Bottom pressure signals at the TAG deep‐sea hydrothermal field: Evidence for short‐period, flow‐induced ground deformation
Identifieur interne : 000158 ( Istex/Curation ); précédent : 000157; suivant : 000159Bottom 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.
English descriptors
- KwdEn :
- Active mound, Bottom pressure data, Bottom pressure measurements, Bottom pressure signals, Caldera, Campi flegrei caldera, Detachment fault, Direct comparisons, Dsrv alvin, Earth planet, Elastic parameters, Elastic plate, Flexural parameter, Fluid flow, Geophys, Geyser, Ground deformation, Ground displacement signal, Hydrothermal, Hydrothermal field, Hydrothermal flow, Ocean sciences, Overlying water column, Phase transitions, Point load, Pressure cycles, Ridge crest, Rona, Same gauge, Seafloor, Seafloor pressure time series data, Shallow crust, Small overpressures, Sohn, Source mechanism, Thomson, Tide gauge, Vertical displacement, Volume expansion, Woods hole.
- Teeft :
- Active mound, Bottom pressure data, Bottom pressure measurements, Bottom pressure signals, Caldera, Campi flegrei caldera, Detachment fault, Direct comparisons, Dsrv alvin, Earth planet, Elastic parameters, Elastic plate, Flexural parameter, Fluid flow, Geophys, Geyser, Ground deformation, Ground displacement signal, Hydrothermal, Hydrothermal field, Hydrothermal flow, Ocean sciences, Overlying water column, Phase transitions, Point load, Pressure cycles, Ridge crest, Rona, Same gauge, Seafloor, Seafloor pressure time series data, Shallow crust, Small overpressures, Sohn, Source mechanism, Thomson, Tide gauge, Vertical displacement, Volume expansion, Woods hole.
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:
DOI: 10.1029/2009GL040006
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ISTEX:172AF2305B24919471FDC2662A1D5A107E7E6839Le 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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