Featured Research

from universities, journals, and other organizations

Scientists investigate acoustics in Gulf of Mexico

Date:
May 14, 2010
Source:
Naval Research Laboratory
Summary:
Scientists from the Naval Research Laboratory recently completed an investigation of the acoustic properties of the deep seafloor in the Gulf of Mexico.

NRL scientists and R/V Cape Hatteras crew deploy DTAGS after it is outfitted with an aluminum landing plate that couples the sound energy generated by DTAGS directly into the seafloor. The large orange sphere is one of the floats used in the seafloor-mounted vertical hydrophone arrays, which listened to the sounds generated by DTAGS and their echoes off the seafloor.
Credit: Image courtesy of Naval Research Laboratory

Scientists from the Naval Research Laboratory at Stennis Space Center, MS, (NRL-SSC) and Washington, D.C., recently completed an investigation of the acoustic properties of the deep seafloor in the Gulf of Mexico.

Related Articles


Scientists on the cruise measured the effects of geologic faulting on the efficiency of acoustic wave propagation.

"Knowing the bottom loss-the amount of sound energy lost with each bounce off the bottom-affects how far away one can 'see' a target in the ocean using sound," said Dr. Warren Wood, a geophysicist in the Marine Geosciences Division at NRL-SSC. "What we are trying to determine with this experiment is to what extent the 'visibility' depends on the direction we are looking."

In stiff, well-consolidated sediments, sound waves traveling across the faults or cracks in the earth tend to propagate slower and with lower amplitude than waves traveling along the faults. The magnitude of this effect in soft, deep water sediments is not known.

To measure the amount of this effect (sediment anisotropy), the researchers introduced a sound and then listened with vertical arrays of hydrophones.

The sound the scientists measured was created by a unique piece of equipment called the Deep Towed Acoustics Geophysics System (DTAGS). DTAGS can produce ultra low frequency sounds (220-1000 Hz) in water thousands of meters deep. DTAGS can be towed or placed directly on the seafloor, generating transverse, as well as the more common longitudinal waves.

The investigative experiment was conducted in an area of the Gulf of Mexico where the faults have been extensively mapped and water averages 800-900 m deep.

The experiment's location was within a gas hydrate observatory run by the Gulf of Mexico Hydrates Research Consortium at the University of Mississippi.


Story Source:

The above story is based on materials provided by Naval Research Laboratory. Note: Materials may be edited for content and length.


Cite This Page:

Naval Research Laboratory. "Scientists investigate acoustics in Gulf of Mexico." ScienceDaily. ScienceDaily, 14 May 2010. <www.sciencedaily.com/releases/2010/05/100512112422.htm>.
Naval Research Laboratory. (2010, May 14). Scientists investigate acoustics in Gulf of Mexico. ScienceDaily. Retrieved April 21, 2015 from www.sciencedaily.com/releases/2010/05/100512112422.htm
Naval Research Laboratory. "Scientists investigate acoustics in Gulf of Mexico." ScienceDaily. www.sciencedaily.com/releases/2010/05/100512112422.htm (accessed April 21, 2015).

Share This


More From ScienceDaily



More Earth & Climate News

Tuesday, April 21, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Maine Storm Surge Sparks Power Explosions

Raw: Maine Storm Surge Sparks Power Explosions

AP (Apr. 21, 2015) — Police dash cam video shows a series of explosions along the beach in Maine as heavy storm surge soaked electrical transformers. (April 21) Video provided by AP
Powered by NewsLook.com
Searching For The Loch Ness Monster? Try Google Street View

Searching For The Loch Ness Monster? Try Google Street View

Newsy (Apr. 21, 2015) — For the anniversary of the notorious "Surgeon&apos;s Photo" of the Loch Ness monster, Google used Street View to let those online join the search. Video provided by Newsy
Powered by NewsLook.com
Going Ape: Sierra Leone Chimpanzees Hail Ebola Retreat

Going Ape: Sierra Leone Chimpanzees Hail Ebola Retreat

AFP (Apr. 21, 2015) — As money runs out at Tacugama Chimpanzee Sanctuary in Sierra Leone, around 85 chimps are facing homelessness. The centre closed when the Ebola epidemic was ravaging the country but now that closure is beginning to look permanent. Video provided by AFP
Powered by NewsLook.com
Solar Plane Completes 6th Leg of Quest to Circumnavigate Globe

Solar Plane Completes 6th Leg of Quest to Circumnavigate Globe

AFP (Apr. 21, 2015) — Solar Impulse 2 lands in the Chinese city of Nanjing, finishing the sixth stage of its landmark 12-leg quest to circumnavigate the globe powered only by the sun. Duration: 00:42 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins