Let's take a journey into the depths of the Earth, down through the crust and mantle nearly to the core. We'll use seismic waves to show the way, since they echo through the planet following an earthquake and reveal its internal ...
Earth Sciences
Dec 30, 2021
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The warming and thawing of permafrost in response to rising temperatures are increasingly destabilizing rock slopes, causing more occurrences of rockfall in recent years. This trend is expected to continue, raising concerns ...
Earth Sciences
Nov 4, 2021
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Nearly 1,800 miles below the earth's surface, there are large odd structures lurking at the base of the mantle, sitting just above the core. The mantle is a thick layer of hot, mostly plastic rock that surrounds the core; ...
Earth Sciences
Sep 21, 2018
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With four years of data from 268 seismometers on the ocean floor and several hundred on land, researchers have found anomalies in the upper mantle below both ends of the Cascadia Subduction Zone. They may influence the location, ...
Earth Sciences
Jul 25, 2018
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Most of what we know about earthquakes and volcanoes is based on what we can observe at the Earth's surface. However, most of the action, especially early activity that could help with disaster prediction and preparedness, ...
Earth Sciences
Dec 7, 2017
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The Earth's mantle—the layer between the crust and the outer core—is home to a primordial soup even older than the moon. Among the main ingredients is helium-3 (He-3), a vestige of the Big Bang and nuclear fusion reactions ...
Earth Sciences
Feb 6, 2017
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Seismic studies are helping scientists learn more about the structure of subducting oceanic plates.
Earth Sciences
Jan 29, 2013
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In a new analysis of the 2004 magnitude 6.0 Parkfield earthquake in California, David Schaff suggests some limits on how changes measured by ambient seismic noise could be used as a pre-earthquake signal.
Earth Sciences
Aug 2, 2012
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An earthquake is first detected by the abrupt side-to-side jolt of a passing primary wave. Lagging only slightly behind are shear waves, which radiate out from the earthquake's epicenter and are seen at the surface as a rolling ...
Earth Sciences
Mar 5, 2012
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