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Earthquake!!!

dmc

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Friends from Burlington felt it...

WTF is going on? My friends in Sweden had one last week... Which is rare...
 

Warp Daddy

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We felt it here , we're about 100 miles from tthe epicenter . Rumbling noise furniture shook and other than that no damage . I've been thru this 4 times before since teh St Lawrence Valley is seismically active and we have an earthquake center at one of our colleges . Most are minor shakers in teh 3-5.5 RICHTER RANGE.
 

Puck it

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Earthquakes are quite common in that area. It is called the Canadien Shield. It is a very large mass of igneous and metamorphic rock. Very very old rock. There have quakes in the 6's in the shield. Very little damage happens though. Sparse population and the rock is not a good medium for energy transfer at long distance.
 

noski

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We haven't rocked like that since Phish was at Mt Ellen. ok. Maybe that's a little too much spin.... But we felt it in the MRV.
 

ctenidae

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We felt it here , we're about 100 miles from tthe epicenter . Rumbling noise furniture shook and other than that no damage . I've been thru this 4 times before since teh St Lawrence Valley is seismically active and we have an earthquake center at one of our colleges . Most are minor shakers in teh 3-5.5 RICHTER RANGE.

You know, seismographs and monitoring stations seem to always be clustered arounf active earthquake areas. I think those wiggly needles are causing the earthquakes. You ever notice how many vulcanologists there are around volcanoes? I think something's fishy there.
 

noski

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Good point, and why do the deer and moose refuse to cross at their sign, anyway? It's darn inconvenient when they jaywalk.
 

roark

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Yup, felt it in Keene NH. Ironically I never felt one in 15 yrs in CA! (there were certainly *many* small EQs, I just never felt them)
 

Warp Daddy

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You know, seismographs and monitoring stations seem to always be clustered arounf active earthquake areas. I think those wiggly needles are causing the earthquakes. You ever notice how many vulcanologists there are around volcanoes? I think something's fishy there.

Oh Hell Yeah we blame those guys 2 i mean with alll their damn techno weenee toys and fixations with shakin :D

I always wanted a shaken'bake at nite so you could use the line " was it GOOD 4 u,,, i moved the earth for ya Babe" :D:D
 

Geoff

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I had a call with a company in Ottawa at 2:00. They were about 10 minutes late to the call. I told 'em earthquakes are no excuse. My sister's office is in Ottawa (she commutes from Vancouver every-other week). She said she was 20 miles from the epicenter. Buildings were evacuated but nothing fell down that she saw.
 

thetrailboss

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Earthquakes are quite common in that area. It is called the Canadien Shield. It is a very large mass of igneous and metamorphic rock. Very very old rock. There have quakes in the 6's in the shield. Very little damage happens though. Sparse population and the rock is not a good medium for energy transfer at long distance.

+ 1. They are more common than you think.

Didn't feel a thing in Rutvegas.
 

wa-loaf

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Earthquakes are quite common in that area. It is called the Canadien Shield. It is a very large mass of igneous and metamorphic rock. Very very old rock. There have quakes in the 6's in the shield. Very little damage happens though. Sparse population and the rock is not a good medium for energy transfer at long distance.

At least one building was evacuated in Boston. Some old brick thing. I didn't feel it in Cambridge, but I just saw a seismologist on tv saying the exact opposite that the old hard rock transmits seismic events very long distances.
 

ERJ-145CA

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I heard reports out of Hoboken that there was possibly one there today too....the same one?

CNN said it could be felt as far away as NJ so it was probably the same quake. I was in Manchester, NH today and felt nothing.

I have experienced 3 quakes in the Northeast. 2 in Jersey in the late 80's where the epicenters were in NE Jersey or SE New York I believe. I also felt one in NH (Concord area) somewhere around 2003 or so. My wife and I were at her friend's house on an air mattress and the apartment started shaking. The epicenter of that one was Plattsburgh, NY. All of these were confirmed by news sources later in the day.
 

Puck it

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At least one building was evacuated in Boston. Some old brick thing. I didn't feel it in Cambridge, but I just saw a seismologist on tv saying the exact opposite that the old hard rock transmits seismic events very long distances.


Only certain waves travel the long distances. Here we go

Earthquake have three basic types of elastic waves. Two of the three propagate within the rock itself. The faster of these body waves is called the primary or P wave. this is a compressional wave. P waves are able to travel through both solid rock, such as granite mountains i.e. Cannadien Shield, and liquid material, such as volcanic magma or the water of the oceans. They travel long distances.

The second wave is aslower wave through the body of rock is called the secondary or S wave. As an S wave propagates, it tends to shears the rock sideways at right angles to the direction of travel. It is a transverse wave.Liquids can not propagate this wave.

The speed of P and S waves depends on the density and elastic properties of the rocks and soil through which they pass. The P waves are felt first. The effect is similar to a sonic boom that bumps and rattles windows. This is the wave felt in Brookline. Some seconds later, the S waves arrive with their up-and-down and side-to-side motion, shaking the ground surface vertically and horizontally. This is the wave motion that is so damaging to structures. These do not travel as far either. These waves can also find channels that allow them to travel farther. There is a lot that determines if and where the wave is felt.

The third general type of earthquake wave is called a surface wave, reason being is that its motion is restricted to near the ground surface. Such waves correspond to ripples of water that travel across a lake.

Class over.
 
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