Trends in low‐frequency deep ocean ambient noise levels: New results from old data.

2010 ◽  
Vol 127 (3) ◽  
pp. 1782-1782 ◽  
Author(s):  
Ross Chapman ◽  
Andrea Price
Keyword(s):  
Ambient Noise ◽  
Low Frequency ◽  
Deep Ocean ◽  
Noise Levels

scholarly journals MobiLab – A Mobile Laboratory for On-Site Listening Experiments in Virtual Acoustic Environments

2019 ◽  
Vol 105 (5) ◽  
pp. 875-887
Author(s):  
Florian Pausch ◽  
Janina Fels
Keyword(s):  
Ambient Noise ◽  
Low Frequency ◽  
Mobile Laboratory ◽  
Noise Levels ◽  
Acoustic Parameters ◽  
Research Areas ◽  
Test Conditions ◽  
Acoustic Environments ◽  
Study Participants ◽  
Insulation Performance

Virtual acoustic environments have demonstrated their versatility for conducting studies in various research areas as they allow easy manipulations of experimental test conditions or simulated acoustic scenes, while providing expansion possibilities to related interdisciplinary and multimodal fields. Although the evolution of auditory and cognitive models is consistently pursued, listening experiments are still considered the gold standard, usually necessitating a large amount of resources, including travel expenses of study participants. In order to facilitate practical and efficient study execution, we therefore implemented a mobile hearing laboratory by acoustically optimising the interior of a caravan. All necessary technical facilities were integrated to perform listening experiments in virtual acoustic environments under controlled conditions directly on site, for example, in front of schools or senior residential centers. The design and construction of this laboratory are presented and evaluated based on insulation properties, selected room acoustic parameters, and interior ambient noise levels that are to be expected during operation at representative test sites. Limitations, particularly in low-frequency insulation performance, should provide incentives for further optimisations in similar future projects.

scholarly journals Spatial Vertical Directionality and Correlation of Low-Frequency Ambient Noise in Deep Ocean Direct-Arrival Zones

Sensors ◽  
2018 ◽  
Vol 18 (2) ◽  
pp. 319 ◽  
Author(s):  
Qiulong Yang ◽  
Kunde Yang ◽  
Ran Cao ◽  
Shunli Duan
Keyword(s):  
Ambient Noise ◽  
Low Frequency ◽  
Deep Ocean

Wind-dependence of low-frequency ambient noise in the deep-ocean sound channel

2013 ◽  
Vol 133 (5) ◽  
pp. 3396-3396
Author(s):  
Stephen Nichols ◽  
David L. Bradley
Keyword(s):  
Ambient Noise ◽  
Low Frequency ◽  
Deep Ocean ◽  
Sound Channel

First noise and teleseismic recordings on a new ocean bottom seismometer capsule

1984 ◽  
Vol 74 (3) ◽  
pp. 1043-1058
Author(s):  
William A. Prothero ◽  
William Schaecher
Keyword(s):  
Sea Water ◽  
Low Frequency ◽  
Deep Ocean ◽  
Ocean Bottom ◽  
Ocean Bottom Seismometer ◽  
Data Logging ◽  
Santa Barbara Channel ◽  
Noise Levels ◽  
Santa Barbara ◽  
Recording Time

Abstract An ocean bottom seismometer capsule designed specifically for the long-term monitoring of teleseisms has been designed and tested. An efficient triggering algorithm consisting of multiple high-pass filters effectively discriminates between locally generated earthquakes and noise, and teleseisms. During a 1-month deep ocean deployment west of the Santa Barbara Channel, a magnitude 5.9 earthquake at a distance of 76° was recorded, in addition to a number of regional events in the 300- to 450-km range. Noise levels were monitored by automatically recording data at intervals. Vertical noise levels were approximately 20 times greater than those recorded at quiet land sites, and horizontal noise levels were about 5 times greater than that. The instrument consists of a microprocessor-controlled data logging system in three parallel pressure tubes, joined by a common baseplate. Wires between the three tubes are contained within the baseplate. There are no external connectors which are exposed to sea water, allowing the deployment time to extend to 1 yr. Data are recorded on two Braemar cassette recorders with a capacity of 15 Mbits each, for a continuous recording time of approximately 43 hr. This is adequate for the expected data acquisition rate, given the robustness of the triggering algorithm. The sensors are Mark Products L4-C 1-Hz seismometers with useful extended low-frequency response to about 30-sec periods for earthquake signals. The three components are leveled with a mechanical gimbal arrangement. The instrument has been successfully deployed 3 times in the Santa Barbara Channel and deep ocean, and should prove extremely useful for extending teleseismic studies into the ocean.

Effect of COVID-19 spring lockdown on low-frequency ambient noise levels along the Brittany coast

2021 ◽  
Vol 149 (4) ◽  
pp. A87-A87
Author(s):  
Delphine Mathias ◽  
Julien Bonnel ◽  
Laurent Chauvaud
Keyword(s):  
Ambient Noise ◽  
Low Frequency ◽  
Noise Levels
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