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Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought

 
phocuss
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11/09/2012 08:26 AM
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Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought
The surprise magnitude-5.8 earthquake that stuck central Virginia and rattled cities up and down the US East Coast last year was a record-breaker in more ways than one. Not only was it felt by more Americans than any previous tremor, it triggered landslides over a wider area than any other recorded quake anywhere in the world, scientists say. A detailed analysis of ground motions triggered by the event also indicates that Washington DC and other affected population centers could be at a higher risk of major ground movement than previously recognized.

read more: [link to www.scientificamerican.com]

The culprit behind the extensive shaking appears to be geologic structures within the Appalachian Mountains, whose gentle curves reflect the twisted remains of ancient continental collisions. The Appalachian bedrock seems to channel seismic energy parallel to the mountain's north-south orientation, according to several studies presented during the same GSA meeting session, while fractures, faults and other structures impede travel perpendicular to the range.

[link to www.ouramazingplanet.com]
indiandave

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11/09/2012 08:32 AM

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Re: Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought
It was weird feeling the earthquake last summer. The east coast isn't ready for a really big one. Thanks for posting this.
phocuss (OP)

User ID: 21626989
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11/09/2012 08:38 AM
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Re: Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought
It was weird feeling the earthquake last summer. The east coast isn't ready for a really big one. Thanks for posting this.
 Quoting: indiandave


It was quite a scare! I'm about 30 miles from the epicenter.

hf
phocuss (OP)

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11/09/2012 08:46 AM
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Re: Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought
Here's the geologic map of central VA showing the location of the 2011 EQ on the Spotsylvania fault.

[link to www.nbc12.com]
phocuss (OP)

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11/09/2012 09:03 AM
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Re: Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought
History of Virginia earthquakes:

[link to earthquake.usgs.gov]
Anonymous Coward
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11/09/2012 09:37 AM
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Re: Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought
I live in Stafford I was in Richmond during the quake my cousin was having surgery during the quake talk about bad luck.
Anonymous Coward
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11/09/2012 09:41 AM
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Re: Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought
Also I read the entire research article they were talking about retrofitting buildings to make them safer. I got a sense they are expecting a higher magnitude and are extremely worried.
Laura Bow

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11/09/2012 09:42 AM
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Re: Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought
Wow, very interesting!
phocuss (OP)

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11/09/2012 09:50 AM
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Re: Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought
Wow, very interesting!
 Quoting: Laura Bow


hf
Sledster
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User ID: 982167
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11/09/2012 09:56 AM

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Re: Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought
I was in Richmond near the airport at the time.

It was truly exciting. Never had so much fun in my life!

Sounds wierd, I know, but it was so cool!
I'm tired of waiting, somebody push the damn button already!

Please ignore the German flag, I am an American.

Keep your 72 virgins, give me one old biker chick.
MARsSPEED

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11/09/2012 10:01 AM
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Re: Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought

MSM Sucks!

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