[irised] Another example of the advantages of filtering

[John or Jan Lahr]

Apparently Alan's site is blocked by some school filters!  If so, you 
can see Alan's records on this page as well.

http://jclahr.com/science/psn/as1/filtering/index.html

Cheers,
John

At 08:46 AM 4/4/2007, you wrote:
>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/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.
>