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The alert level of the volcano was raised today from 1 ("normal") to 2 ("Waspada", "watch") on a scale of 1-4. During the second half of 2014, a strong increase in seismic activity and a 5.5 deg temperature increase of the crater lake water had been detected.
The number of shallow volcanic earthquakes rose from averages of 1-2 per day to approx 10 per day during 20-31 Jan and climbed to more than 100 events since the start of February alone.

This might indicate a shallow intrusion is taking place and could lead to a new eruption. VSI recommends not to approach the crater within 2 km radius. The last eruption of Kelut was in Oct-Nov 2007, when a new lava dome grew within the crater lake.