Out on Oklahoma's flat prairie, Medford, population about 900, is the kind of place where people give directions from the four-way stop in the middle of town.
It seems pretty sedate, but it's not. "We are shaking all the time," says Dea Mandevill, the city manager. "All the time."
The afternoon I stopped by, Mandevill says two quakes had already rumbled through Medford.
"Light day," she laughs. But, she adds, "the day's not over yet; we still have several more hours."
Mandevill may be laughing it off, but Austin Holland, the state seismologist, isn't.