and enlargement without active fluid venting, which has implications for the interpretation of seafloor seep features in gas hydrates areas.
Additional publication details
|Publication type||Conference Paper|
|Publication Subtype||Conference Paper|
|Title||Pockmarks: self-scouring seep features?|
|Contributing office(s)||Woods Hole Coastal and Marine Science Center|
|Larger Work Type||Conference Paper|
|Larger Work Title||Proceedings of the 7th International Conference on Gas Hydrates|
|Conference Title||7th International Conference on Gas Hydrates|
|Conference Location||Edinburgh, Scotland|
|Conference Date||July 17-21 2011|
|Online Only (Y/N)||N|
|Additional Online Files (Y/N)||N|