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Go Back   Armchair General and HistoryNet >> The Best Forums in History > Current Events > Latin America & the Caribbean > Haiti

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Haiti Jan 2010 Earthquake in Haiti. .

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  #1  
Old 14 Jan 10, 15:39
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The Earthquake

The Haiti earthquake is the most powerful temblor to hit this region in over 200 years. The quake was felt as far away as Tampa, Florida and Caracas, Venezuela. It occurred on a left-lateral strike-slip fault system at the boundary of the Caribbean and North American plates. The Caribbean plate is moving eastward relative to the North American plate.





The green lines represent transform (strike-slip) faults, the magenta lines are subduction zones on the maps above.

The map below shows the shake intensity. Red is just about as bad as it gets...



The epicenter of this quake coincides with the most populated part of Haiti...



The red and orange contours are areas in which the Modified Mercalli Intensity ranged from 8 to 10. Vulnerable buildings will suffer heavy to very heavy damage at an MMI of 8 and higher. More than 2,200,000 people (~25% of Haiti's population) live in the area subjected to an MMI of at least 8.


USGS: Magnitude 7.0 - HAITI REGION
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  #2  
Old 14 Jan 10, 15:49
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What about the before/after comparison map?
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  #3  
Old 14 Jan 10, 16:05
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Quote:
Originally Posted by The Doctor View Post
The Haiti earthquake is the most powerful temblor to hit this region in over 200 years. The quake was felt as far away as Tampa, Florida and Caracas, Venezuela. It occurred on a left-lateral strike-slip fault system at the boundary of the Caribbean and North American plates. The Caribbean plate is moving eastward relative to the North American plate.

A major earthquake like could have caused a huge Tsunami no?
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Old 14 Jan 10, 16:07
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Originally Posted by PGT Beauregard View Post
A major earthquake like could have caused a huge Tsunami no?
I don't think it is the right kind of fault for a tsunami but I'm not really sure now.
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Old 14 Jan 10, 16:08
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Quote:
Originally Posted by Vita View Post
What about the before/after comparison map?
The displacement along the fault wouldn't show up on a map.

The lateral displacement along the fault at the hypocenter was ~480 cm (~16 ft) at a depth of 11 km (~6 miles). Almost all of the displacement was within 20 km of the hypocenter.

At the surface of the Earth the expression of the lateral displacement would be a maximum of about 7 feet at the epicenter, dropping off to 0 feet within 10 km of the epicenter.



Plate movement along the Enriquillo-Plantain Garden Fault averages about 20 mm per year. A small section of the fault at a depth of 11 km near Port au Prince suddenly moved 480 cm and caused a massive quake.
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Old 14 Jan 10, 16:10
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Quote:
Originally Posted by PGT Beauregard View Post

A major earthquake like could have caused a huge Tsunami no?
Quote:
Originally Posted by GCoyote View Post
I don't think it is the right kind of fault for a tsunami but I'm not really sure now.
Correct.

It's not really the right kind of fault to generate a tsunami... But that doesn't mean that it couldn't have triggered one. A tsunami watch was issued for the Caribbean just as a precaution.
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Old 14 Jan 10, 16:25
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Quote:
Originally Posted by The Doctor View Post
Correct.

It's not really the right kind of fault to generate a tsunami... But that doesn't mean that it couldn't have triggered one. A tsunami watch was issued for the Caribbean just as a precaution.
Thanks, another question all volcanos of the caribean islands are the consequences of these faults.?
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Old 14 Jan 10, 16:29
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USGS was reporting yesterday that the vertical lift on the quake was less then 12 inches hence no tsunami.
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Old 14 Jan 10, 16:49
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Quote:
Originally Posted by PGT Beauregard View Post
Thanks, another question all volcanos of the caribean islands are the consequences of these faults.?
The faults and volcanoes are the consequences of the movement of the Caribbean plate relative to the North American plate.

Most of the Caribbean volcanoes are related to subduction zones. The Haiti quake was due to movement along a strike-slip fault...



The blue line is the subduction zone where the Caribbean plate is subducting beneath the North American plate. The earthquake occurred on one of the yellow lines representing strike-slip faults where the Caribbean and North American plates are sliding past one another.

Tectonics of the Haitian earthquake
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Old 14 Jan 10, 16:51
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Quote:
Originally Posted by JSMoss View Post
USGS was reporting yesterday that the vertical lift on the quake was less then 12 inches hence no tsunami.
Strike-slip faults don't have much vertical displacement... That's why they're called strike-slip faults.
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Old 16 Jan 10, 11:10
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Originally Posted by The Doctor View Post
Strike-slip faults don't have much vertical displacement... That's why they're called strike-slip faults.

Thanks for the info Doc! Interesting and educational!
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Old 16 Jan 10, 13:40
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From New Scentist magazine

Caribbean at risk of more large earthquakes

18:32 15 January 2010 by Kate Ravilious

Quote:
Earthquake experts are warning that the devastating quake that struck Haiti on Tuesday could be the first of several in the region. They say historical records suggest that not all the energy that has built up in the faults running through the Caribbean region was released in this week's tragedy.

Their fear is that enough energy remains in the fault system to trigger another earthquake of the same scale as Tuesday's.
more > http://www.newscientist.com/article/...ef=online-news
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Old 16 Jan 10, 14:02
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Quote:
Originally Posted by The Doctor View Post
The Haiti earthquake is the most powerful temblor to hit this region in over 200 years. The quake was felt as far away as Tampa, Florida and Caracas, Venezuela. It occurred on a left-lateral strike-slip fault system at the boundary of the Caribbean and North American plates. The Caribbean plate is moving eastward relative to the North American plate.





The green lines represent transform (strike-slip) faults, the magenta lines are subduction zones on the maps above.

The map below shows the shake intensity. Red is just about as bad as it gets...



The epicenter of this quake coincides with the most populated part of Haiti...



The red and orange contours are areas in which the Modified Mercalli Intensity ranged from 8 to 10. Vulnerable buildings will suffer heavy to very heavy damage at an MMI of 8 and higher. More than 2,200,000 people (~25% of Haiti's population) live in the area subjected to an MMI of at least 8.


USGS: Magnitude 7.0 - HAITI REGION
While i might sympathize and appreciate the facts and figures you provide and the concern demonstrated for the victims; my greater concern lies and is directed toward the Yellowstone issue. Any late breaking word there?

Thanks.
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Old 24 Jan 10, 10:42
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Over 900 quakes and counting. Highest so far just over 3 Richter. If it blows, we won't survive it...if the scientists are right.
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Old 25 Jan 10, 08:39
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Originally Posted by Thunder Dome View Post
While i might sympathize and appreciate the facts and figures you provide and the concern demonstrated for the victims; my greater concern lies and is directed toward the Yellowstone issue. Any late breaking word there?

Thanks.
I don't think we'll get much warning when (or if) Yellowstone erupts.
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