Rumbling Mount Sinabung on the Indonesian island of Sumatra shot billowing columns of ash more than 5,000 meters (16,400 feet) into the atmosphere and hot clouds down its slopes on Monday.
Indonesia's capital Jakarta was rocked Tuesday by a strong earthquake which forced some buildings to be evacuated, but there was no immediate tsunami threat or reported injuries, a government agency said.
Ash from Mount Agung on the Indonesian island of Bali was visible in imagery from NASA's Terra satellite.
A week after authorities put Bali's volcano on high alert, tremors that indicate an eruption is coming show no sign of abating, swelling the exodus from the region to at least 140,000 people.
Comprising more than 17,000 islands, the Indonesian archipelago is one of the world's most biodiverse places on Earth.
Mount Sinabung on the Indonesian island of Sumatra blasted volcanic ash as high as 4.2 kilometers (2.6 miles) on Wednesday, one of its biggest eruptions in the past several months of high activity.
Diminutive humans that died out on an Indonesian island some 15,000 years ago were not Homo sapiens but a different species, according to a study published Monday that dives into a fierce anthropological debate.
US animal rights activists filed an unusual lawsuit on Tuesday on behalf of a macaque monkey who snapped selfie photographs, arguing it owned the photos rather than the nature photographer involved.
A German zoo said Tuesday its keepers had shot dead a panicked orangutan after it escaped its enclosure and threatened to run through city streets.