The U.S. Geological Survey on Saturday confirmed that earthquakes shook northwest Waupaca County on at least two occasions earlier this month. The quakes occurred about 7½ miles north of Iola. There were no reports of damage to buildings. Authorities received reports last week from residents in the area who heard rumbling noises and noticed buildings shaking. The U.S. Geological Survey identified a 1.3 magnitude earthquake that occurred at 2:35 p.m. July 7 and a 1.5 magnitude earthquake that occurred at 1:39 a.m. July 15. The quakes occurred at a depth of less than 5 km. The U.S. Geological Survey will continue to investigate reports of earthquakes in the area. The last confirmed earthquake in Waupaca County occurred on March 20, 2012, near Clintonville. It had a magnitude of 1.5 and was linked to a series of mysterious booms that rattled the city for days. Clintonville capitalized on the seismic activity by selling T-shirts that said, “I Survived the 1.5.”