Sentences with phrase «for subduction»

Not exact matches

These initial results provide fundamental insights into the behavior of rare, very large earthquakes that may aid in preparation and early warning efforts for future tsunamis following subduction zone earthquakes.

Therefore developing a better understanding of earthquake and tsunami behavior and potential is a priority for local communities, for the wider Indian Ocean, and for related subduction zones.»

«This ocean drilling expedition will for the first time drill scientific boreholes within the sediments entering this subduction zone, including the layer of sediment that eventually develops into the earthquake - generating fault,» Professor Henstock explained.

Scientists have long wondered what accounts for that precipitous dive, and why the massive earthquakes that generate long - ranging tsunamis at other subduction zones have not been recorded in the trench.

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.

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.

It is proposed that the development of this modelling strategy could enable the estimation of critical failure thresholds for other mapped subduction asperities where subducting and overriding plates are currently locked.

For example, the Caribbean coast of northern Colombia resembles a classic subduction zone with the potential for tsunamigenic M > 8 earthquakes at millennial time scales, but the absence of a large earthquake since 1492 is cause for complacency among local populatioFor example, the Caribbean coast of northern Colombia resembles a classic subduction zone with the potential for tsunamigenic M > 8 earthquakes at millennial time scales, but the absence of a large earthquake since 1492 is cause for complacency among local populatiofor tsunamigenic M > 8 earthquakes at millennial time scales, but the absence of a large earthquake since 1492 is cause for complacency among local populatiofor complacency among local populations.

This regularity could shed light on the workings of tectonic plate boundaries called subduction zones, and it might even turn out to herald a season of heightened risk for larger quakes.

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.»

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.

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.»

This finding has applications to the seismic hazard of these regions, as it highlights the potential for future damaging earthquakes and tsunamis at active subduction margins with no measurable recent uplift.

The findings, published in Nature Geoscience on Nov. 20, are important for understanding factors that influence earthquake and tsunami generation in Cascadia and at other subduction zones around the world.

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.

What we show is that under reasonable assumptions for conditions on Europa, subduction could be happening there as well, which is really exciting.»

These three swarms seem to have prepared the subduction zone to rupture in the big 1 April quake, says Onno Oncken, a geophysicist at the German Research Centre for Geosciences in Potsdam.

Subduction zones are noted for producing some of the biggest earthquakes — the 2004 Indian Ocean quake also arose from a subducSubduction zones are noted for producing some of the biggest earthquakes — the 2004 Indian Ocean quake also arose from a subductionsubduction zone.

The challenge, said Kohler, was to develop a standard set of algorithms that could account for the different tectonic environments in each region, including the offshore subduction zone in the Pacific Northwest and the mostly on - shore faults in California.

Based in part on the growing certainty about these issues, OSU has developed the Cascadia Lifelines Program, an initiative working with Pacific Northwest business and industry to help prepare for the upcoming subduction zone earthquake, mitigate damage and save lives.

«However, with more detailed data we have also changed somewhat our projections for the average recurrence interval of earthquakes on the subduction zone, especially the northern parts.

For example, waves move slower when passing through hot magma, such as mantle plumes and hotspots, than they do when passing through colder subduction zones, locations where one tectonic plate slides beneath another.

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.

For mid-latitude coasts that border subduction zones, sequences of buried soils may provide a long - duration, subsidence stratigraphic paleoseismic record that spans to the present, but in other settings such as the Aceh coastal plain, joint research approaches, for example targeted foraminiferal analyses and palynology, are required to both exploit the changing form of the relative sea - level curve and characterize coastal evolution in the context of the diminishing importance of accommodation spaFor mid-latitude coasts that border subduction zones, sequences of buried soils may provide a long - duration, subsidence stratigraphic paleoseismic record that spans to the present, but in other settings such as the Aceh coastal plain, joint research approaches, for example targeted foraminiferal analyses and palynology, are required to both exploit the changing form of the relative sea - level curve and characterize coastal evolution in the context of the diminishing importance of accommodation spafor example targeted foraminiferal analyses and palynology, are required to both exploit the changing form of the relative sea - level curve and characterize coastal evolution in the context of the diminishing importance of accommodation space.

