Photo: NASA satellite image of Gamkonora volcano.

The Volcanology Society of Indonesia (VSI) issued a 3/4 eruption alert for the Gamkonora volcano yesterday morning. Increased earthquakes and the degassing plume from the summit crater, which has turned dark, sent up warning signals to officials.

The seismicity has shown significant changes with the appearance of harmonic tremor, low frequency "tornillo" type earthquakes (known from Galeras volcano in Colombia to often precede explosions), repo...

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