On average, between 50 and 60 volcanoes erupt each year around the world. This amount averages nearly one volcanic eruption per week.Know More
Sometimes, one volcanic eruption can trigger other eruptions in volcanoes that are close by. Generally, the larger a volcano is, the more likely it is that its eruption will trigger other volcanoes into erupting at around the same time.
Most often, volcanic eruptions are brought on by earthquakes or tectonic movement. For example, in 1868, a large earthquake hit the island of Hawaii. The earthquake was almost immediately followed up by a small eruption from Kilauea's southwest rift zone. During that volcano, the Kilauea Iki crater filled with lava.Learn more about Volcanoes
Some facts about composite volcanoes include the fact that some of the best-known mountains around the world are composite volcanoes. This list includes Mount Fuji in Japan, Mount Hood in Oregon and Mount St. Helens and Mount Rainier in the state of Washington.Full Answer >
There are more than 550 active volcanoes in the world, almost all of which are located at convergent tectonic plate boundaries. This includes all of the volcanoes in the Pacific Ring of Fire, such as Japan's Mount Fuji, as well as Mount Saint Helens, Popocafepetl in Mexico and Azul in the Andes Range.Full Answer >
According to the Global Volcanism Program at the Smithsonian Institution, as of December 2014, there have been a little over 400 confirmed eruptions in the world since January 2004. These eruptions range on the Volcanic Explosivity Index, or VEI, from 0 up to 5. A VEI of 0 to 1 is very small, while 5 is classified as very large.Full Answer >
According to the U.S. Geological Survey, geologists have identified four types of volcanoes. Cinder cones are the simplest type of volcano, followed by shield volcanoes, composite volcanoes and lava domes.Full Answer >