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Tectonic plates act like variable thermostat
08-13-2007 · EurekAlert!PNAS study finds that heat loss from Earth's mantle is highly variable and depends on tectonic plate arrangement. Earth currently at relatively low level of heat loss.
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Keywords: tectonic, plates, act, variable, thermostat, plate
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- Measurements link magma melting rate to tectonic plate subduction rate
11-08-2007 · EurekAlert!
Geologists at the University of Illinois report new measurements of rock samples from Kick'em Jenny, a submarine volcano in the Caribbean, that link the rate at which magma is produced beneath subduction zone volcanoes to the rate at which tectonic plates converge in this plate tectonic setting.
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- Towards a better understanding of hot spot volcanism
01-31-2008 · EurekAlert!
Researchers from the IRD and the University of Chile investigated the phenomena that led to the recent activity of seven hot spots located in the central Pacific. Numerical mechanical models showed that variations in movement of the Pacific plate, generating shearing stresses within it, could facilitate the rise of magma towards the surface. This discovery, if corroborated, would indicate that the formation of certain hot spots depended on the movement of the tectonic plates.
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- Geologists recover rocks yielding unprecedented insights into San Andreas Fault
10-04-2007 · EurekAlert!
For the first time, geologists have extracted intact rock samples from 2 miles beneath the surface of the San Andreas Fault, the infamous rupture that runs 800 miles along the length of California.Never before have scientists had available for study rock samples from deep inside one of the actively moving tectonic plate-bounding faults responsible for the world's most damaging earthquakes. Now, with this newly recovered material, scientists hope to answer long-standing questions about the fault's composition and properties.
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- MU researcher to study volcanism with under-ocean sensors
02-05-2007 · EurekAlert!
Earthquakes and volcanic activity occur when the tectonic plates that make up Earth's surface move apart or converge. While this activity is relatively easy to observe on land, it’s more difficult to observe under the ocean, where most of it occurs. A University of Missouri-Columbia researcher will soon undertake a study to learn more about this process by placing sensors on a mid-ocean ridge called the East Pacific Rise.
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- Hungry for a Super Bowl victory?
01-31-2007 · EurekAlert!
Hungry for a Super Bowl victory? The Super Buffet table may end up making the final score. In a Champaign, IL sports bar, 53 Super Bowl partiers were treated to all-you-can-eat chicken wings buffet. Sports fans eating off of clean plates ate 43 percent more chicken wings than those whose bones stayed on their plates. Serve yourself onto a plate, and then stop when the plate is empty.
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- Plate tectonics may take a break
01-03-2008 · EurekAlert!
Plate tectonics, the geologic process responsible for creating the Earth's continents, mountain ranges, and ocean basins, may be an on-again, off-again affair. Scientists have assumed that the shifting of crustal plates has been slow but continuous over most of the Earth's history, but a new study from researchers at the Carnegie Institution suggests that plate tectonics may have ground to a halt at least once in our planet's history -- and may do so again.
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- Earth's Moving Crust May Occasionally Stop
01-09-2008 · Woods Hole Oceanographic Institution (WHOI)
The motion, formation, and recycling of Earth's
crust—commonly known as the theory of plate tectonics—have long been thought to
be continuous processes. But new research by geophysicists suggests that plate
tectonic motions have occasionally stopped in Earth's geologic history, and may
do so again.
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- Seismologists see Earth's interior as interplay between temperature, pressure and chemistry
10-25-2007 · EurekAlert!
Seismologists in recent years have recast their understanding of the inner workings of Earth from a relatively benign homogeneous environment to one that is highly dynamic and chemically diverse. This new view of Earth's inner workings depicts the planet as a living organism where events that happen deep inside can affect what happens at its surface, like the rub and slip of tectonic plates and the rumble of the occasional volcano.
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- Paired earthquakes separated in time and space
01-30-2008 · EurekAlert!
Earthquakes occurring at the edges of tectonic plates can trigger events at a distance and much later in time, according to a team of researchers reporting in today's (Jan. 31) issue of Nature. These doublet earthquakes may hold an underestimated hazard, but may also shed light on earthquake dynamics.
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- Complex structure observed in Tonga mantle wedge has implications for the evolution of volcanic arcs
04-12-2007 · EurekAlert!
The subduction zones where oceanic plates sink beneath the continents produce volcanic arcs such as those that make up the "rim of fire" around the Pacific Ocean. Although geologists have a pretty good picture of the processes that produce volcanic arcs, a new study finds that the structure of the mantle wedge above the subducting plate may be far more complex than anyone had imagined.
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