Subduction Zones Current Events

Subduction Zones Current Events, Subduction Zones News Articles.
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Global map to predict giant earthquakes
A team of international researchers, led by Monash University's Associate Professor Wouter Schellart, have developed a new global map of subduction zones, illustrating which ones are predicted to be capable of generating giant earthquakes and which ones are not. (2013-12-12)

Megathrust quake faults weaker and less stressed than thought
Some of the inner workings of Earth's subduction zones and their 'megathrust' faults are revealed in a paper published today in the journal Science. US Geological Survey scientist Jeanne Hardebeck calculated the frictional strength of subduction zone faults worldwide, and the stresses they are under. Stresses in subduction zones are found to be low, although the smaller amount of stress can still lead to a great earthquake. (2015-09-10)

New 'embryonic' subduction zone found
A new subduction zone forming off the coast of Portugal heralds the beginning of a cycle that will see the Atlantic Ocean close as continental Europe moves closer to America. (2013-06-17)

Plate tectonics may take a break
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. (2008-01-03)

URI geological oceanographer receives $143,000 grant to study the dynamics of the Earth's mantle
University of Rhode Island Graduate School of Oceanography (GSO) geophysicist Chris Kincaid has received $143,000 from the National Science Foundation (NSF) to study flow patterns in the Earth's mantle in subduction zones. The proposal Kincaid wrote to acquire the grant was the top-ranked out of 45 proposals submitted to the NSF margins program. (2001-09-25)

M 9.0+ possible for subduction zones along 'Ring of Fire,' suggests new study
The magnitude of the 2011 Tohoku quake (M 9.0) caught many seismologists by surprise, prompting some to revisit the question of calculating the maximum magnitude earthquake possible for a particular fault. New research offers an alternate view that uses the concept of probable maximum magnitude events over a given period, providing the magnitude and the recurrence rate of extreme events in subduction zones for that period. Most circum Pacific subduction zones can produce earthquakes of magnitude greater than 9.0, suggests the study. (2014-09-15)

New fault zone measurements could help us to understand subduction earthquake
University of Tsukuba researchers have conducted detailed structural analyses of a fault zone in central Japan to identify the specific conditions that lead to devastating earthquake. The seismic slip processes that were inferred based on the measurements may be applicable to other subduction zones, such as those below the oceans. The gathered data could be applied in future attempts to describe or model the subduction earthquakes that lead to ground shaking and tsunami risk. (2020-10-30)

Earthquake analysis reveals changes in fault zones with depth below surface, shedding new light on the nature of destructive earthquakes
A new analysis of subduction zone earthquakes indicates that key properties of the fault zones change systematically with depth, resulting in very different types of earthquakes depending on the depth at which the fault ruptures. The new findings represent a significant advance in understanding some of the most destructive types of earthquakes, including those that cause tsunamis. (1999-07-28)

Research may explain mysterious deep earthquakes in subduction zones
Geologists from Brown University may have finally explained what triggers certain earthquakes that occur deep beneath the Earth's surface in subduction zones, regions where one tectonic plate slides beneath another. The researchers have shown strong evidence that water squeezed out of a mineral called lawsonite could trigger these mysterious quakes. (2016-02-03)

Is there an ocean beneath our feet?
Scientists at the University of Liverpool have shown that deep sea fault zones could transport much larger amounts of water from the Earth's oceans to the upper mantle than previously thought. Seismologists at Liverpool have estimated that over the age of the Earth, the Japan subduction zone alone could transport the equivalent of up to three and a half times the water of all the Earth's oceans to its mantle. (2014-01-27)

How to interact between mantle and crustal components in the subduction zone?
Subduction process drives the differential evolution of the earth and realizes material cycle and energy exchange. Recent studies have shown that orogenic peridotites reveal crust-mantle interaction in subduction zone. SCIENCE CHINA Earth Sciences has published relevant reports. (2019-05-24)

UCL scientists create first earthquakes in the laboratory
Scientists at UCL have recreated earthquakes in the laboratory for the first time allowing them to better understand the origin of the largest and most violent earthquakes. This is the first time scientists have been able to generate and observe deep and intermediate focus earthquakes in the laboratory, recreating the exact pressure and temperature conditions of the deep earth. Their results have helped elucidate the origin of some of the largest and most violent earthquakes to occur on earth. (2002-11-14)

