Underwater 20‐Hz Signals Recorded near Midway Island
作者:
John Northrop,
William C. Cummings,
Michael F. Morrison,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1971)
卷期:
Volume 49,
issue 6B
页码: 1909-1910
ISSN:0001-4966
年代: 1971
DOI:10.1121/1.1912606
出版商: Acoustical Society of America
数据来源: AIP
摘要:
From time to time, strong underwater acoustic signals with frequencies near 20 Hz have been recorded from hydrophones in nearly all oceans. Further details, such as source level, waveform, and movement, are not so well known. These signals may be divided into two main classes: short (∼1 sec) and long (up to 35 sec) emissions of sound at or near 20 Hz. We describe some low‐frequency long signals that were recorded on hydrophones near Midway Island, thus providing a further example of these interesting phenomena. The slow (∼1 knot) meandering of the source, its relatively high signal level (∼70 dBre1 dyn/cm2at 1 yd) and low frequency (23–25 Hz) suggest a large biological source.
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