Mount Sinabung, a volcano in Indonesia, has erupted more than 200 times in the past week. Twenty thousand local villagers have been displaced.
Here's more about volcanoes in general:
What are the hazards?
When we think of a volcano erupting, most of us think: lava! But in
fact, volcanoes that produce lava, although awe-inspiring, are not as
dangerous as the explosive kind, which shoot out ash and rock fragments.
There are several other potential hazards too, including acid rain,
landslides, rockfalls and mudflows. The latter is not so surprising if
you consider that hot ash or lava can melt snow at the volcano’s summit.
The melted snow mixes with ash and soil to form a fast-flowing mixture
that can power down stream channels. Rainfall can also erode recent
volcanic deposits to produce mudflows.
Volcanic eruptions, which are associated with tectonic forces, are also
sometimes accompanied – if you’re really unlucky – by earthquakes and
Volcano safety tips
If you’re going to be in an area anywhere near a volcano, make sure you do the following:
Before arriving in the area, read up about nearby volcanoes. Find out
whether they are likely to erupt, and, if so, what the associated
hazards are likely to be.
If you’re travelling in a group, always make sure you have a designated
place to meet in case you get separated, and an ‘outside’ phone number
(i.e. one in another, non-disaster area) to call. (This is of course
common sense when tavelling, volcano or no volcano.) As in any area or
situation where there is a risk for natural disaster, it’s a good idea
to listen to regular news broadcasts. Consider carrying a
battery-operated radio, in case of electrical power outages.
If an eruption occurs:
If you have access to a radio or TV, listen to broadcasts and follow
instructions given by authorities e.g. evacuation. If you haven’t been
told to evacuate, or if this is no longer possible or advisable, then
stay put and close all the windows, doors and air vents, and block gaps
e.g. under doors. This is to protect you from ash fall.
If you find yourself stranded outdoors: seek shelter – if not inside a
structure, then behind a barrier that can offer some protection. To
protect yourself from ashfall, wear long-sleeved shirts and long
trousers, and goggles to protect your eyes. Use a dust mask or hold a
damp cloth over your face to help breathing.
Avoid areas downwind and downstream of the volcano, as well as river
valleys and low-lying areas. If caught near a stream, be aware of
mudflows. Move upslope, especially if you hear the roar of a mudflow. If
you see the water level of a stream begin to rise, quickly move to high
ground. If a mudflow is approaching or passes a bridge, stay away from
If caught in a rockfall, roll into a ball to protect your head.
The effects of an eruption can be experienced many kilometers from a
volcano. Mudflows and flash flooding, wildland fires, and even deadly
hot ash flow can reach you even if you can’t see the volcano during an
eruption. Trying to watch an erupting volcano up close is a deadly idea.
After the eruption
Even if the pyrotechnics seem to have abated, continue to listen to
broadcasts, and stay indoors until the authorities advise otherwise.
And, however tempting it might be, this isn’t a good moment to go
sight-seeing. Even under normal (i.e. non-disaster) conditions, it is an
act of unmitigated foolishness to venture close to an active volcano
(and in the case of some of the more dangerous, even 10km is too close)
without an experienced guide.
Stay away from volcanic ashfall areas. If you can’t avoid them, then
continue to keep your skin and face covered to avoid skin and
respiratory irritation. This is particularly important for anyone with a
respiratory condition like asthma or bronchitis. Watch out for roofs
laden with ashfall, as this is surprisingly heavy and can even cause
buildings to collapse. It’s also best to avoid driving in heavy ashfall,
as this can clog the engine.
- (Olivia Rose-Innes, EnviroHealth Expert, Health24, updated by Health24 January 2014)
Safety tips adapted from the American Red Cross. What to do if a volcano erupts. 1998.