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I remember reading that in Detroit, we could expect about 2 feet of ash. -That's an interesting thought. This caldera erupts every 600-700k years, and it last erupted 640,000 years ago (http://en.wikipedia.org/wiki/Yellowstone_caldera). So, it seems to me that earth-bound humans will experience a large die-off in the next 50,000 years or so, whether we do it for ourselves or not.
All seems quiet at the moment, however: http://www.seis.utah.edu/req2webdir/recenteqs/Maps/Yellowsto...