Mounts Soputan, Lokon and Karangetang are active in North Sulawesi province, while Mount Gamalama is showing signs of unrest on Ternate Island and Mount Marapi rumbles on Sumatra.
All five volcanoes produced explosions within a week’s time that sent ash plumes soaring above the summits.
The overnight blast from Mount Soputan was heard by residents nearly 30 miles away.
So far, no nearby residents have been threatened by the blasts, and no evacuation orders have been issued.
Photo: Virna Setyorini - Flickr