Hi:
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.
http://www.prc68.com/I/Seismometer.shtml
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
http://www.PRC68.com
http://www.end2partygovernment.com/Clarke4Congress.html
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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