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Cascadia MegaQuake Subduction Zone Megathrust - National Geographic Doomsday Earth

 
Seattle Six
User ID: 1476011
New Zealand
08/14/2011 11:51 PM
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Cascadia MegaQuake Subduction Zone Megathrust - National Geographic Doomsday Earth
The fault has been dormant for more than 300 years, but when it awakens tomorrow or decades from now the consequences could be devastating.

The last rupture unleashed the largest known quake to hit the Lower 48 a magnitude-9 that sent tsunami waves crashing into Japanese coastal villages.

Recent computer simulations of a hypothetical magnitude-9 quake found that shaking could last 2 to 5 minutes strong enough to potentially cause poorly constructed buildings from British Columbia to Northern California to collapse and severely damaging highways and bridges.

Such a quake would also send powerful waves rushing to shore in minutes. While big cities such as Portland and Seattle would be protected from severe flooding, low-lying seaside communities may not be as lucky.

The Pacific Northwest "has a long geological history of doing exactly what happened in Chile," said Brian Atwater, a geologist with the U.S. Geological Survey and University of Washington. "It's not a matter of if but when the next one will happen."

The Pacific Northwest fault behaves much like the one that broke offshore Chile that triggered a magnitude-8.8 quake. Shaking lasted 2½ minutes and the temblor destroyed or badly damaged 500,000 homes.

Located just 50 miles off the coast, the 680-mile-long Cascadia fault is part of several seismic hotspots around the globe where plates of the Earth's crust grind and dive. These so-called subduction zones give rise to mountain ranges, ocean trenches and volcanic arcs, but also spawn the largest quakes on the planet.

There's an 80 percent chance the portion of the fault off southern Oregon and Northern California would break in the next 50 years and produce a megaquake.


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Anonymous Coward (OP)
User ID: 1476011
New Zealand
08/15/2011 12:22 AM
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Re: Cascadia MegaQuake Subduction Zone Megathrust - National Geographic Doomsday Earth
In the late evening of August 11, a weak earthquake with a magnitude of 3.3 was sending a emotional vibration through parts of British Colombia. The earthquake was too weak to create any damage or injuries, but the sensation of feeling an earthquake, tells the people to be ready if a major one would arrive.

Magnitude : 3.3
UTC Time : Friday, August 12, 2011 at 06:02:11 UTC
Local time at epicenter : Thursday, August 11, 2011 at 11:02:11 PM at epicenter
Depth (Hypocenter) : 19.5 km
Geo-location(s) :
Epicenter in Golden Ears Provincial Park.
56 km (34 miles) NNW of Abbotsford, British Columbia, Canada
59 km (36 miles) NE of Vancouver, British Columbia, Canada

[link to earthquake-report.com]





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