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Re: Quake and shake on eastern seaboard

I was working on models in the workshop at the Museum here and the brass rods 
we use for mounts were swaying in their racks, but no damage at all.


On Aug 23, 2011, at 2:38 PM, Scott Hartman wrote:

> I hope everyone (and the many important collections) on the East Coast
> escaped injury.  I just spoke to some people in downtown Milwaukee who
> felt it (and where unaware of the eastern seaboard quake until I told
> them).  Presumably such a large range of people feeling the quake
> results from it being such a shallow one?
> -Scott
> On Tue, Aug 23, 2011 at 1:24 PM,  <GSP1954@aol.com> wrote:
>> Was working on my computer just before 2 PM when there was what seemed to
>> be a strong north-south movement. My 3rd floor abode can bounce to passing
>> traffic but this was far more intense. After a few seconds it stopped
>> (longitudinal P waves me thinks), to be followed by an even stronger more 
>> vertical
>> motion (shaking S waves I presume). Is a near surface 5.8 out of northern
>> Virginia that was felt as far as NYC. Because the ground is harder on the 
>> east
>> coast quake motions are transmitted much further than on the softer ground
>> west coast. It is possible that these are Pleistocene quakes resulting from
>> crustal adjustments in response to the current lack of glacial mass to the
>> north. If a really big one hits we are toast due to lack of earthquake codes.
>> Is the first quake I have ever actually felt. Reminds me of earlier this
>> summer when at Jim Farlow's Pipe Creek screening we watched and felt 16 
>> tonnes
>> of Amfo (same fertilizer-kerosene mix used by McVey) to blast off 50,000
>> tonnes (weight of an Iowa class battleship) of a limestone quarry wall from
>> almost half a mile away, producing immediate stong vertical shaking followed
>> two or three seconds later by modest rumbling roar.
>> Of course this is trivia to west coasters.
>> GSPaul </HTML>
> -- 
> Scott Hartman
> Scientific Advisor/Technical Illustrator
> (307) 921-9750
> website: www.skeletaldrawing.com
> blog: http://skeletaldrawing.blogspot.com/

Jason Brougham
Senior Principal Preparator
American Museum of Natural History
(212) 496 3544