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Ash explosion at Chillán on 31 Jan 2016 (SERNAGEOMIN)
A series of new explosions with small to moderate ash emissions occurred at the volcano during the end of last week. This activity formed a second new crater, approx. 25×30 m wide and located 50 m beneath the northeast flank of Arrau crater, as SERNAGEOMIN staff observed on an overflight on 30 January.
According to Chilean scientists, the activity is caused by phreatic (steam-driven) explosions in the shallow hydrotermal disturbances, not by fresh magma. Temperatures in the crater areas were found to be relatively low (approx 120 deg C), which supports this interpretation as well. It is likely that more explosions occur in the near future and an exclusion zone of 2 km around the crater was put in place.
Courtesy of volcanodiscovery.com
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