On Monday (today), at least 28 pyroclastic flows – surges of hot ash and gas that rush down the side of the mountain at high speed – crashed down the flanks of Sumatra’s Mount Sinabung.
At least 3,000 people living near its slopes have had to leave, including 1,200 on Monday alone. Many more are expected to evacuate in coming days.
Gede Suantika, an Indonesian government volcanologist, said there were signs a lava dome was growing on Mount Sinabung.
Lava domes are pile-ups of magma near the vent at the top of a volcano, that have been known to collapse and flow down mountain sides at high speed.
According to volcanodiscovery.com, the lava dome continues to grow at a rate of approx 100,000 cubic meters per day.
Before 2010, the volcano had been dormant for more than 400 years.
Thanks to Dean Koehler for these links
According to volcano.si.edu, “Sinabung resides NE of the closest margin of Toba caldera, the largest volcano of this type known on Earth.”