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AS i had stated in the original yellowstone thread..
the USGS said the last time the uplift and mag was of this concern was 1980
Also when Mt St Helens blew its top..
Interesting, are we keeping an eye on St. Helens?
It looks like it clipped the reader as well - in other words, the seismograph was not built to get that large of a reading, check out how the waveforms are clipped at the top - the same thing happens in audio work.