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I knew that the minute I said I'd be back to a "regular" posting schedule that I would fail miserably, so maybe the less said, the better. Cerro Galan caldera in Argentina (taken from space). Thanks to all the readers who have been avidly discussing a number of fascinating topics over the weekend. I have seen/read a little bit about the tectonic-forcing mechanism idea for some caldera-style eruptions. The biggest thing to keep in mind is that the caldera-forming event - that is to say the collapse of the roof into the chamber - isn't usually the "trigger" as much as a result of a large…