CLINTONVILLE - Officials in Clintonville, Wis. are struggling Tuesday to find the answers to the mysterious booms that have rocked the city.
Those intense sounds that shook homes and household items continued into Tuesday morning.
"Everybody out there in radio-land should think hard about what it could be, and feel free to help," joked Clintonville City Administrator Lisa Kuss, who talked with Newsradio 620 WTMJ.
"Today, we are going to look back at some additional things in the water utilities. We're also going to talk to the engineers to further look at some geological things."
Kuss tells us that the second evening and early morning of these unexplained explosion-like sounds came in a pattern.
"Starting at approximately 8:00 p.m. last night, there were more rumblings and sounds coming into the same neighborhood. It occurred at 8:00 p.m., 10:00 p.m., then again at 12:00 a.m., 1:00 a.m. and 2:00 a.m.," said Kuss.
"Last night, at 9:50 p.m., it was loud, like get-your-heartbeat-racing loud."
Police received about 150 calls about the booming sounds Monday morning.
Kuss told us that the area where the sounds are coming from grew on the second night.
"The calls seemed to be coming in slightly further south and west than the quadrant that we had yesterday."
One expert theorized that thawing ice underground could be the cause.