<HTML><HTML>Jeff, This may not be very helpful, but I remember people talking about being able to feel a "thump" when Giantess erupted during the summer of 2000 -- the last summer I was in the Park. As for the URL for the Yellowstone photo files, I save everything and was able to find it on an email from last March. It is: http://www.nps.gov/yell/slidefile/index.htm Sincerely, Dr. Joseph Weixelman</HTML>