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Divergent plate boundaries in oceans Two ocean plates move apart from each other. Hot upwelling mantle material forms magmas that continuously produce new oceanic crust. An ocean widens.
Krakatoa explodes In the afternoon of 17 Oct, a particularly violent explosion occurred at Anak Krakatau, blasting away a portion of the southern crater rim. A similar event might have been the final trigger for the catastrophic landslide that let the cone collapse and cause a devastating tsunami on 22 Dec 2018.
Latest VAAC alerts The Volcanic Ash Advisory Centers provide near-real time global monitoring of volcanic ash plumes for aviation. Read the latest (or browse past) advisories.
Volcano tour 11-16 Feb 2019: short-notice special tour to see the ongoing eruption of Karangetang volcano in northern Indonesia. Starting and ending in Manado. Small group 2-6 people, experienced volcano expedition leader from our team (Andi).