Sentences with phrase «along subduction»

To improve seismic hazard assessment along subduction zones as well as other dangerous faults such as continental transforms, we need a set of open software tools to explore alternatives, we need a trans - national dialogue to discuss and vet our different ideas and approaches, and we need to conduct prospective tests of global models that are based on these various national strategies.

These trenches form along subduction zones where slabs of the ocean floor slide into the Earth.

A tsunami caused by an earthquake along a subduction zone happens when the leading edge of the overriding tectonic plate breaks free and springs seaward, displacing the sea floor and the water above it.

Most of the continent's known volcanic eruptions have occurred along this subduction zone as well.

The release of water that takes place when the super-hydrated kaolinite breaks down could be an important part of the water cycle that causes volcanism along subduction zones.

Both events occurred along a subduction zone, an area where a tectonic plate dives or «subducts» beneath an adjacent tectonic plate.

In particular, they found that big, destructive quakes may have a better chance of occurring offshore of Washington and northern Oregon than farther south along the subduction zone — although any large quake would impact the surrounding area.

Data analysis and modelling suggest that varying uplift rates along subduction margins are mainly a short - term phenomenon.

The map shows that, so far, almost all of the aftershocks have occurred along the subduction zone that lies on the boundary of the Pacific plate.

Although the rate of subduction varies little along the entire arc, there are complex changes in the geologic processes along the subduction zone that dramatically influence volcanic activity, crustal deformation, earthquake generation and occurrence all along the western edge of South America.

On the Pacific Coast, this area sits along the subduction zone known as the Cascadia plate, which runs down the west coast of Canada to the west coast of the United States.

Not exact matches

An apocalyptically - worded story in the latest issue of the New Yorker detailed the devastation that might result from a high - magnitude earthquake along the Cascadia subduction zone, a fault line that runs from Cape Mendocino, Calif., to Vancouver Island, Canada.

They simulated earthquakes with magnitudes between 9.0 and 9.6 originating at different locations along the Aleutian - Alaska subduction zone, a 3,400 - kilometer (2,113 - mile) long ocean trench stretching along the southern coast of Alaska and the Aleutian Islands where the Pacific tectonic plate is slipping under the North American plate.

Three basic forces are believed to drive oceanic plate movement: plates are «pushed» away from mid-ocean ridges as new sea floor forms; plates are «pulled» as the oldest parts of the plate dive back into the earth at subduction zones; and convection within the asthenosphere helps ferry the plates along.

A magnitude - 9.0 earthquake would likely give way along the whole north - south extent of the subduction zone, but it's not well known how far east the shake - producing area would extend, approaching the area beneath major cities such as Seattle and Portland.

«Measuring the strength of olivine is critical to understanding how strong tectonic plates are, which, in turn, matters to how plates break and create subduction zones like those along the Cascadia plate, which runs down the west coast of Canada to the west coast of the United States,» said Warren, a geologist in the College of Earth, Ocean, and Environment.

In the early 1980s, two Caltech geophysicists, Tom Heaton and Hiroo Kanamori, compared Cascadia to active quake - prone subduction zones along the coasts of Chile and Alaska and to the Nankai Trough off the coast of Japan.

The Earth's lithosphere is divided into several plates that are in constant motion, and today's geologists have a good understanding of what drives these plate movements: heavier ocean plates are submerged beneath lighter continental plates along what are known as subduction zones.

Most earthquakes are said to occur at subduction zones or along faults in tectonic plates.

«Along with evidence of frictional obstruction to subduction,» Tsuji says, «the fault structure appears to have also impacted earthquake location and behavior.

«This was an event the thrust interface of the plate boundary system, confirming that there is a subduction system in the Haida Gwaii area,» said Honn Kao, seismologist with the Geological Survey of Canada, who, along with his colleagues, examined the source parameters — causative faults, rupture processes and depths — of the mainshock and sequence of strong aftershocks.

Although the South America plate exhibits a chain of active volcanism resulting from the subduction and partial melting of the Nazca oceanic lithosphere along most of the arc, these regions of inferred shallow subduction correlate with an absence of volcanic activity.

The convergence associated with this subduction process is responsible for the uplift of the Andes Mountains, and for the active volcanic chain present along much of this deformation front.

Subduction along the Peru - Chile Trench to the west of Chile has led to uplift of the Andes mountain range and has produced some of the largest earthquakes in the world, including the 2010 M 8.8 Maule earthquake in central Chile, and the largest earthquake on record, the 1960 M 9.5 earthquake in southern Chile.

The deep mantle - derived buoyancy, together with plate cooling at the surface, creates negative buoyancy that together explain the observations along the East Pacific Rise and surrounding Pacific subduction zones.

