Lava spilled at 2:00 am (1900 GMT Wednesday) from a new lava dome that has grown on top of Mount Merapi, which has been on stand-by alert for three weeks, said Muzani from Yogyakarta's vulcanology office.

"The lava flowed for about 200 meters (yards)," he told AFP.

For the first time, a fixed burning spot was also seen from the village of Ndeles, one of the villages highest on the fertile slops of the volcano, from 4:00 am, he said.

Lava outflows and the emergence of fixed burning spots are among signs of imminent eruption, geologists have said.

But Muzani said the status of the volcano remained unchanged for now, at one stage below that which would require mandatory evacuation of those living around it.

Meanwhile, more than 5,000 villagers from around Merapi have left their homes, but preparations are being made to accommodate thousands more, officials said.

Marsono, head of the disaster control office at the Central Java capital of Semarang, said that a total of 37,000 evacuees were expected from the three Central Java districts around Merapi, with only 3,566 already relocating.

"They are all elderly people, especially women, and children. The men prefer to tend to their fields and livestock until the last minute," Marsono said.

An official from Sleman -- the fourth district on the slopes of Merapi, which is part of Yogyakarta province -- painted a similar picture.

"We are readying ourselves to evacuate a total of around 4,500 people," said Widi Sutikno, head of Sleman's disaster control office.

"But so far, we only have about 1,600 people who have agreed to leave their homes," he said.

Local residents place strong trust in the customary guardian of the volcano, an elderly man named Marijan, officially appointed by the royal house of Yogyakarta, some 30 kilometers (around 20 miles) south of the volcano.

He has said that there are no signs yet of an immediate eruption.

A new lava dome has been forming at the peak of Merapi over the past week, signalling that the eruption will involve an outflow of lava and deadly heat clouds rather than a massive explosion, scientists have said.

In its last large eruption in 1994, heat clouds known locally as "shaggy goats" careened down the volcano at more than 100 kilometres (60 miles) per hour, reaching temperatures of 600 degrees Celsius (1,100 degrees Fahrenheit).

The clouds killed some 66 people on the southern slopes of the mountain.

Indonesia sits on the Pacific "Ring of Fire" noted for its volcanic and seismic activity. The country has more than 100 active volcanoes.

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