Volcanoes that have erupted within the last decade include Bulusan in the Phillippines and Copahue, which is near the border of Chile and Argentina. Some volcanoes, such as Kilauea in Hawaii and Mount Etna in Italy, have been erupting more or less continuously for decades.
There are about 1,500 active volcanoes worldwide, but not all of them are erupting. Some indicate that they are active by gas emissions or by unusual seismic activity. In cooperation with the United States Geological Survey's Volcanic Hazards Program, the Smithsonian Institute's Global Volcanism Program distributes a weekly report which provides notices on volcanic activity around the world.Learn More
The three stages of a volcano are active, dormant and extinct. An active volcano is either erupting or showing signs that it is going to erupt, such as emitting gas. A dormant volcano is not active, but it could become active again, and an extinct volcano is unlikely to erupt again.Full Answer >
Quiet eruptions are volcanic eruptions that explode gently, with broad sheets of slowly flowing lava. Shield volcanoes, such as those in Hawaii, are commonly associated with quiet eruptions.Full Answer >
Volcanic craters and calderas differ mainly in the way they are formed. Craters tend to be more nearly circular than calderas, and they are often, though not always, smaller than calderas. Craters are the vents through which gas, magma and tephra are ejected, while calderas form as a result of local collapse of the surrounding rock.Full Answer >
There are three places a volcano can occur: at mid-ocean ridges, at subduction zones where a continental and ocean plate collide, and at a hot spot located in the middle of a plate. Mid-ocean ridges are caused by divergent tectonic plates and are the most volcanically active feature on earth.Full Answer >