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One real life example is the 1959 Hebgen earthquakenear Yellowstone National Park. This earthquake raised cliffs over 20 feet high in one area, tilted the ground underlying Hebgen Lake submerging some boat docks while stranding other boat docks, triggered a giant landslide that dumped roughly 1/3 of a mountain into a campground (entombing an unknown number of campers and their vehicles) and damming the Hebgen river. After the earthquake was over, a new lake (Quake Lake) formed between the landslide dam and the manmade earth-filled Hebgen Dam. It was feared that if Quake Lake rose high enough it would reach Hebgen Dam, eroding it and causing it to fail; the resulting deluge would then overtop the landslide dam causing it to fail too; the resulting deluge would then wipeout and flood many towns further downriver that had not previously been affected by the original Hebgen earthquake. At this point the Army Corp of Engineers was called in to work on the problem, they cut a wide trench across the landslide dam to drain Quake Lake so that its level would always stay safely below the base of Hebgen Dam.

You can visit the site of the Hebgen earthquake and see all the things mentioned above, as well as many other dramatic earthquake effects/changes that are omitted here so as not to spoil the surprise.

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