Mid-basin deep-water low-frequency ambient noise estimation

2012 ◽  
Author(s):  
William M. Carey ◽  
Richard B. Evans
Keyword(s):  
Deep Water ◽  
Ambient Noise ◽  
Low Frequency ◽  
Noise Estimation

Mid‐basin deep‐water low‐frequency ambient noise estimation.

2011 ◽  
Vol 129 (4) ◽  
pp. 2366-2366
Author(s):  
William M. Carey ◽  
Richard B. Evans
Keyword(s):  
Deep Water ◽  
Ambient Noise ◽  
Low Frequency ◽  
Noise Estimation

Deep Water Ambient Noise and Mode Processing

2012 ◽  
Author(s):  
Kathleen E. Wage
Keyword(s):  
Deep Water ◽  
Ambient Noise

Deep Water Ambient Noise and Mode Processing

2014 ◽  
Author(s):  
Kathleen E. Wage
Keyword(s):  
Deep Water ◽  
Ambient Noise

Meteorological conditions influence on quantification of site effects at low frequency using the seismic ambient noise

2015 ◽  
Author(s):  
Rabah Bensalem* ◽  
Djamal Machane ◽  
Jean-Luc Chatelain ◽  
Mohamed Djeddi ◽  
Hakim Moulouel ◽  
...  
Keyword(s):  
Site Effects ◽  
Ambient Noise ◽  
Low Frequency ◽  
Meteorological Conditions ◽  
Seismic Ambient Noise

scholarly journals Detection of infrasound by the Atlantic cod

1986 ◽  
Vol 125 (1) ◽  
pp. 197-204 ◽  
Author(s):  
O. Sand ◽  
H. E. Karlsen
Keyword(s):  
Ambient Noise ◽  
Atlantic Cod ◽  
Low Frequency ◽  
Directional Pattern ◽  
Frequency Noise ◽  
Threshold Values ◽  
Sensory Inputs ◽  
A Value ◽  
Cardiac Conditioning ◽  
Lower Frequencies

Below about 50 kHz the level of ambient noise in the sea increases continuously towards lower frequencies. In the infrasound range the spectral slope is particularly steep. This low-frequency noise may propagate long distances with little attenuation, causing a directional pattern of infrasound in the sea. Using a standing-wave acoustic tube, we have studied the sensitivity of cod to infrasound down to 0.1 Hz by means of the cardiac conditioning technique. The threshold values, measured as particle acceleration, showed a steady decline towards lower frequencies below 10 Hz, reaching a value close to 10(−5)ms-2 at 0.1 Hz. The spectrum level at 0.1 Hz in the sea ranges between 120 and 180 dB (re 1 microPa), with corresponding particle accelerations from less than 10(−6) to more than 10(−4)ms-2. The sensitivity of cod is thus sufficient to detect the highest levels of ambient infrasound, and we put forward the hypothesis that fish may utilize information about the infrasound pattern in the sea for orientation during migration, probably in addition to an array of other sensory inputs.

Spectrum Analysis of Deep Water Ambient Noise in the West Pacific

2021 ◽  
Author(s):  
Jiahua Zhu ◽  
Wei Guo ◽  
Bingbing Zhang ◽  
Yanxin Ma ◽  
Yangyang Chen ◽  
...  
Keyword(s):  
Deep Water ◽  
Spectrum Analysis ◽  
Ambient Noise ◽  
The West ◽  
West Pacific

Low Frequency Wind Generated Ambient Noise in Shallow Water

1988 ◽  
pp. 273-280
Author(s):  
Henrik Schmidt ◽  
Tuncay Akal ◽  
W. A. Kuperman
Keyword(s):  
Shallow Water ◽  
Ambient Noise ◽  
Low Frequency

scholarly journals Low‐Frequency Ambient Noise Autocorrelations: Waveforms and Normal Modes

2018 ◽  
Vol 89 (4) ◽  
pp. 1488-1496 ◽  
Author(s):  
M. Schimmel ◽  
E. Stutzmann ◽  
S. Ventosa
Keyword(s):  
Ambient Noise ◽  
Normal Modes ◽  
Low Frequency
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