But the rockfalls are caused by fissures opening up, apparently due to ground being forced upward from the caldera.

If the caldera erupts, park closures will be the least of anyone's problems.

>Scientists cannot predict volcanic eruptions.

As I just said in post 6, I don't ACTUALLY think the world is gonna end today, and no experts are actually predicting that. I would have hoped that my sarcastic thread title would have made that clear.

However, the statement "scientists cannot predict volcanic eruptions" is simplistic and misleading. An enormous amount of effort has gone into studying the dynamics of the Yellowstone caldera in recent decades, and by now we know quite a lot about how it works.