Featured Research

from universities, journals, and other organizations

Acoustic Noise Contains Valuable Geophysical Information

Date:
December 8, 2006
Source:
Delft University of Technology
Summary:
The proper processing of acoustic noise can provide a wealth of geophysical information. The advantage of using existing acoustic noise is that signals only need to be recorded and not produced. Researchers at TU Delft and the Colorado School of Mines have generalised the underlying theory and found that acoustic noise can be used for a much wider scale of physical applications than was previously thought possible.

The proper processing of acoustic noise can provide a wealth of information. Geophysicists have used seismic background noise measurements to reconstruct the crustal structure under Southern California. The advantage of using existing acoustic noise is that signals only need to be recorded and not produced.

Related Articles


Researchers at TU Delft and the Colorado School of Mines have generalised the underlying theory and found that acoustic noise can be used for a much wider scale of physical applications than was previously thought possible. The researchers will publish their findings in Physical Review Letters on 8 December 2006.

As acoustic noise travels through a medium, such as the earth's crust, it compiles information. In recent years it was discovered that only a few simple processes (cross-correlation) were needed to extract a meaningful signal from acoustic noise.

Geophysicists Kees Wapenaar and Evert Slob of TU Delft, and Roel Snieder of the Colorado School of Mines, have now developed a unified theory that extends the extraction of impulse responses from background noise for more general situations. This theory includes electromagnetic noise in conducting media, acoustic noise in flowing and viscous media, and even diffusive transport phenomena. Moreover, the theory predicts that coupled processes, such as seismo-electric effect and the associated electrokinetic reflections, can also be retrieved from the background noise measurements.

It appears that background noise contains more information than one could possibly dream of several years ago. The theory can be used for 'remote sensing without a source' for a wide range of physical applications that include the determination of parameters of flowing media, viscous media, as well as the electrokinetic coupling parameters of porous reservoir rock. In partnership with Shell, the researchers have since created seismic reflection data from background noise that was recorded in a desert in the Middle East. Moreover, they expect their research methods to be applied in, for example, the LOFAR-project.


Story Source:

The above story is based on materials provided by Delft University of Technology. Note: Materials may be edited for content and length.


Cite This Page:

Delft University of Technology. "Acoustic Noise Contains Valuable Geophysical Information." ScienceDaily. ScienceDaily, 8 December 2006. <www.sciencedaily.com/releases/2006/12/061207161055.htm>.
Delft University of Technology. (2006, December 8). Acoustic Noise Contains Valuable Geophysical Information. ScienceDaily. Retrieved December 22, 2014 from www.sciencedaily.com/releases/2006/12/061207161055.htm
Delft University of Technology. "Acoustic Noise Contains Valuable Geophysical Information." ScienceDaily. www.sciencedaily.com/releases/2006/12/061207161055.htm (accessed December 22, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Monday, December 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Touch-Free Smart Phone Empowers Mobility-Impaired

Touch-Free Smart Phone Empowers Mobility-Impaired

Reuters - Innovations Video Online (Dec. 21, 2014) A touch-free phone developed in Israel enables the mobility-impaired to operate smart phones with just a movement of the head. Suzannah Butcher reports. Video provided by Reuters
Powered by NewsLook.com
Building Google Into Cars

Building Google Into Cars

Reuters - Business Video Online (Dec. 19, 2014) Google's next Android version could become the standard that'll power your vehicle's entertainment and navigation features, Reuters has learned. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
AP Review: Nikon D750 and GoPro Hero 4

AP Review: Nikon D750 and GoPro Hero 4

AP (Dec. 19, 2014) What to buy an experienced photographer or video shooter? There is some strong gear on the market from Nikon and GoPro. The AP's Ron Harris takes a closer look. (Dec. 19) Video provided by AP
Powered by NewsLook.com
Obama: Better Ways to Create Jobs Than Keystone Pipeline

Obama: Better Ways to Create Jobs Than Keystone Pipeline

AFP (Dec. 19, 2014) US President Barack Obama says that construction of the Keystone pipeline would have 'very little impact' on US gas prices and believes there are 'more direct ways' to create construction jobs. Duration: 00:47 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


Space & Time

Matter & Energy

Computers & Math

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