Subscribe | UPI Odd Newsletter Subscribe CLINTONVILLE, Wis., March 23 (UPI) -- The repeated booming sounds and vibrations reported by residents of a Wisconsin town were caused by "microquakes," officials said. Clintonville City Administrator Lisa Kuss said the U.S. Geological Survey's traveling portable arrays for recording seismic activity detected a magnitude 1.5 earthquake in the town around 12:15 a.m. Tuesday, The (Appleton, Wis.) Post-Crescent reported Friday. Advertisement "The mystery is solved. We have experienced an earthquake here in Clintonville," Kuss said Thursday. The U.S. Geological Survey said the "microquake" was likely one of a "swarm" that have been shaking the town and causing loud booming sounds since Sunday. Kuss said the loud booming was likely the result of the soil and granite under the city. The administrator said officials have not yet decided whether to go forward with a $7,000 plan to have engineering firm Ruekert & Mielke Inc. bring in equipment to study the phenomenon.
