The U.S. Geological Survey confirms one of the booms in Clintonville was a 1.5 magnitude earthquake. It was at 12:15 a.m. Tuesday.
Click here to view the report.
Clintonville administrator Lisa Kuss said Thursday an engineering firm will install four ground seismology monitors around the city to determine whether there's an epicenter to the noises that seem to be underground. Ruekert & Mielke, of Waukesha, will analyze the data once engineers get a good reading. Kuss says it's not known how long that will take. She says the city will spend up to $7,000 on the effort.
Meteorologist Chad Franzen offers up a few suggestions on what it may possibly be in his latest blog. You can read more about that by clicking on his blog here-> Chad Franzen's blog.
The Associated Press contributed to this report.