The 5.3 magnitude quake was centered about 90 miles north-northeast of Bucharest at a depth of 83 miles.
It punctuated two weeks of an earthquake swarm near the Moldovian border that has cracked the ground and structures, causing alarm.
Local residents complained of a constant sound of boiling water coming from the ground and a strange smell of sulfur in the air as the ground “moves up and down” several times a day.
The affected Galati region is not known for strong seismic activity, and the recent tremors of up to magnitude 3.8 are unprecedented, according to locals.
Some blame oil exploration in the region, but the head of the country’s National Institute for Earth Physics told reporters on Monday that such activities are not responsible.
The mayor of Slobozia Conachi, Ion Neculau, says he is not convinced the phenomena are actual earthquakes.
He calls them "land movements," noting the landslides that have taken place in the past. But Romania-Insider reports that those slides ended in 1997 after the formation of underwater "bubbles," which triggered the landslides, ended.