Infrasonic seismic and acoustic measurements in the deep ocean

Author

Adair, Richard G. ; Orcutt, J.A. ; Farrell, William E.

Author_Institution

Scripps Inst. of Oceanogr., California Univ., San Diego, CA, USA

Volume

13

Issue

4

fYear

1988

fDate

10/1/1988 12:00:00 AM

Firstpage

245

Lastpage

253

Abstract

The authors compare the signal-to-noise ratios obtained on bottomed seismometers, bottomed hydrophones, and buried seismometers from near-surface explosions in the Ngendei Expedition. The data were recorded in 5.5-km-deep water in the south central Pacific Ocean with a triaxial borehole seismograph and four triaxial ocean-bottom seismographs having externally mounted hydrophones. At ranges less than 35 km, the data indicate that the ocean bottom seismometer is a superior signal detector than the ocean-bottom hydrophone, and that the subbottom seismometer is superior in performance to the ocean-bottom seismometer. Above 4 Hz, the seismometer appears to have a 10-dB signal-to-noise advantage over the hydrophone for surface explosions at ranges less than 30 km

Keywords

geophysical prospecting; geophysical techniques; oceanographic techniques; seismology; underwater sound; 5.5 km; Ngendei Expedition; acoustic measurements; deep ocean; hydrophones; infrasonic; near-surface explosions; oceanographic techniques; prospecting method; seismometers; south central Pacific Ocean; triaxial borehole seismograph; underwater sound; Acoustic measurements; Explosions; Noise level; Oceans; Sea floor; Sea surface; Sensor phenomena and characterization; Signal to noise ratio; Sonar equipment; Working environment noise;

fLanguage

English

Journal_Title

Oceanic Engineering, IEEE Journal of

Publisher

ieee

ISSN

0364-9059

Type

jour

DOI

10.1109/48.9237

Filename

9237