Location map of Sumatra, Indonesia, depicting rupture areas for the AD 2004 and 2005 subduction zone earthquakes.

The authors conclude that knowing the relative sea - level record for a coastal region on a subduction zone margin is the initial step in investigating paleoseismic history.

Megathrusts, the huge continuous faults found in subduction zones, are responsible for Earth's largest 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.

For years, scientists have wondered if certain surface features are the result of plate tectonics, which, if true, would make Europa the only known place in the Solar System other than Earth to experience large, subduction - driven quakes.

Maybe whether a prior era of subduction put a lot of carbon down into the magma for volcanos to belch out?

Also, it is suggested that at least 20 % of Mg is lost from continents by chemical weathering (Mg being extremely mobile during weathering), which is one of the primary controls for finally leaving behind a Si - rich and Mg - poor continental mass, thereby decreasing crustal recycling by subduction (Lee et al. 2008), important for continental survival.

CREW has published a Cascadia subduction zone earthquake and tsunami scenario for emergency - planning purposes.

Tectonic forces became metaphors for the shifts in her personal relationships, and she mounted solo exhibitions with titles such as Love and Subduction, Ebb & Flow and Deep Rift.

The title of the exhibition operates as a metaphor for the works presented: «subduction» is the geological process of pressure over time in the natural production of diamonds from carbon.

Maybe whether a prior era of subduction put a lot of carbon down into the magma for volcanos to belch out?

You're right WRT tree huggers, but forests can grow trees for burial in tectonic subduction zones.

Trees, OTOH, can be grown for a few decades, harvested and deposited in offshore subduction trenches for rapid burial by anaerobic sediment: bye - bye carbon for the subsequent tectonic cycle.

One explanation for the catastrophic resurfacing is the episodic subduction hypothesis.

Convective patterns driven by heat transport in the interior of the Earth push one crustal plate under another (subduction) and the friction heats up the magma necessary for volcanic action — which in turn releases CO2 into the atmosphere.

who believe there is a subduction (and http://hockeyschtick.blogspot.fr/2013/09/new-paper-finds-oceans-are-net-source.html) «At temperate latitudes, the subduction of DIC and to a much lesser extent... At the global scale, these two large counter-balancing fluxes of DIC amount to +275.5 PgC yr — 1 for the supply by obduction and — 264.5 PgC yr — 1 for the removal by subduction which is 3 to 5 times larger than previous estimates.»

The prevalence of La Niña, with the associated shallow subduction of heat below the surface in the Pacific, has been proposed as the reason for the current hiatus (16).

And if tectonic subduction zones did not continually recycle some of that via andesic volcanoes back into the atmosphere for photosynthesis, you and everything else on Earth would already be long dead of starvation.

«If you look at the preserved record, diagnostic evidence for modern plate tectonics involving deep subduction is mainly Neoproterozoic and younger,» says Nathaniel Miller, co-author of the study.

Since then, atmospheric CO2 declined as the Indian and Atlantic Oceans have been major depocentres for carbonate and organic sediments while subduction of carbonate - rich crust has been limited mainly to small regions near Indonesia and Central America [10], thus allowing CO2 to decline to levels as low as 170 ppm during recent glacial periods [11].

In broadly related news, I was interested to see a few days ago that a nascent subduction zone has been identified off Portugal, meaning that the Atlantic is already in the earliest stage of its inevitable disappearance, although for the moment spreading remains the dominant process.

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 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:

Since that time the Indian and Atlantic Oceans have been the major depocenters for carbon, with subduction of carbon - rich crust limited mainly to small regions near Indonesia and Central America [47].