Geologic settings in the two areas are quite contrasting, with Mount Cameroon being an active volcano made up of younger basaltic rocks (<3 Ma).
Experts say Sinabung has been studied less than more active volcanoes, making it more difficult to predict.
Volcano observatories can monitor local earthquake activity and the surface deformation of a potentially active volcano and make useful, if not yet precise, forecasts of eruptions.
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That population has grown over recent years to about 600,000, making the periphery of Mount Vesuvius, which encompasses a significant chunk of the Naples metropolitan area, among the most crowded of any active volcano -- and making emergency evacuation a big, big problem.
According to the agency there are more than 100 active volcanoes in Japan making it one of the most seismological volatile places on earth.
It's also located at the foot of the active volcano Mount Etna which makes for an excellent daytrip and, as the city is wedged between mountains and the coast, in early spring (snow permitting) you can even ski in the morning and be on the beach in the afternoon.
The Kilauea Volcano, on its southern shore, is the most active volcano of the five that make up the Big Island.
Matches and white sugar are among the products made with sulphur hewn by hand from an active volcano in Indonesia.
