Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

NASA and USGS magnetic database ’rocks’ the world

19.05.2004


Band Iron Formations

These Band Iron formations are precambrian sedimentary rocks. They are highly magnetic. Band Iron Formations like this one were responsible for prominent variations in Earth’s magnetic field, like the Kursk Magnetic Anomaly that was remotely sensed by satellites. Kursk is located in western Russia, at the confluence of the Seym and Tuskar rivers. Credit: Photo courtesy of P.Hoffman


Lithospheric Magnetic Anomalies

This image shows variations in magnetic fields in the upper layer of Earth’s surface known as the lithosphere. The data were acquired by satellites passing over at an altitude of 400 km. The satellite data were run through a model to produce this image. The units are in nanoteslas, the common unit for measuring magnetic fields. The color bar indicates areas with positive and negative magnetic fields. Credit: Terrence Sabaka et al./NASA GSFC


NASA and the United States Geological Survey (USGS) are teaming up to create one of the most complete databases of magnetic properties of Earth’s rocks ever assembled. The partnership demonstrates ongoing interagency collaboration.

Satellite data of Earth’s magnetic field combined with rock magnetic data collected on the ground will provide more complete insight into Earth’s geology, gravity and magnetism.

Satellites, including NASA’s Magsat, have detected magnetic signals in the upper layer of the Earth, called the lithosphere. With over 36,000 rock samples, the combined database will help researchers determine the origin of these signals in Earth’s crust.



The database will be available to the public via the Internet. A clickable map of the world will include locations where detailed rock magnetic data were collected.

Open access to specific properties and locations of each type of rock will allow researchers to more accurately model Earth’s gravity and magnetic fields. This should improve our understanding of the structure and development of Earth’s crust.

“The information in this database will allow more realistic interpretations of satellite magnetic data and will contribute to a variety of studies such as groundwater, mineral resource, and earthquake hazard investigations,” said Katherine Nazarova, a researcher at NASA Goddard Space Flight Center (GSFC) who is coordinating the collaborative effort with Jonathan Glen from the USGS.

The NASA GSFC database contains magnetic properties of 19,000 samples. The samples come from all over the world including the Ukrainian and Baltic shields, Kamchatka, the Ural Mountains and Iceland.

2000 Icelandic rocks in the database have helped explain the source of unusual magnetic activity in Iceland recorded by both Magsat and German Champ missions. Database records revealed the magnetic shifts in Iceland were caused by ferrobasalts, analogues to Martian rocks. As researchers continue to study Mars, these findings may shed light on Mars’ geology.

The USGS database contains rock densities and magnetic properties for some 17,000 entries. Many of these data were taken from surface outcrops in the Western U.S. They span a broad range of rock types.

Researchers collect rock specimens and data in a variety of ways. Research vessels are used to dredge samples from the ocean floor. Ships may also carry huge deep-sea drills that pull cores of sediment and rock from the beneath the ocean. The database includes rock magnetic data from the deepest borehole in the world. It was drilled in northern Russia in the Baltic Shield. Researchers drilled and extracted cores from the continental crust as deep as 12.26 kilometers (7.62 miles).

On land, scientists may collect samples from rock outcrops. When rocks have been exposed to the elements, researchers use small hand drills to uncover fresh material under a rock’s surface.

Satellites that have detected unexplained variations in Earth’s magnetic field include NASA’s Magsat and Polar Orbiting Geophysical Observatory, Germany’s Champ satellite, and the Danish Oersted satellite.

The combined USGS and GSFC databases and future updates will eventually be available and maintained through the National Oceanic and Atmospheric Administration at the World Data Center A in Boulder, Colorado.

Nazarova will present a poster describing the database at the 2004 Joint Assembly of the American Geophysical Union taking place this week in Montreal, Canada.

The mission of NASA’s Earth Science Enterprise is to develop a scientific understanding of the Earth System and its response to natural or human-induced changes to enable improved prediction capability for climate, weather, and natural hazards.

Krishna Ramanujan | GSFC
Further information:
http://www.gsfc.nasa.gov/topstory/2004/0517magnet.html

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Color effects from transparent 3D-printed nanostructures

New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference

Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...

Im Focus: Unraveling the nature of 'whistlers' from space in the lab

A new study sheds light on how ultralow frequency radio waves and plasmas interact

Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...

Im Focus: New interactive machine learning tool makes car designs more aerodynamic

Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.

When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...

Im Focus: Robots as 'pump attendants': TU Graz develops robot-controlled rapid charging system for e-vehicles

Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.

Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....

Im Focus: The “TRiC” to folding actin

Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.

Actin is the most abundant protein in highly developed cells and has diverse functions in processes like cell stabilization, cell division and muscle...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

LaserForum 2018 deals with 3D production of components

17.08.2018 | Event News

Within reach of the Universe

08.08.2018 | Event News

A journey through the history of microscopy – new exhibition opens at the MDC

27.07.2018 | Event News

 
Latest News

Smallest transistor worldwide switches current with a single atom in solid electrolyte

17.08.2018 | Physics and Astronomy

Robots as Tools and Partners in Rehabilitation

17.08.2018 | Information Technology

Climate Impact Research in Hannover: Small Plants against Large Waves

17.08.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>