VSI raised the alert status to Level 2 (Waspada) after an increased seismic unrest at Ambang volcano in Sulawesi, Indonesia. The remote volcano had its last eruption in 2005, when phreatic explosions occurred.
More than 60 volcanic earthquakes were detected on July 3, 2014, compared to averaged of 1-2 per day during the previous weeks.
A light steam plume could be observed from the volcano's summit, VolcanoDiscovery reports.
The young volcanic dome of Ambang (Credit: VolcanoDiscovery)
The compound Ambang volcano is the westernmost of the active volcanoes on the northern arm of Sulawesi. The 1795-m-high stratovolcano rises 750 m above lake Danau. Several craters up to 400 m in diameter and five solfatara fields are located at the summit. Ambang's only known historical eruption, of unspecified character, took place in the 1840s.
Featured image: GVP
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