All Articles Tagged As: seismic waves
 | For many people, Global Positioning System satellite technology is little more than a high-tech version of a traditional paper map. Used in automobile navigation systems and smart phones, GPS helps folks find their way around a new neighborhood or locate a nearby restaurant. But GPS is doing much, much more for researchers at the California Institute of Technology (Caltech): it's helping them find their way to a more complete understanding of Earth's interior structure. ...> Full Article |
By studying seismographs from the earthquake that hit Chile last February, Earth scientists at the Georgia Institute of Technology have found a statistically significant increase of microearthquakes in central California in the first few hours after the main shock. The observation provides an additional support that seismic waves from distant earthquakes could also trigger seismic events on the other side of the Earth.
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New research gives the first accurate estimate of how much faster the Earth's core is rotating compared to the rest of the planet.
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Using a diamond-anvil cell to recreate the high pressures deep within the earth, researchers at the California Institute of Technology have found unusual properties in an iron-rich magnesium- and iron-oxide mineral that may explain the existence of several ultra-low velocity zones at the core?mantle boundary. A paper about their findings was published in a recent issue of Geophysical Research Letters.
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 | The most detailed seismic images yet published of the Yellowstone supervolcano's plumbing shows a plume of hot and molten rock rising from the northwest at a depth of at least 410 miles, contradicting claims that there is no deep plume. A related University of Utah study indicates the banana-shaped magma chamber a few miles beneath Yellowstone is 20 percent larger than believed, so a future cataclysmic eruption could be larger than thought. ...> Full Article |
 | Earth scientists at Brown University have found strong evidence that the geological processes that lead to the formation of oceanic crust are not as uniformly passive as believed. The team found centers of dynamic upwelling in the shallow mantle beneath spreading centers on the seafloor. Findings are published in this week's Nature. ...> Full Article |
Propagation of earthquake waves within the Earth is not uniform. Experiments indicate that the velocity of shear waves in Earth's lower mantle between 660 and 2900 km depth is strongly dependent on the orientation of ferropericlase.
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New research shows that the great Indian Ocean earthquake that struck off the Indonesian island of Sumatra on the day after Christmas in 2004 set off tremors nearly 9,000 miles away in the San Andreas fault at Parkfield, Calif.
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 | Research team shatters two-second barrier, named finalists for Gordon Bell Prize at SC08 ...> Full Article |
 | A new observation of the very deepest part of the Earth, the solid inner core ...> Full Article |
Seismic 'stress meter' registered signs of quake 10 hours in advance
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 | The speed of seismic waves is a measure of stress in rocks during -- and possibly before -- earthquakes ...> Full Article |
Researchers have devised a technology that can distinguish mine collapses from other seismic activity.
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Scientists have measured interesting changes in the speed of seismic waves that preceded two small earthquakes by 10 and 2 hours.
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 | Seismologists have found seismic signals from a giant river of ice in Antarctica that make California's earthquake problem seem trivial. ...> Full Article |
 | Geologists have confirmed the discovery of Earth's inner, innermost core, and have created a three-dimensional model that describes the seismic anisotropy and texturing of iron crystals within the inner core. ...> Full Article |
 | Researchers have presented evidence that their theory about the core of the earth is correct. Among other applications, the findings may be of significance for our understanding of the cooling down of the earth, and of the stability of the earth's magnetic field. ...> Full Article |
 | Why do some earthquakes terminate along a fault, while others jump or step-over a gap to another fault? ...> Full Article |
An ANU seismologist whose work could help forecast the damage path of future earthquakes has been honoured by one of the world's top scientific organisations.
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 | Since we can't sample the deepest regions of the Earth, scientists watch the velocity of seismic waves as they travel through the planet to determine the composition and density of that material. Now a new study suggests that material in part of the lower mantle has unusual electronic characteristics that make sound propagate more slowly, suggesting that the material there is softer than previously thought. The results call into question the traditional techniques for understanding this region of the planet. The authors, including Alexander Goncharov from the Carnegie Institution's Geophysical Laboratory, present their results in the January 25, 2008, issue of Science. ...> Full Article |
Using a novel device that simulates earthquakes in a laboratory setting, a team of researchers have shown that seismic waves - the sounds radiated from earthquakes - can induce earthquake aftershocks, often long after a quake has subsided.
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