...Daddy doesn't sleep at night. I'm not entirely clear on how squeeze-ups form, but I can generally recognize them. My understanding is that once the lava becomes confined within the exterior shell or crust- essentially, a lava tube that hasn't drained- more lava erupted at the top of the flow increases the pressure lower in the tube. If there is a fracture or joint in the area experiencing the increased pressure, the lava squeezes up and out, like toothpaste from a tube.
Photo run through Paint.Net's autolevel routine. August 21, 2011. FlashEarth location.
And for those who didn't catch today's tongue-in-cheek musical reference:
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