Take a look at some of the helicorders from around the region. Time goes from top of the screen to the bottom.
First I want to show you a helicorder from a calm day two days ago.

Here are the helicorders from this morning across the region. The earthquake happened around 6:34 UTC.
Bloomington, IN:

Carbondale, IL:

Poplar Bluff, MO:

St. Louis, MO:

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