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 28, 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 28, 2014).

Share This




More Earth & Climate News

Monday, July 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Sea Turtle Hatchlings Emerge from Nest

Raw: Sea Turtle Hatchlings Emerge from Nest

AP (July 27, 2014) — A live-streaming webcam catches loggerhead sea turtle hatchlings emerging from a nest in the Florida Keys. (July 27) Video provided by AP
Powered by NewsLook.com
Trees Could Save More Than 850 Lives Each Year

Trees Could Save More Than 850 Lives Each Year

Newsy (July 27, 2014) — A national study conducted by the USDA Forest Service found that trees collectively save more than 850 lives on an annual basis. Video provided by Newsy
Powered by NewsLook.com
Phoenix Thunderstorm Creates Giant Wall of Dust

Phoenix Thunderstorm Creates Giant Wall of Dust

Reuters - US Online Video (July 26, 2014) — A giant wall of dust slowly moves north over the Phoenix area after a summer monsoon thunderstorm. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Rare Lemur Among Baby Animals Debuted at Cleveland Zoo

Rare Lemur Among Baby Animals Debuted at Cleveland Zoo

Reuters - US Online Video (July 26, 2014) — A rare baby Lemur is among several baby animals getting their public debut at a Cleveland zoo. Mana Rabiee 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