Acoustic noise measurements on Axial Seamount, Juan De Fuca Ridge

Anomalously high ambient acoustic noise was observed within the caldera of Axial Seamount, located on the Juan de Fuca Ridge at 46°N. Noise spectra from 2 to 30 Hz were calculated from hydrophone signals from four separate seismic recording systems. Noise levels varied up to 25 dB over 6 km. This ob...

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Bibliographic Details
Published inGeophysical research letters Vol. 13; no. 9; pp. 957 - 960
Main Authors Bibee, L. D., Jacobson, R. S.
Format Journal Article
LanguageEnglish
Published Blackwell Publishing Ltd 01.09.1986
Subjects
Acoustic noise
Calderas
Noise
Noise levels
Ridges
Seamounts
Submersibles
Vents
INE, Pacific, Juan de Fuca Ridge
INE, Pacific, Juan de Fuca Ridge, Axial Seamount
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Summary:Anomalously high ambient acoustic noise was observed within the caldera of Axial Seamount, located on the Juan de Fuca Ridge at 46°N. Noise spectra from 2 to 30 Hz were calculated from hydrophone signals from four separate seismic recording systems. Noise levels varied up to 25 dB over 6 km. This observation suggests the noise source is at or near the sea floor. By assuming spherical spreading, we estimate the source of the noise to be within 400 m of one of the instruments. A low temperature hydrothermal vent field, located within 600 m of this instrument, has been previously mapped with submersibles and is likely the source of the anomalous noise. A high temperature, black smoker, vent field, also located within the caldera, shows no evidence of anomalous acoustic noise.
Bibliography:ark:/67375/WNG-RM9XTN6G-W
ArticleID:6L7012
istex:4AA8010D0658820B37B1B4D5172A4BCAC0FA18CA
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0094-8276
1944-8007
DOI:10.1029/GL013i009p00957