[time-nuts] GPS, USGS Early Earthquake Warning

Brooke Clarke brooke at pacific.net
Fri Apr 27 12:38:38 EDT 2012


The SF radio stations would broadcast news about after shocks for the Loma Prieta quake and it would take 10 to 30 
seconds (my memory problem on the exact number) after the radio announcement till I felt them.  I have a couple of p 
wave detectors that are supposed to give you some warning that a quake is on the way.

The quake talk was not on line so I watched the one on Climate Change and it's impact on N. California.  Interesting, 
but no human impact data, only wildlife.

Have Fun,

Brooke Clarke

Hal Murray wrote:
> Fun talk at the USGS last (Thur) night:
>    ShakeAlert!
>    --building an earthquake early warning system for California
>    by Doug Given
> He's a good speaker.  If you get a chance to hear him, go for it.
>    http://online.wr.usgs.gov/calendar/
> The video should be up in their archives in a few days.
>    http://online.wr.usgs.gov/calendar/2012.html
> (scroll down to April)
> The basic idea is to detect an earthquake at location X, and then spread the
> word using telecommunications.  Earthquakes propagate at 2 miles/sec so
> phone/internet is much faster.  Ballpark is 30-60 seconds of warning.
> The reason this might be interesting for time-nuts is that he mentioned using
> GPS to supplement seismometers.  The context is that they need the answer in
> a few seconds.  I didn't catch any details.
> It's unlikely that they are doing any fancy post-processing.  I suppose it's
> possible that they have streamlined the traditional post-processing setup so
> that they can do it in a few seconds.  Maybe that is mostly getting an early
> look at the data the traditional post-processing processing uses.

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