Indonesia on Monday raised alert status of a volcano located in a densely populated area of Central Java to top alert, and asked for a massive evacuation for more than ten thousands people living in the slope of the mountain, officials said.

The most volatile Mount Merapi of 2,968 meters high has shown increased seismic activity over the past week, head of volcanology observer at the National Volcanology who goes with a single name Kristianto said.

"We have raised the alert status to the higest-level this morning, this means that the mount can erupt at any time," Kristianto told Xinhua by phone.

The agency has asked those living in the radius of 10 kilometers from the slope to leave the area, an official of the observation of volcanology at the agency named only Ngadiono told Xinhua over phone.

"The agency has recommended villagers particularly living at the southeastern of the mount at the radius of 10 kilometers to immediately leave the area," he said.

A preparation has been made for the evacuation of more than ten thousands people living in the slope of the mountain, spokesman of the National Disaster Management and Mitigation Agency Hartje Robert said.

More than 40,000 people lived in the area near the mount.

Mount Merapi last erupted in 2006 that killed two people, after eruption in 1994 that left 60 fatality.

More than one thousands people were killed in its eruption in 1930.

Indonesia, lied on a vulnerable quake hit zones so called the Pacific Ring of Fire, has 129 active volcanoes.