MOUNT MERAPI, Indonesia warned yesterday that its most volatile volcano could erupt at any time and started evacuating some of the thousands of villagers living on the mountain’s slope.
Mount Merapi has seen increased volcanic activity over the past week and officials have raised the alert level for the 9,737-foot-high mountain to the most urgent level, said government volcanologist Surono, who uses only one name.

Also yesterday, a powerful earthquake hit off western Indonesia, briefly triggering a tsunami warning that sent thousands of panicked residents fleeing to high ground. There were no immediate reports of damage or injuries. The 7.7-magnitude temblor struck at a depth of 13 miles off Sumatra island, the US Geological Survey said.
Mount Merapi last erupted in 2006, when it sent an avalanche of blistering gases and rock fragments racing down the mountain that killed two people. A similar eruption in 1994 killed 60 people, and 1,300 people died in an eruption in 1930.
“Officials have predicted that if it erupts, magma would flow to the southern side,’’ said Sri Purnomo, the head of Sleman district on Java island, where Mount Merapi is located.
He said officials were warning some 11,400 villagers living on the mountain’s southern slope to prepare for “urgent evacuation.’’ About 40,000 people live close to the mountain.
Purnomo said camps to take in the evacuees were being set up at buildings and sports fields more than 6 miles away. Hundreds of senior citizens and children have been moved from villages near the slopes of Mount Merapi to Umbulharjo village, where they are being placed in government buildings and tents prepared by local officials.
There are more than 129 active volcanoes to watch in Indonesia, which is spread across 17,500 islands and is prone to eruptions and earthquakes because of its location within the so-called “Ring of Fire,’’ a series of fault lines stretching from the Western Hemisphere through Japan and Southeast Asia.
When yesterday’s earthquake struck, at least five towns in the provinces of Bengkulu and West Sumatra were badly jolted, officials and witnesses said, as were the nearby Mentawai islands.
Areas closest to the epicenter of the 9:42 p.m. quake were sparsely populated, and there were no immediate reports of damage or casualties, said Ade Edward, a disaster management agency official.
A 5.0-magnitude aftershock hit less than an hour after the original quake, and a 6.1-magnitude aftershock was recorded early this morning.
Indonesia’s Mount Merapi erupted three times Tuesday, emitting searing clouds and volcanic ash, a government volcanologist said. “We heard three explosions around 6:00pm [local time], spewing volcanic materials as high as 1.5 kilometers [0.93 miles] upward and heatclouds down on the slopes,” said government volcanologist Surono.
Before the latest eruption, people living in the shadow of Indonesia’s most active volcano had been warned to evacuate or risk being killed. Authorities had put an area 6.2 miles (10 kilometers) around the crater of Mount Merapi on red alert Monday, ordering 19,000 people to flee.
“This eruption is certainly bigger than the 2006 eruption, during which the heat clouds occurred for only seven minutes after the eruption,” Surono said. “Today’s eruption released heat clouds of gas and ash down the slopes for about two hours. We cannot tell you how far the searing clouds went down on the slopes because it’s dark.”
Television footage showed thousands of people fleeing Tuesday’s eruptions in panic, some covered in white ash, as officials with megaphones tried to help them escape the area.
An eyewitness quoted by Associated Press saw up to 20 injured people being rushed to medical treatment.
The 2006 blast Surono referred to killed two people.
Before the latest eruption, officials said nearly 15,000 people had ignored evacuation orders despite several minor eruptions that sent lava spewing down Merapi’s southern slopes.
Many people sleeping in camps returned to their homes during the day to work and tend to their cattle. Some men refused to leave altogether, confident they would be able to escape.
Field coordinator Widi Sutikno, of the Sleman district on the southern slopes of the 9,616 feet (2,914 meter) mountain, said only about 3,700 people out of 11,400 in his area had sought shelter in makeshift refuges.
“We have evacuated many women, pregnant women, sick people, elderly people and children,” Sutikno said. “We let some people return to their fields for their daily activity. But they need to go back to the camps and not their houses.”
Source: boston