INDONESIA – PVMBG raised the alert level of Indonesia’s Dempo volcano to 2 (waspada, “watch” on a scale of 1-4) because of increased seismic activity (mainly tremor and volcanic-tectonic earthquakes). It is recommended not to approach the crater within 1 km. The volcano’s crater contains a large acid lake and a very active hydrothermal system. Phreatic or phreatomagmatic explosions could occur any time and would pose a significant risk. The last eruptions in 2006 and 2009 were both phreatic. –Volcano Discovery

Piton de la Fournaise volcano (La Réunion) activity update: unrest, eruption warning

A new eruption could be on its way at the volcano. A sharp increase in volcanic CO2 emissions, significant deformation of the Dolomieu crater, and a migration of earthquakes from deep to shallow (7 km) levels, as well as earthquakes near the surface itself that have appeared over the past weekend suggest new magma is on its rise to a possible new eruption, which would be the second in 2015. The prefecture raised the alert to level 1 (“eruption likely”) and closed access to the Enclos Fouqué this morning.

The volcano observatory considered two scenarios most likely: – Magma has risen from a deep source and is now close to the surface, ready to produce a new eruption. Or – Magma has risen from a deep source but stopped at approx. 2 km depth, but destabilizes pockets of older magma in shallower areas, which creates the observed seismic activity. The next days will probably give an answer to what is happening. –Volcano Discovery

Dukono volcano (Halmahera, Indonesia) activity update

The volcano continues to produce significant ash emissions – a plume extending 20 nautical miles E was observed Saturday (Darwin VAAC). Source