Sentences with phrase «by subduction zone»

It used measurements from 195 core samples containing submarine landslide deposits caused by subduction zone earthquakes, instead of only about a dozen such samples in past research.

The study of new linkages between the two types of seismic activity, published in Nature Geoscience on Sept. 11, may help promote better understanding of earthquake hazard posed by subduction zones, a type of fault responsible for some of the world's most powerful earthquakes.

The Pacific Ocean is the only ocean which is almost totally bounded by subduction zones.

My gut feeling is that the regional and local geologic context, when added to the commonalities shared by subduction zones, will keep them unpredictable.

Not exact matches

The pressure difference could be caused by hot, partially molten rock piled up beneath mid-ocean ridges or beneath the cooling plates diving into the earth at subduction zones, the authors write.

One hint of weak coupling at a subduction zone is the presence of serpentinite — a mineral formed when seawater carried down by a descending plate reacts with mantle rock.

The billion - year time lag between the earliest, «proto - subduction» and the full onset of plate tectonics can be explained by the slow, painstaking development of weak zones within the plates, he proposes.

Since 1900, numerous magnitude 8 or larger earthquakes have occurred on this subduction zone interface that were followed by devastating tsunamis, including the 1960 M9.5 earthquake in southern Chile, the largest instrumentally recorded earthquake in the world.

In these regions of «flat - slab» subduction, the Nazca plate moves horizontally for several hundred kilometers before continuing its descent into the mantle, and is shadowed by an extended zone of crustal seismicity in the overlying South America plate.

Hawai'i is especially vulnerable to a tsunami created by an earthquake in the subduction zone of the Aleutian Islands.

Many people understand the damage that can be caused to structures, roads, bridges and utilities by ground shaking in these long - lasting types of earthquakes, such as the one that's anticipated on the Cascadia Subduction Zone between northern California and British Columbia.

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.

The triggering effect was probably accentuated by an offshore «sedimentary wedge» — a mass of sedimentary rock piled up at the edge of the subduction zone boundary offshore from the North Island's east coast.

Intriguingly, the part of the subduction zone that broke was not the part that had built up the most stress, according to a ground - motion study of northern Chile's seismic gap by Marianne Métois, a geophysicist at the National Institute of Geophysics and Volcanology in Rome, and her colleagues (M. Métois et al.Geophys.

The volcanoes are formed by conditions at the subduction zone where one of Earth's largest tectonic plates, the Pacific Plate, dives beneath the Australian Plate.

The new measurements in this research were made with cores that showed the results of massive amounts of sediments released by subsea landslides during a subduction zone earthquake — a catastrophic event beneath the sea as well as on land.

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.

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.

Sumatra's 2004 earthquake should have been a wake - up call; giant earthquakes can occur on any subduction zone, and such events will likely be accompanied by very large tsunamis.

The human fossil fuel CO2 emissions spike is more like an asteroid impact than the slow degassing of CO2 from metamorphic decarbonization of carbonate rocks at subduction zones by the slow grinding away of plate tectonics.

Spreading rifts and subduction zones usually arise at the deepest ocean parts, almost by definition.

The links below address (a) the weathering from the uprising Appalachian Mountains and an ice age 450 million years ago, (b) scientists suspecting that our current ice age, which began 40 million years ago, was caused by the rise of the Himalayas and (c) a mechanism for CO2 recycling from subduction zones:

Here in Oregon we are the somewhat unwitting hosts of a great deal of methane hydrate research by Oregon State University, some Texas university people (and backing by the good old Houston - based gas industry), of deposits on and near the ocean floor on the Gorda Ridge just off our coast, which is a consequence of the subduction zone geomorphology of the area.