[time-nuts] USGS: GPS for seismic work
Hal Murray
hmurray at megapathdsl.net
Sun May 20 05:22:18 UTC 2012
info at blackmountainforge.com said:
> 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.
Yes, but that's the DC term.
The seismologists and surveyors are real good at using GPS for that. The
standard setup involves post processing.
I'm not a wizard in that area. (not even close)
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Another gadget that I saw was a "two color" laser ranging setup. It was good
for 1 mm over 5 km. (ballpark)
The second color lets them do temperature corrections similar to the way L1
vs L2 does ionosphere delay corrections.
I saw another booth with an antenna picture labeled "12 Mbs". That seemed
off scale for seismic data. When I asked he said it was for relaying many
local sensors to the central data collection setup.
--
These are my opinions. I hate spam.
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