[143956] in North American Network Operators' Group
Re: East Coast Earthquake 8-23-2011
daemon@ATHENA.MIT.EDU (Scott Morris)
Wed Aug 24 08:27:56 2011
Date: Wed, 24 Aug 2011 08:27:14 -0400
From: Scott Morris <swm@emanon.com>
To: nanog@nanog.org
In-Reply-To: <CAP-guGV7McdSnPFnxk99_zrM_h=fSzG5Vs8ZmH1vwTcbFg2WRQ@mail.gmail.com>
Reply-To: swm@emanon.com
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Also, the quake on the east coast was much closer to the surface than
most west coast quakes, which could account for the feeling.
Scott (not a geologist)
On 8/23/11 6:13 PM, William Herrin wrote:
> On Tue, Aug 23, 2011 at 5:48 PM, Owen DeLong <owen@delong.com> wrote:
>> A 5.8 (or 5.9, I've seen conflicting numbers)
> Hi Owen,
>
> http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/se082311a.html#details
>
> Originally reported as 5.8. Briefly upped to 5.9. Now back to 5.8.
>
>> really isn't likely to do all
>> that much damage, even on the East Coast.In California, anyone who
>> has lived here for more than 10 years probably doesn't even feel
>> anything less than a 5, and, it takes a solid 6 to really get anyone's
>> attention out here. Natives mostly won't change their behavior for
>> anything short of a 6.5.
> Two points:
>
> A. Our structures aren't built to seismic zone standards. Our
> construction workers aren't familiar with *how* to build to seismic
> zone standards. We don't secure equipment inside our buildings to
> seismic zone standards.
>
> B. The crust on the east coast is much more solid than on the west
> coast, so the seismic waves propagate much further. Los Angeles
> doesn't feel an earthquake north of San Francisco unless it's huge.
> New York City felt this earthquake near Richmond VA. So yes, we're
> seeing relatively minor damage... but we're seeing it over a much
> wider area than someone in California would.
>
> Regards,
> Bill
>
>
