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There are more than a couple of faults in the area, so I'm guessing the park gets it's fair share.

The volcanic activity in the whole coastal range is due to the subduction of the Pacific plate pushing under the North America plate. There is a lot of rattling and shaking due to that, too.

It's a geologically really active area, with several really large (planetary sized) things happening. It might be a really good place or a really bad place to be in a disaster movie :)