Acoustic detection of a seafloor spreading episode on the Juan de Fuca Ridge using military hydrophone arrays

Details Acoustic detection of a seafloor spreading episode on the Juan de Fuca Ridge using military hydrophone arrays Acoustic detection of a seafloor spreading episode on the Juan de Fuca Ridge using military hydrophone arrays

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..131f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 2, p. 131-134

Computer Science

Sound

70

Hydrophones, Mid-Ocean Ridges, Ocean Bottom, Pacific Ocean, Sea Floor Spreading, Seismology, Sound Detecting And Ranging, Lava, Plumes, Ships

Scientific paper

Until recently, no practical method has been available to continuously monitor seismicity of seafloor spreading centers. The availability of the U.S. Navy's SOund SUrveillance System (SOSUS) for environmental research has allowed the continuous monitoring of low-level seismicity of the Juan de Fuca Ridge in the northeast Pacific. On June 22, 1993, NOAA installed a prototype system at U.S Naval Facility Whidbey Island to allow real-time acoustic monitoring of the Juan de Fuca Ridge using SOSUS. On June 26, 2145 GMT, a burst of low-level seismic activity, with accompanying harmonic tremor, was observed and subsequently located near 46 deg 15 min N, 129 deg 53 min W, on the spreading axis of the Juan de Fuca Ridge. Over the following 2 days, the activity migrated to the NNE along the spreading axis with the final locus of activity near 46 deg 31.5 min N, 129 deg 35 min W. The nature of the seismicity was interpreted to represent a lateral dike injection with the possibility of eruption on the seafloor. Based on this interpretation, a response effort was initated by U.S. and Canadian research vessels, and both warm water plumes and fresh lavas were subsequently identified at the site.

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