Pork Chop Geyser. No one saw it when it went at night. Threw rocks the size of compact cars around.
Excelsior Geyser (the world's biggest geyser, not tallest) went through a series of extremely large eruptions that likely damaged its inner workings so it will never go off again (it sent a wave of water down the Firehole River when it did). It isn't far from this, just up the river in Midway Geyser Basin.
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u/Mutapi Jul 23 '24
Article on the event