Vasiliki Mouslopoulou says: «It is not unlikely that coastlines along active subduction margins with no detectable tectonic uplift over the last 10,000 years will accommodate bigger than M7 earthquakes in the near future.»

We hope that this new finding will promote the mapping and discovery of such faults along active subduction margins and will also help explain the variability in the recurrence of great - earthquakes encountered on many subductions globally.»

Uplift is common along the coastlines of continents at subduction systems worldwide (e.g., Kamchatka, Japan, New Zealand and Papua New Guinea) with rates of vertical uplift accrued over the last 10,000 years being generally higher — up to ten times more than for time intervals larger than 125,000 years.

Onno Oncken of GFZ comments: «This is an intriguing finding that changes the stereotype view that all or most great subduction earthquakes occur along the active contact, i.e. plate - interface, of the two converging plates.

The study found compact sediments along the coast of Washington and northern Oregon, a result that suggests that the area could be more prone to producing larger quakes than subduction zone areas farther south with less compact sediments.

The seismic data collected by the Initiative has also helped Gao and her colleague Yang Shen at the University of Rhode Island, along with another study by Columbia University scientist Helen Janiszewski and Cornell University researcher Geoffrey Abers, to compile a picture of the CSZ structure that points to new places where the crushing pressure of subduction is squeezing water from and transforming rock at the trench where the Juan de Fuca plate is bending under the North American plate.

The events occurred along the shallow part of the Hikurangi subduction zone that runs along and across New Zealand.

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.

To understand sediment compaction along Cascadia, Han and her collaborators conducted a seismic survey off the coast of Washington and Oregon that allowed the researchers to see up to four miles of sediment layers overlaying the subduction zone.

The most hazardous swath of the northeastern Pacific lies along the Cascadia subduction zone (CSZ), a tectonic interface that parallels the coast and poses a seismic threat to cities such as Victoria, British Columbia; Portland, Ore.; and Eureka, Calif..

The earthquake occurred along a 500 - kilometre segment of the Peru - Chile subduction zone, where part of the Nazca Plate in the Pacific Ocean plunges beneath the South American Plate.

The subduction zone along the western edge of South America, where the Nazca plate slides eastward beneath the South American plate at an average rate of about 6.5 centimeters per year, can indeed generate massive quakes.

Geological observations at Stardust Bay, Alaska point toward previously unrecognized tsunami sources along a presently creeping part of the Aleutian Subduction Zone.

Researchers hope to use similar imaging techniques on other subduction zones, such as the Cascadia margin along the northern U.S. west coast, where there is a long history of large megathrust earthquakes and related tsunamis.

These findings, published by a team of scientists led by U.S. Geological Survey geologist Rob Witter in Geophysical Research Letters, a journal of the American Geophysical Union, present strong evidence for prehistoric tsunamis in the Aleutian Islands, and call for a reevaluation of earthquake and tsunami hazards along this part of the eastern Aleutian Subduction Zone.

Download Cascadia Deep Earthquakes Cascadia Subduction Zone Earthquakes: A magnitude 9.0 earthquake scenario Read our new publication about the effects of a major subduction earthquake on communities along the Cascadia Subduction Zone, stretching from the Brooks Peninsula on Vancouver Island to Cape Mendocino in northern CSubduction Zone Earthquakes: A magnitude 9.0 earthquake scenario Read our new publication about the effects of a major subduction earthquake on communities along the Cascadia Subduction Zone, stretching from the Brooks Peninsula on Vancouver Island to Cape Mendocino in northern Csubduction earthquake on communities along the Cascadia Subduction Zone, stretching from the Brooks Peninsula on Vancouver Island to Cape Mendocino in northern CSubduction Zone, stretching from the Brooks Peninsula on Vancouver Island to Cape Mendocino in northern California.

That variety implies that almost any scenario is possible in another part of the Pacific Rim where quake risk is thought to be high — along the Cascadia subduction zone offshore of Washington, Oregon, and other parts of the western United States and Canada.

The subducting plates do not slip continuously; instead, the plates are stuck together along the upper portion of the subduction fault, which is referred to as «locked zone.»

As longtime readers here know, Oregon will inevitably be struck by a potent earthquake generated along the Cascadia subduction fault offshore.

Some millions of years from now, that subduction zone (along with others acting to assemble the next supercontinent) will start pushing CO2 levels back up into the range that has prevailed for most of the latter Phanerozoic.

The deep mantle - derived buoyancy, together with plate cooling at the surface, creates negative buoyancy that together explain the observations along the East Pacific Rise and surrounding Pacific subduction zones.