Featured Research

from universities, journals, and other organizations

Earth Hotspot Poorly Imaged

Date:
July 13, 2009
Source:
NWO (Netherlands Organization for Scientific Research)
Summary:
The Earth's mantle, situated under the Earth's crust, is very much the spot for studying interesting geological processes. Although we do not realize it, right under our feet there is a sultry world of circulating Earth layers. We only come into contact with these hot Earth layers in the event of earthquakes and volcanic eruptions.

The Earth's mantle, situated under the Earth's crust, is very much the spot for studying interesting geological processes. Although we do not realise it, right under our feet there is a sultry world of circulating Earth layers. We only come into contact with these hot Earth layers in the event of earthquakes and volcanic eruptions. It is therefore important to learn more about the characteristics of the Earth's mantle.

These characteristics can be portrayed using seismic waves. However, the techniques used for this purpose still have various shortcomings. Dutch-sponsored research Ebru Bozdag demonstrated this during her doctoral research.

Seismic waves are frequently used to image the Earth's mantle. They are generated by earthquakes and registered with measuring equipment. Subsequently the characteristics of the seismic waves are converted into an image of the geological structure of the layer. Bozdag used 3D-simulations of seismic waves to test the reliability of these images. She specifically focused on tomographic images. These are the images where the mantle is portrayed in a 3D cross-section. The mantle tomography techniques currently used are still far from perfect.

Shocking imperfections

As measurements of the mantle are influenced by the Earth's crust above, the data are corrected for this. However, Bozdag's research revealed that due to inaccuracies this correction can still lead to erroneous data and consequently an incorrect interpretation of the measurements. The outcome is a wrong representation of the mantle. The imperfections demonstrated for the crust layer are shocking. Characteristics previously attributed to the mantle now appear to be merely the result of these wrong corrections. Thanks to new computer facilities, Bozdag is the first to have demonstrated these problems using simulations.

The problems can be alleviated by no longer correcting for the crust but by measuring both the mantle and the crust and by using 3D wave simulations as a control tool. These techniques are not only suitable for studying the Earth's mantle but can also be used on a smaller scale. Obtaining an accurate picture of the Earth's structure is vitally important. Besides providing insights into the geological evolution of the Earth, it also provides more information about the development of earthquakes.

Bozdag's research took place within the SPICE project of the European Union and the NWO Vici project 'Quantitative Seismology: Toward a New Understanding of Earth's Deep Interior'.

Bozdag shall continue this line of research during a postdoc at Princeton University, where she wants to focus on on the Marmara region in Turkey, a risk area for earthquakes.


Story Source:

The above story is based on materials provided by NWO (Netherlands Organization for Scientific Research). Note: Materials may be edited for content and length.


Cite This Page:

NWO (Netherlands Organization for Scientific Research). "Earth Hotspot Poorly Imaged." ScienceDaily. ScienceDaily, 13 July 2009. <www.sciencedaily.com/releases/2009/06/090622194340.htm>.
NWO (Netherlands Organization for Scientific Research). (2009, July 13). Earth Hotspot Poorly Imaged. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2009/06/090622194340.htm
NWO (Netherlands Organization for Scientific Research). "Earth Hotspot Poorly Imaged." ScienceDaily. www.sciencedaily.com/releases/2009/06/090622194340.htm (accessed July 25, 2014).

Share This




More Earth & Climate News

Friday, July 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Goma Cheese Brings Whiff of New Hope to DRC

Goma Cheese Brings Whiff of New Hope to DRC

Reuters - Business Video Online (July 24, 2014) — The eastern region of the Democratic Republic of Congo, mainly known for conflict and instability, is an unlikely place for the production of fine cheese. But a farm in the village of Masisi, in North Kivu is slowly transforming perceptions of the area. Known simply as Goma cheese, the Congolese version of Dutch gouda has gained popularity through out the region. Ciara Sutton reports. Video provided by Reuters
Powered by NewsLook.com
Bill Gates: Health, Agriculture Key to Africa's Development

Bill Gates: Health, Agriculture Key to Africa's Development

AFP (July 24, 2014) — Health and agriculture development are key if African countries are to overcome poverty and grow, US software billionaire Bill Gates said Thursday, as he received an honourary degree in Ethiopia. Duration: 00:36 Video provided by AFP
Powered by NewsLook.com
Higgins Breaks Record at Mt. Washington

Higgins Breaks Record at Mt. Washington

Driving Sports (July 24, 2014) — Subaru Rally Team USA drivers David Higgins and Travis Pastrana face off against a global contingent of racers at the annual Mt. Washington Hillclimb in New Hampshire. Includes exclusive in-car footage from Higgins' record attempt. Video provided by Driving Sports
Powered by NewsLook.com
Storm Kills Three, Injures 20 at Virginia Campground

Storm Kills Three, Injures 20 at Virginia Campground

Reuters - US Online Video (July 24, 2014) — A likely tornado tears through an eastern Virginia campground, killing three and injuring at least 20. Linda So reports. Video provided by Reuters
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:
from the past week

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