Sinabung (Sumatra, Indonesia): During the past days, explosions and pyroclastic flows - often occurring together - triggered by collapses of the lava dome have been more frequent and more intense than during most of the past months.
The largest events produced ash columns reaching 4-5 km altitude and flows traveling up to 3-4 km length, in particular those on 29 Oct at 02:00 local time, 30 Oct at 09:15, and 31 Oct at 14:45.
However, there are no signs that the rate lava extrusion itself, continuing at slow pace, has increased. It is more likely that the dome is in one of its recurring phases where enough lava has accumulated to produce increased instability, in turn resulting in more frequent collapse and explosion events.