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
An erupting volcano emits gases and dust particles that can cause profound changes in weather and climate throughout the world. Volcanism also affects the environment by producing acid rain and making ocean water warmer.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 >
The Earth has approximately 20 known supervolcanoes, according to James Morgan, who write for the BBC News. What constitutes a "supervolcano" is not clearly defined, so the term is avoided in the literature, but it is often used in reference to two distinct phenomena.Full Answer >