East Coast Earthquake 8-23-2011
r.engehausen at gmail.com
Thu Aug 25 05:53:41 UTC 2011
On 8/24/2011 7:18 PM, Sean Donelan wrote:
> On Wed, 24 Aug 2011, Leigh Porter wrote:
>> Indeed, we are not going to be building earthquake proof buildings in
>> London for example.
> Of course there is no such thing as earthquake proof. The Earth is
> still a single point of failure :-)
> Essential facilty design usally takes the "standard" design
> probabilities for various hazards (heat, cold, wind, rain, earthquake,
> etc) and multiplies it by a larger safety factor. It doesn't mean
> designing for
> the most extreme situation possible anywhere. You've got to rely on the
> geologists and structual engineers to know their stuff.
> In any case, its still just a probability. No matter how small the
> probability, any facility can still have a failure. Have a backup plan
> somewhere else with a different set of hazards.
Many years ago I was taught that "earthquake proof" means the building
doesn't kill the occupants and not that the structure survives
unscathed.. As examples, they used a hospital that was damaged in the
magnitude 6.6 Sylmar quake of 1971 The building was basically destroyed
but only four people were killed.
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