Greenwich Emergency Management Coordinator Gary Hill informed committee members Tuesday that residents felt something strange happen underneath their houses the night of Sept. 7.
"Unfortunately, the only thing that showed up so far was a small sinkhole by a storm drain," Hill said.
Barry Glassman, a resident in the 500 block of Dori Place, experienced the event firsthand.
"There was a very loud kaboom and then the earth shook under our houses dramatically to the point where we actually thought it was another earthquake," Glassman recounted at Tuesday's meeting, adding it happened about 7:30 p.m.Glassman said he rounded up his family and headed outside "in socks or barefoot."
"When outside in the rain we saw that all of our neighbors were outside doing the same thing and everybody was yelling 'What was that?'" Glassman said.
Glassman checked with police who reported no explosions from any homes in the area. He also said the shaking could be felt from Dori Place to Greenwich Street within the borders of Wyndham Farm Boulevard and Walter Way.
