Grew up in Portland, saw the whole thing from my front yard. I've been up to the mountain many times since, amazing how quickly the landscape is recovering.

Also, viewing the blast zone is useful for me for a professional reason -- as a defense analyst, it's useful to see just what 20MT (more or less) of explosive power can do. Pretty sobering to think we have thousands of those sitting around (to be fair, current warheads are more typically 0.5 MT, the multi-megaton city busters were a 1960s thing).

Here is a list of quakes up to the last hour or so.

http://www.pnsn.org/recenteqs/Maps/123-46_eqs.htm

Here is a real-time plot from a seismometer on the mountain:

http://www.pnsn.org/WEBICORDER/GREEN/SEP_EHZ_UW.2004092712.html

Activity continues and if anything looks to be accelerating -- 5 quakes of > M2.0 in the last two hours.