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Latest Structure of the Earth Stories

2009-07-30 10:25:11

Researchers aboard drilling vessel Chikyu report successful completion of first riser-drilling operations in earthquake zone.Kumano Basin off Kii Peninsula, approximately 58 km southeast of Japan"” Despite harsh weather and ocean conditions, and complex geological characteristics of its drill site, the deep-sea drilling vessel CHIKYU, for the first time in the history of scientific ocean drilling, conducted riser-drilling operations to drill successfully down to a depth of 1,603.7...

2009-06-22 11:50:00

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...

2009-06-18 09:10:49

U.S. scientists have used a supercomputer to calculate the iron isotope distribution in Earth's mantle that occurred 4.5 billion years ago. University of California-Davis geochemists said they simulated the conditions that would have existed when the Earth crystallized from an ocean of magma to its solid form, producing the first picture of how different isotopes of iron were initially distributed in the solid Earth. The scientists said their research could result in a wave of investigations...

2009-06-18 08:29:58

For the first time scientists have discovered the presence of a natural deep earth pump that is a crucial element in the formation of ore deposits and earthquakes.The process, called creep cavitation, involves fluid being pumped through pores in deformed rock in mid-crustal sheer zones, which are approximately 15 km below the Earth's surface.The fluid transfer through the middle crust also plays a key role in tectonic plate movement and mantle degassing.The discovery was made by examining one...

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2009-06-15 14:40:00

UC Davis team calculates distribution of iron isotopes in Earth's mantle 4.5 billion years ago, opening door to new studies of planet's geologic historyBy using a super-computer to virtually squeeze and heat iron-bearing minerals under conditions that would have existed when the Earth crystallized from an ocean of magma to its solid form 4.5 billion years ago, two UC Davis geochemists have produced the first picture of how different isotopes of iron were initially distributed in the solid...

2009-05-28 11:07:43

 A new analysis of the processes that constantly stir the Earth's deep mantle is helping to explain how the mantle holds onto a portion of ancient noble gases that were trapped during the Earth's formation.The research, which appears this week in the journal Nature, takes aim at a question that has vexed geoscientists for years: how to reconcile leading theories about the convection of Earth's mantle with observations of ancient noble gases in volcanic rocks. Researchers at Rice...

2009-05-27 15:56:08

Arizona State University researchers say they have discovered a large cylindrical blob of cold material far below the surface of central Nevada. Led by geologist John West, the scientists determined the blob was formed when portions of the lithosphere -- the Earth's crust and uppermost mantle -- had sunk into the more fluid upper mantle beneath the U.S. Western Great Basin. West said it was an extremely unexpected finding in a location that showed no corresponding changes in surface...

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2009-05-26 15:30:00

There are very few places in the world where dynamic activity taking place beneath Earth's surface goes undetected. Volcanoes, earthquakes, and even the sudden uplifting or sinking of the ground are all visible results of restlessness far below, but according to research by Arizona State University (ASU) seismologists, dynamic activity deep beneath us isn't always expressed on the surface. The Great Basin in the western United States is a desert region largely devoid of major surface changes....

2009-05-01 08:23:11

The drillship JOIDES Resolution ("JR") has returned to international operations, and will make a port call in Honolulu, Hawaii, May 5-9, 2009.When it arrives, an international team of scientists studying seafloor sediments will have completed the first of two nine-week Integrated Ocean Drilling Program (IODP) expeditions to the equatorial Pacific Ocean.After more than two years of rebuilding, the JR has new capabilities that include an upgraded sub-sea camera system, improved core handling...

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2009-03-31 08:29:35

New spin on laser-flash analysis Putting a new spin on an old technique, Anne M. Hofmeister, Ph.D., research professor of earth and planetary sciences in Arts & Sciences at Washington University in St. Louis, has revolutionized scientists' understanding of heat transport in the Earth's crust, the outermost solid shell of our planet. Temperature is an important driver of many geological processes, including the generation of magmas (molten rocks) in the deepest parts of the Earth's crust,...


Latest Structure of the Earth Reference Libraries

Seismology
2014-01-12 00:00:00

Seismology is the scientific study of earthquakes and the spread of elastic waves through the Earth or through other planet-like bodies. The field includes studies of earthquake effects, such as tsunamis in addition to diverse seismic sources such as tectonic, volcanic, oceanic, atmospheric, and artificial processes. A related field that utilizes geology to infer information regarding past earthquakes is paleoseismology. A recording of earth motion as a function of time is a seismogram. A...

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2014-01-12 00:00:00

Earth science (or geoscience) is the science of the planet Earth. Earth science can be broken down into four major disciplines, which are: geography, geology, geophysics, and geodesy. These disciplines use physics, chemistry, biology, chronology and mathematics to arrive to a greater understanding of the principal areas of the Earth system. Since Earth is the only known life-bearing planet, Earth science is solely dedicated to the geophysical makeup of our own planet. One discipline,...

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2004-10-19 04:45:41

Meteorite -- A meteorite is a relatively small extraterrestrial material body that reaches the Earth's surface. While in space these bodies are called meteoroids. Upon entering the atmosphere air drag and friction will cause the body to heat up, emitting light, thus forming a meteor, fireball, or shooting star. Most meteors disintegrate in the air, making impact events (Earth impacts) on the surface of Earth uncommon. About 500 baseball sized rocks a year reach the surface. Large...

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2004-10-19 04:45:40

Earth -- in geology and astronomy, fifth largest planet of the solar system and the only planet definitely known to support life. Gravitational forces have molded the earth, like all celestial bodies, into a spherical shape. However, the earth is not an exact sphere, being slightly flattened at the poles and bulging at the equator. The equatorial diameter is c.7,926 mi (12,760 km) and the polar diameter 7,900 mi (12,720 km); the circumference at the equator is c.24,830 mi (40,000 km)....

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Word of the Day
omphalos
  • The navel or umbilicus.
  • In Greek archaeology: A central boss, as on a shield, a bowl, etc.
  • A sacred stone in the temple of Apollo at Delphi, believed by the Greeks to mark the 'navel' or exact center-point of the earth.
'Omphalos' comes from the ancient Greek.
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