Sentences with phrase «great subduction»

The recent spate of great subduction - zone quakes, of magnitude 8 or larger, began with the 2004 Sumatra earthquake.

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 mechanics of great subduction earthquakes are influenced by the frictional properties, structure, and composition of the plate - boundary fault.

Not exact matches

Asked what's new with these findings Vasiliki Mouslopoulou explains: «For the first time temporal clustering of great - earthquakes is shown on active subduction margins, indicating an intense period of strain release due to successive earthquakes, followed by long periods of seismic quiescence.»

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.»

Stresses in subduction zones are found to be low, although the smaller amount of stress can still lead to a great earthquake.

Lead author of the study, Dr Caroline Eakin, Research Fellow in Ocean and Earth Science at the University of Southampton, said: «The process of consuming old seafloor at subduction zones, where great slabs of oceanic material are swallowed up, drives circulation in the Earth's interior and keeps the planet going strong.

If the subduction zone near Sendai can produce a great quake, then other areas with similarly old ocean crust might too, says Okal, who says that Tonga and the northeastern Caribbean are regions to look at more closely.

One way to learn more about the transformations in greater depths of subduction zones is to create similar conditions in the laboratory.

In Japan, the Kuril Islands, and the Solomon Islands, great mega-thrust ruptures have ruptured portions of the subduction zones that were thought too warm or weak to experience earthquakes.

The great Sumatra - Andaman earthquake of Dec. 26, 2004, for instance, unzipped a 1,300 kilometer long segment of the subduction zone and unleashed one of history's most destructive, deadly tsunamis.

Faster sea floor spreading, presumably associated with more volcanic activity at subduction zones, and / or other increases in volcanic activity or geologic outgassing, or faster oxidation of exposed fossil organic C (as in shales)-- greater geologic CO2 emissions (I think another way of looking at the inorganic part is that any given region of sea floor has less time to accumulate carbonate minerals from chemical weathering, so that C reservoir could shrink while others, including the atmosphere, can grow).

A unique aspect of a great Cascadia subduction earthquake is the strong likelihood that the three greater metropolitan areas of Portland, Seattle, and Vancouver will simultaneously feel the effects of strong and sustained ground shaking.

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I predict greater surface salinity, much earlier melt, great adiabatic events at sea surface to air interface, wide early thousand lead expansion events coinciding with at start clear than very cloudy air, a surprising near ice death experience at the North Pole because the North Greenland subduction zone is already very fluid.

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.