Scientists are trying to get a better reading on what's shaking up Clintonville, Wis.
Police dispatchers on Tuesday night received 60 phone calls within 15 minutes after the booms started up again.
Scientists did pick up a 1.5-magnitude quake last week, but the Journal-Sentinel says those instruments didn't register any activity Tuesday. Scientists say high winds may have interfered and that they couldn't rule out an earthquake.
Clintonville city officials are urging scientists to set up more tools to get a better gauge on any seismic activity, the Journal-Sentinel reports.