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> Puerto Rico Trench - Could it produce a big one?, Puerto Rico Trench is a sub duction zone.
PSUWeatherNewbie
post Jan 15 2010, 04:43 PM
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Could the Puerto Rico Trench produce a big one, similar in intensity to the Sumatra/Indian Ocean earthquake/tsunami event in 2004? The question isn't if, but when it will happen. Past history has shown a rather unique pattern of activity including the major 7.6 or greater magnitude quakes. 9 major earthquakes in the last 500 years, averaging 55 years between quakes. Since the last one we are near that average between quakes. The sub duction zone of the Caribbean and Altantic Ocean region is not quite as strong as the Cascadia and Sumatra zones, but they are strong enough to produce an unequivocal disaster worse then the Haiti earthquake. We have to remember that the Haiti earthquake was of 7.0 magnitude strength, but the worst quakes could average between a 7.9-8.1 magnitude with the potential of an 8.5 magnitude quake. The Cascadia trench west of the west coast of the US has an even higher and potentially more intense and utterly more devastating earthquake and tsunami because of the distance between the potential earthquake and the big cities of the west coast which is around 15 miles. The shear little distance between the epicenter and cities could bring a potential major disaster to the US, perhaps eclipsing the 1900 Galveston Hurricane where 6-12 thousand people died. The Puerto Rico Trench has a history of producing major disasters for the Caribbean Sea Island chain and Atlantic Ocean. We need to be aware of a more devastating earthquake which could produce a major tsunami which could put the US coastline at risk from a more devasting ocean wide tsunami equally to that of the 2004 Indian Ocean Tsunami.
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Sagebrusher
post Jan 18 2010, 11:04 AM
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This trench will eventually propagate north and southward along the east coast of the Americas...check out this map of the world 150 million years from now...

http://www.scotese.com/future1.htm
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mmi16
post Jan 26 2010, 03:22 AM
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Plate tectonics and their movements is very interesting.

History Channel last weekend was showing a 'How the Earth Was Made' marathon which to a greater extent than not dealt with how the Earth we know today was created from the movement of the various plates.


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mmi16
post Mar 10 2010, 04:00 AM
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Seemingly the most severe Earthquakes take place where one tectonic plate is being subducted under another plate.

I am wondering if during the history of the Earth, if one plate has been fully subducted under another and fully traversed that plate to 'rise' on the other side of the 'top' plate.


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