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Re: Quake and shake on eastern seaboard

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?


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/