Hi Petra - Obsidian Butte does like to swarm occasionally - Did you know there are fumeroles at that site? And not far away great 'mud pots' where gases bubble up into mud and create these little mini volcano shaped structures - I guess something has to be responsible for all that geothermal power generated down there.

I'll bet there's no 4.0 or better there - its rather like the geysers in that respect.

Thanks for the update and the good words in the other post - glad to have you here too.

Canie