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I'm scratching my head and can't figure it out. I didn't pay that much attention to it at first because I just figured it was a large quake in Japan or nearby. Because I noticed the signal on the Yellowstone graphs as well. But I've looked and there's no listed quake to account for the signal. Nothing in North America, or worldwide. So that one is a mystery. Unless there is some delay in recording the quake and it will show up soon.