[time-nuts] USGS: GPS for seismic work
DaveH
info at blackmountainforge.com
Sun May 20 03:27:05 UTC 2012
They also use GPS units for tectonic shift. Put a unit on each plate and
measure the difference between them. When it gets to be a large enough
number, something, somewhere will slip and you will have a quake.
Dave
> -----Original Message-----
> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Hal Murray
> Sent: Saturday, May 19, 2012 18:09
> To: time-nuts at febo.com
> Subject: [time-nuts] USGS: GPS for seismic work
>
> 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-r
> esearch.html
>
>
> --
> These are my opinions. I hate spam.
>
>
>
>
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