Sediment layer may forecast greatest earthquakes
Researchers at Yale and the University of Washington report that great earthquakes, like the 2004 Sumatra earthquake, may be caused by the build up of sediment on top of subduction zones, suggesting a new way to forecast these most severe earthquakes. (2006-01-30)

The origin of the Andes unravelled
Why do the Andes exist? Why is it not a place of lowlands or narrow seas? Wouter Schellart, a geophysicist at the Vrije Universiteit Amsterdam, has been pondering these questions for more than a decade. Now, he has found the answers using an advanced computer model. (2017-12-11)

Cold plates and hot melts
The movements of Earth's tectonic plates shape the face of our planet. The sinking of one plate beneath another causes volcanism and earthquakes. As part of the International Ocean Discovery Program, an international science team was able to drill and investigate the origin of a subduction zone for the first time in 2014. The team is now publishing its data in the international scientific journal Earth and Planetary Science Letters. (2017-02-10)

The Swallowing of Earth's Ocean Floors
An international team of scientists representing nine countries will this month board the drill ship JOIDES Resolution -- currently docked in San Diego, California -- to study the ocean floor off Costa Rica. (1996-10-23)

Scientists pinpoint great-earthquake hot spots
The world's largest earthquakes occur at subduction zones - locations where a tectonic plate slips under another. But where along these extended subduction areas are great earthquakes most likely to happen? Scientists have now found that regions where 'scars' on the seafloor, called fracture zones, meet subduction areas are at higher risk of generating powerful earthquakes. The results are published today in Solid Earth, an Open Access journal of the European Geosciences Union. (2012-12-05)

Not all subduction zones are equal in carbon dioxide generation
A major concern of global warming researchers is the amount of carbon dioxide in the atmosphere, but estimates of the carbon dioxide components emitted at arc volcanoes may be high, according to geoscientists, and may cloud the picture of global warming. (2001-05-16)

Japanese earthquake zone strongly influenced by the effects of friction
An international research team led by Kyushu University (Japan) identified that subduction-related friction and pre-existing fault structures in the Eurasian/Philippine Sea plate boundary significantly influences earthquake location and rupturing behavior. The degree of friction decreases towards the Nankai Trough, resulting in non-uniform stress accumulation that has influenced the location of historic and modern earthquakes in the region. (2017-10-25)

Salty water and gas sucked into Earth's interior helps unravel planetary evolution
An international team of scientists has provided new insights into the processes behind the evolution of the planet by demonstrating how salty water and gases transfer from the atmosphere into the Earth's interior. (2011-09-25)

Seafloor sediments appear to enhance Earthquake and Tsunami danger in Pacific Northwest
The Cascadia Subduction Zone off the coast of the Pacific Northwest has all the ingredients for making powerful earthquakes -- and according to the geological record, the region is due for its next 'big one.' A new study led by The University of Texas at Austin has found that the occurrence of these big, destructive quakes and associated devastating tsunamis may be linked to compact sediments along large portions of the subduction zone. (2017-11-20)

New clues to deep earthquake mystery
A new understanding of our planet's deepest earthquakes could help unravel one of the most mysterious geophysical processes on Earth. (2020-05-27)

The world's oceans seem to be draining away
Within a billion years, our planet could be as dry and barren as Mars, claim geologists in Tokyo. They have calculated that the oceans are leaking water into the Earth's mantle five times as fast as it is being replenished. (1999-09-08)

Geologist suggests water may reside as ice deep in planets' interior
A Northwestern geologist reports that water may be transported into the interior of planets as a high-pressure form of ice, rather than being transported while trapped within hydrous minerals or escaping as a fluid. This process should become more important as planets cool, as in a future Earth or Mars. (2000-12-12)

New study helps pinpoint when earth's plate subduction began
According to findings published Dec. 9 in the journal Science Advances, plate subduction could have started 3.75 billion years ago, reshaping Earth's surface and setting the stage for a planet hospitable to life. (2020-12-09)

Supercycles in subduction zones
When tectonic plates collide, they produce earthquakes like the recent one in Nepal. Researchers at ETH Zurich are providing new ways to explain how and why earthquake supercycles occur in zones where one plate moves under another, such as off the coast of Japan. (2015-05-06)

