NissirosV1, Main, Exploration, bibRecord, 000099

Bottom pressure signals at the TAG deep‐sea hydrothermal field: Evidence for short‐period, flow‐induced ground deformation

Identifieur interne : 000099 ( Main/Exploration ); précédent : 000098; suivant : 000100

Bottom pressure signals at the TAG deep‐sea hydrothermal field: Evidence for short‐period, flow‐induced ground deformation

Auteurs : Robert A. Sohn [États-Unis] ; Richard E. Thomson [Canada] ; Alexander B. Rabinovich [Canada, Russie] ; Steven F. Mihaly [Canada]

Source :

Geophysical Research Letters [ 0094-8276 ] ; 2009-10.

RBID : ISTEX:172AF2305B24919471FDC2662A1D5A107E7E6839

English descriptors

Abstract

Bottom pressure measurements acquired from the TAG hydrothermal field on the Mid‐Atlantic Ridge (26°N) contain clusters of narrowband spectral peaks centered at periods from 22 to 53.2 minutes. The strongest signal at 53.2 min corresponds to 13 mm of water depth variation. Smaller, but statistically significant, signals were also observed at periods of 22, 26.5, 33.4, and 37.7 min (1–4 mm amplitude). These kinds of signals have not previously been observed in the ocean, and they appear to represent vertical motion of the seafloor in response to hydrothermal flow ‐ similar in many ways to periodic terrestrial geysers. We demonstrate that displacements of 13 mm can be produced by relatively small flow‐induced pressures (several kPa) if the source region is less than ∼100 m below the seafloor. We suggest that the periodic nature of the signals results from a non‐linear relationship between fluid pore pressure and crustal permeability.

Url:

https://api.istex.fr/document/172AF2305B24919471FDC2662A1D5A107E7E6839/fulltext/pdf

DOI: 10.1029/2009GL040006

Affiliations:

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Le document en format XML

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<front><div type="abstract">Bottom pressure measurements acquired from the TAG hydrothermal field on the Mid‐Atlantic Ridge (26°N) contain clusters of narrowband spectral peaks centered at periods from 22 to 53.2 minutes. The strongest signal at 53.2 min corresponds to 13 mm of water depth variation. Smaller, but statistically significant, signals were also observed at periods of 22, 26.5, 33.4, and 37.7 min (1–4 mm amplitude). These kinds of signals have not previously been observed in the ocean, and they appear to represent vertical motion of the seafloor in response to hydrothermal flow ‐ similar in many ways to periodic terrestrial geysers. We demonstrate that displacements of 13 mm can be produced by relatively small flow‐induced pressures (several kPa) if the source region is less than ∼100 m below the seafloor. We suggest that the periodic nature of the signals results from a non‐linear relationship between fluid pore pressure and crustal permeability.</div>
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Bottom pressure signals at the TAG deep‐sea hydrothermal field: Evidence for short‐period, flow‐induced ground deformation

Bottom pressure signals at the TAG deep‐sea hydrothermal field: Evidence for short‐period, flow‐induced ground deformation

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri