Thread: Re: Another example of the advantages of filtering

Started: 2007-04-04 17:17:15
Last activity: 2007-04-05 03:22:52
Topics: IRIS EPO
Craig Messerman
2007-04-04 17:17:15
We picked up the surface waves from one of these, and I was remarking this morning that to see a low 6 from that distance it must be the filters. Very good. Unfortunately, Alan's site is blocked by our school's internet filter. Geology is obsene to some...;)

Craig Messerman
Sentinel High School, Missoula, Montana

"Alan Jones" <AlanJones<at>stny.rr.com> 04/04/07 09:46AM >>>
Earlier John Lahr showed how filtering can make it easy to detect earthquakes. Here's another example.

Check out the two images. They show three earthquakes in the last 24 hours.

http://home.stny.rr.com/alanjones/ASNoFilter.jpg
http://home.stny.rr.com/alanjones/ASFilter.jpg

The filtering is the same as John Lahr commonly uses. You can hardly see the earthquakes until you turn on the filtering.

This is cool. I was able to do this from home because of a beta version of AmaSeis I am using. The computer at the University that is attached to the AS-1 sends an hour file to an FTP site each hour. The AmaSeis on my computer at home downloads them directly into AmaSeis.

The events 6.0 or above in this time span are:

04-APR-2007 11:00:27 -20.73 168.88 6.3 10.0 LOYALTY ISLANDS
04-APR-2007 06:34:34 -7.78 156.49 6.2 10.0 SOLOMON ISLANDS
04-APR-2007 00:39:44 -7.12 156.07 6.0 10.0 SOLOMON ISLANDS (Can't see this one)
03-APR-2007 20:26:14 -20.70 168.86 6.3 41.4 LOYALTY ISLANDS

Alan Jones

Notice: This e-mail may contain confidential information belonging to the sender which is privileged. The information is intended only for the use of the individual or entity named above. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this transmission in error, delete it without copying it and immediately notify the sender by reply e-mail. Thank you.
<<<< GWAVASIG >>>>


  • Craig,

    You wrote:
    ----- Original Message -----
    Unfortunately, Alan's site is blocked by our school's internet filter. Geology is obsene to some...;)

    Instead of my personal web site, I've now loaded them to my web page at the University. See these work better.

    http://www.geol.binghamton.edu/faculty/jones/ASFilter.jpg

    http://www.geol.binghamton.edu/faculty/jones/ASNoFilter.jpg
    The filtering is the same as John Lahr commonly uses. You can hardly see the earthquakes until you turn on the filtering.

    This is cool. I was able to do this from home because of a beta version of AmaSeis I am using. The computer at the University that is attached to the AS-1 sends an hour file to an FTP site each hour. The AmaSeis on my computer at home downloads them directly into AmaSeis.

    The events 6.0 or above in this time span are:

    04-APR-2007 11:00:27 -20.73 168.88 6.3 10.0 LOYALTY ISLANDS
    04-APR-2007 06:34:34 -7.78 156.49 6.2 10.0 SOLOMON ISLANDS
    04-APR-2007 00:39:44 -7.12 156.07 6.0 10.0 SOLOMON ISLANDS (Can't see this one)
    03-APR-2007 20:26:14 -20.70 168.86 6.3 41.4 LOYALTY ISLANDS

    Alan Jones

    Notice: This e-mail may contain confidential information belonging to the sender which is privileged. The information is intended only for the use of the individual or entity named above. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this transmission in error, delete it without copying it and immediately notify the sender by reply e-mail. Thank you.
    <<<< GWAVASIG >>>>

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