On 05/20/2012 03:09 AM, Hal Murray wrote:
It wasn't hard to find the right people at the Open House.
GPS is interesting for big quakes.
Most seismometers measure acceleration. It's a double integration to get
displacement which is what they are used to working with. Big quakes last
longer which leads normal seismometers to get into troubles with drift. GPS
doesn't have any drift problems. The cross over is somewhere in the mag 7-8
range.
Japan has a large earthquake warning system. On the big tsunami of last
year, they weren't looking for long enough. They estimated 7.9. In
hindsight, they probably could have gotten better data sooner by using GPS.
This news story says that they can see the disturbance in the ionosphere.
http://www.cbc.ca/news/technology/story/2012/04/23/f-tsunami-research.html
Thanks for the report Hal!
I would love to find the papers where they really show that it is the
ionsphere which was affected. Measures could be bias as the old fix
becomes invalid as things move about.
Cheers,
Magnus
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