Thank you for an amazing story, beautifully illustrated!
I've lived in California most of my life, but I did not know about the Old Faithful geyser! Next time I'm traveling up through that part of the world I will make a point of stopping in for a look.
The bit about earthquake foreshadowing is also quite fascinating! I lived through the Sylmar earthquake in 1971, and it is interesting to me that there would be advance telltale signs in the timing of a geyser...
Nice post!
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Yes, somehow the earth movements may affect the underground plumbing.