The U.S. Geological Survey have responsibility for the entire world; they just don't have the density of stations they need ... to precisely locate small activity.

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I'm kind of thinking there is some potential for a somewhat larger quake. What that means is really hard to say. I'm not comfortable thinking we've seen the biggest one yet, but if history is any guide, it's not going to get much bigger.

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The swarm is a little unusual, but we don't know that it's unusual enough for people to be worried.

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