The Meteorological Agency raised the warning level on another volcano Tuesday, exactly a week after a dramatic eruption at another peak killed one man, injured nearly a dozen others and stranded scores of skiers for several hours.

The agency elevated the warning on Mount Zao, a cluster of volcanoes on the border of Yamagata and Miyagi prefectures whose highest point is 1,841 meters (6,040 feet), to 2 from 1, meaning people should avoid going near the crater.

"There is a possibility of a small-scale eruption," the agency said in a statement, noting that a number of small earth movements were detected Tuesday, along with a slight bulging of the ground in one area.