Bottom pressure signals at the TAG deep-sea hydrothermal field : evidence for short-period, flow-induced ground deformation
Figure S1: Multiple filter analysis used to show the persistence of the short-period pressure signal over a 28-day observation period. (1.031Mb)
Figure S1: Multiple filter analysis used to show the persistence of the short-period pressure signal over a 28-day observation period. (189.3Kb)
Table S1: Mechanical parameters used for modeling ground surface displacement due to a buried fluid pressure source. (25.95Kb)
Sohn, Robert A.
Thomson, Richard E.
Rabinovich, Alexander B.
Mihaly, Steven F.
MetadataShow full item record
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.
Author Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 36 (2009): L19301, doi:10.1029/2009GL040006.
Suggested CitationArticle: Sohn, Robert A., Thomson, Richard E., Rabinovich, Alexander B., Mihaly, Steven F., "Bottom pressure signals at the TAG deep-sea hydrothermal field : evidence for short-period, flow-induced ground deformation", Geophysical Research Letters 36 (2009): L19301, DOI:10.1029/2009GL040006, https://hdl.handle.net/1912/3384
Showing items related by title, author, creator and subject.
Rawson, Charles E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-06)Recent international and domestic regulatory actions have resulted in significant changes to oil tanker designs and intensified attention on predicting tanker environmental performance following groundings or collisions. ...
Measurements of the vertical water vapor transport and distribution within unstable atmospheric ground layers and the turbulent mass exchange coefficient Bunker, Andrew F. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1952-12)The series of observations described in this report were planned with the double purpose of measuring the evaporation and transport of water vapor from the ocean into an unstable atmosphere, and of studying the diffusion ...
Measurements of 220Rn and 222Rn and CO2 emissions in soil and fumarole gases on Mt. Etna volcano (Italy) : implications for gas transport and shallow ground fracture Giammanco, S.; Sims, Kenneth W. W.; Neri, M. (American Geophysical Union, 2007-10-04)Measurements of 220Rn and 222Rn activity and of CO2 flux in soil and fumaroles were carried out on Mount Etna volcano in 2005–2006, both in its summit area and along active faults on its flanks. We observe an empirical ...