Deep, slow-slip action may direct largest earthquakes and their tsunamis
Megathrust earthquakes and subsequent tsunamis that originate in subduction zones like Cascadia -- Vancouver Island, Canada, to northern California -- are some of the most severe natural disasters in the world. Now a team of geoscientists thinks the key to understanding some of these destructive events may lie in the deep, gradual slow-slip behaviors beneath the subduction zones. This information might help in planning for future earthquakes in the area. (2020-12-21)

Modeling magma to find copper
About 70 percent of the copper comes from deposits formed several million years ago during events of magma degassing within the Earth's crust just above subduction zones. Despite similar ore forming processes, the size of these deposits can vary orders of magnitude, the main reason of which has remained unclear. A study led by researchers from UNIGE and the Saint-Etienne suggests that the answer may come from the volume of magma placed in the crust. (2017-01-12)

Geoscientists create deeper look at processes below Earth's surface with 3D images
Geoscientists at The University of Texas at Dallas recently used massive amounts of earthquake data and supercomputers to generate high-resolution, 3D images of the dynamic geological processes taking place far below the Earth's surface. In a study published April 29 in Nature Communications, the research team described how it created images of mantle flows in a subduction region under Central America and the Caribbean Sea. (2020-06-17)

Curtin study could rewrite Earth's history
Curtin University-led research has found new evidence to suggest that the Earth's first continents were not formed by subduction in a modern-like plate tectonics environment as previously thought, and instead may have been created by an entirely different process. (2020-07-07)

Sinking sea mountains make and muffle earthquakes
Subduction zones -- places where one tectonic plate dives beneath another -- are where the world's largest and most damaging earthquakes occur. A new study has found that when underwater mountains -- also known as seamounts -- are pulled into subduction zones, not only do they set the stage for these powerful quakes, but also create conditions that end up dampening them. (2020-03-02)

The connectivity of multicomponent fluids in subduction zones
A team of researchers has discovered more about the grain-scale fluid connectivity beneath the earth's surface, shedding new light on fluid circulation and seismic velocity anomalies in subduction zones. (2020-11-12)

Sediment could be a major factor in biggest subduction zone earthquakes
New research indicates sediment buildup in tectonic plate deformations could play a major role in determining the severity of subduction zone earthquakes. (2006-01-30)

Earth's past gives clues to future changes
Scientists are a step closer to predicting when and where earthquakes will occur after taking a fresh look at the formation of the Andes, which began 45 million years ago. (2011-11-23)

Geologist's discoveries resolve debate about oxygen in Earth's mantle
While there continues to be considerable debate among geologists about the availability of oxygen in the Earth's mantle, recent discoveries by a University of Rhode Island scientist are bringing resolution to the question. (2010-12-14)

Studying ancient Earth's geochemistry
Researchers still have much to learn about the volcanism that shaped our planet's early history. New evidence from a team led by Carnegie's Frances Jenner demonstrates that some of the tectonic processes driving volcanic activity, such as those taking place today, were occurring as early as 3.8 billion years ago. Their work is published in Geology. (2013-01-18)

Study indicates unexpected earthquake dangers lie beneath the Pacific Northwest
Under heat and pressure, minerals are breaking down deep beneath your feet. A new study confirms that where the earth is hotter these processes occur shallower, and consquently have significant seismic results. If you live in the Pacific Northwest, this only recently understood process might rock your world. (1999-10-27)

Volcanic arcs form by deep melting of rock mixtures
A new study published in the journal Science Advances changes our understanding of how volcanic arc lavas are formed, and may have implications for the study of earthquakes and the risks of volcanic eruption. (2017-04-07)

Special issue of BSSA focuses on 2004 Sumatra earthquake
The 2004 earthquake is the focus of the January special issue of the Bulletin of the Seismological Society of America (BSSA), in which scientists present research and analyses about the current state of earthquakes and tsunamis, as learned from the Sumatra-Andaman event. (2007-01-09)

2002 Alaskan quake left 7 areas of California stirred but not shaken
New research has found evidence of tremors along non-subduction zone faults in seven California locations immediately following the magnitude 7.8 Denali earthquake in Alaska on Nov. 3, 2002. (2007-11-22)

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