Ocean‐bottom ultralow‐frequency (ULF) seismo‐acoustic ambient noise: 0.002 to 0.4 Hz
作者:
George H. Sutton,
Noël Barstow,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1990)
卷期:
Volume 87,
issue 5
页码: 2005-2012
ISSN:0001-4966
年代: 1990
DOI:10.1121/1.399328
出版商: Acoustical Society of America
关键词: SEA BED;NOISE;MILLI HZ RANGE;HYDROPHONES;SEISMIC WAVES;PACIFIC OCEAN;STORMS
数据来源: AIP
摘要:
Observed spatial and temporal characteristics of ultralow‐frequency (ULF) ocean‐bottom seismo‐acoustic ambient noise are required in order to construct realistic quantitative predictive models of the phenomena involved. Few such data exist or have been studied, especially for frequencies below about 0.1 Hz. Analysis of noise data is presented in the band 0.002 to 0.4 Hz from a 2‐week period, 11/28–12/12/67, recorded from long‐period, three‐component seismometers and a hydrophone of the Columbia‐Point Arena ocean‐bottom seismic station (OBSS, 38° 09.2’N–124° 54.4’W, 3903‐m depth). Two intense NE Pacific storms with hurricane force winds occurred during the emphasized time period. Time variations of spectra and of amplitude and phase coherencies of the four‐component OBSS data are related to the storm histories and to local weather/wave conditions and are used to identify motion (seismic wave) types and directions of propagation.
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