Chris -

IRIS has published software suitable for a PC that allows you to download
data from the IU and other networks.  The program is written in JAVA. And
very useable although there is a learning curve for proficiency. The program
is called VASE, and the link for the program is
http://dmc.iris.washington.edu/manuals/

Another source for IRIS data is Wilber II at the following link
	http://www.iris.edu/cgi-bin/wilberII_page1.pl

You can download files in SAC binary format and once downloaded you can
resave as PSN Type 4 files and filter to your heart's content.

Bob Hancock
Three Points, AZ
	

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of John or Jan Lahr
Sent: Tuesday, September 12, 2006 12:13
To: psn-l@..............
Subject: Re: Long-period vs short-period instruments

Hi Chris,

I'm just displaying images that are generated at the USGS Albuquerque 
Seismic Lab
(ASL).  The 10 to 40 s band would be an interesting comparison, but I 
don't have the raw data
to generate such a plot.  I the data is available from 
ASL:  http://www.liss.org/software/connect.htm
so someone with the right filtering software could generate such a plot.

Cheers,
John

At 08:37 AM 9/12/2006, you wrote:
>In a message dated 2006/09/12, JohnJan@........ writes:
>
>>A few times the question has come up about which events can be seen
>>on short period versus a long period instruments.
>>
>>I've set up a page with images of the broad-band station COR, which
>>is run by the USGS
>>and Oregon State 
>>University:  http://www.jclahr.com/science/psn/cor/index.html
>>
>>Clicking on this image toggles between short-period- and
>>long-period-filtered versions.
>
>
>Hi John,
>
>        Not many of us have instruments which go to 1000 sec. Can 
> you show us what the 10 to 40 sec band looks like in comparison, please?
>
>        Regards,
>
>        Chris Chapman


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