No serious injuries have been reported since the initial eruption last Wednesday, but public broadcaster NHK said a woman suffered cuts from shattered glass in Tuesday's blast.

NHK said the eruption was five times larger than the initial activity last week, which was Shinmoedake's first major eruption in 52 years.

Japan's Meteorological Agency has restricted access to the mountain, and on Tuesday broadened the no-go zone to anywhere within a 2 1/2-mile (four-kilometer) radius of the crater. Two lodges and scattered homes are within the perimeter.

Dozens of domestic flights in and out of Miyazaki _ about 590 miles (950 kilometers) southwest of Tokyo _ were grounded last week and more cancellations followed. Train service was temporarily suspended in the area and many schools closed.

The local government also reported damages to crops.

Officials in the town of Takaharu have urged about 1,100 residents who live near the volcano to go to evacuation centers because of the danger of debris, ash and landslides. The warning was not mandatory, however, and some residents were returning to their homes.

Experts said a dome of lava was growing larger inside the 4,662-foot (1,421-meter) volcano's crater, but it was not certain whether the dome would grow enough to spill over the rim and create large flows down the volcano's sides.

Avalanches of superheated gas, ash and rock have already been observed.

The Japanese islands, part of the seismically active Pacific ``Ring of Fire,'' are volcanic in origin and dozens of volcanos still are active. In 1991, 43 people died in the eruption of Mount Unzen, also on Kyushu island.

(AP)