Empathy List Archives

HM

Hal Murray

Sun, May 20, 2012 1:09 AM

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

--
These are my opinions. I hate spam.

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 -- These are my opinions. I hate spam.

R

Rex

Sun, May 20, 2012 2:55 AM

I was at the USGS open house for a couple hours. My first time to go.

Was also my first time to see a commercial choke ring GPS antenna up
close. Was interesting to see the antenna shifted a few inches and
causing a step function on the internet screen where they where
monitoring it along with a few permanent logging station antennas that
were (fortunately) stable while we were watching.

Also enjoyed seeing a hand held XRF Spectrometer (Xray Fluorescence) for
identifying the material in random samples. And good to chat with the
guy who carried it around Afghanistan for the last few years helping
(the Afghanies?) learn what neat stuff their country contains. He also
had an entertaining story about shopping for silver items -- "90%
silver, sir." He pulls the XRF out of his pack and scans to find more
like 20% silver.

Quite a few interesting discussions with several people around the
place. Also bought a nice large wall map of California with nice relief
view of the mountains for $9.

Well worth the drive from San Jose.

On 5/19/2012 6:09 PM, 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

I was at the USGS open house for a couple hours. My first time to go. Was also my first time to see a commercial choke ring GPS antenna up close. Was interesting to see the antenna shifted a few inches and causing a step function on the internet screen where they where monitoring it along with a few permanent logging station antennas that were (fortunately) stable while we were watching. Also enjoyed seeing a hand held XRF Spectrometer (Xray Fluorescence) for identifying the material in random samples. And good to chat with the guy who carried it around Afghanistan for the last few years helping (the Afghanies?) learn what neat stuff their country contains. He also had an entertaining story about shopping for silver items -- "90% silver, sir." He pulls the XRF out of his pack and scans to find more like 20% silver. Quite a few interesting discussions with several people around the place. Also bought a nice large wall map of California with nice relief view of the mountains for $9. Well worth the drive from San Jose. On 5/19/2012 6:09 PM, 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 > >

MD

Magnus Danielson

Sun, May 20, 2012 2:56 AM

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

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

D

DaveH

Sun, May 20, 2012 3:27 AM

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@febo.com
[mailto:time-nuts-bounces@febo.com] On Behalf Of Hal Murray
Sent: Saturday, May 19, 2012 18:09
To: time-nuts@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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To unsubscribe, go to
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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@febo.com > [mailto:time-nuts-bounces@febo.com] On Behalf Of Hal Murray > Sent: Saturday, May 19, 2012 18:09 > To: time-nuts@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. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

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USGS: GPS for seismic work