@mark noble,
that's about 20 times atmospheric. (atm is about 110K PA) so, for one atmosphere per 10 meters, its like being at a depth of about 700 feet.
We usually get nervous when pressures are in the 10's of GIGApascals.
Im not saying an eruption isn't reportedly due, theres been a projected window of occurrence of +/- 5 years from USGS data in 2011.
So far though, no seismics or harmonics hve been recorded as afr as Im aware.
We could be waiting another 30 years and still only get a relatively mild eruption.
Was there ever any collapse in the 1707 caldera? I don't think so.