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.
There is a lot of cultural noise around Corvallis, so often the 
short-period record shows
nothing while the long-period record clearly picks up a distant earthquake.

Cheers,
John


#################################/ John C. Lahr
################################/ Emeritus Seismologist
###############################/ U.S. Geological Survey
==========================/ Central Region Geologic Hazards Team
#############################//#################################
############################//##################################
                              PO Box 548  /###################################
              Corvallis, Oregon 97339 /===============================
              Phone: (541) 758-2699 /####################################
                Cell: (541) 740-4844 /#####################################
              Fax: (928) 569-0113 /######################################
                     jjpub@........ /#######################################
                                  http://jclahr.com/science/


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