Why are some volcanoes more explosive than others?
Some volcanic eruptions are explosive and others are not. The explosivity of an eruption depends on the composition of the magma. If magma is thin and runny, gases can escape easily from it. When this type of magma erupts, it flows out of the volcano.
Which is the best example of a quiet volcano eruption?
The quiet type of eruption is perhaps better understood, since its activities are more gentle, and therefore can be more closely studied than the explosive type. A great example of this type, other than Kilauea mentioned earlier, is Mauna Loa also in Hawaii.
Which is more explosive a basaltic volcano or a mafic volcano?
The escape of gases may produces tremendous force in a volcano, producing explosive eruptions. In general, the more felsic the magma the greater the volatile content. So mafic/basaltic volcanoes are fairly quiescent, intermediate/andesitic volcanic eruptions are moderately explosive, and felsic/rhyolitic volcanoes may be extremely explosive.
How does an effusive eruption differ from an explosive eruption?
Effusive Eruptions. Explosive Eruptions Explosive eruptions occur where cooler, more viscous magmas (such as andesite) reach the surface. Dissolved gases cannot escape as easily, so pressure may build up until gas explosions blast rock and lava fragments into the air!
Are there any volcanoes that do not erupt?
However, the eruption story isn’t that simple. Some volcanoes erupt with a loud explosion, while others spurt lava continuously or at intervals, but more peacefully. There are very few volcanoes that do not erupt, but are considered active nonetheless.
Can a volcano eruption at one volcano trigger an eruption at another?
There is no definitive evidence that an eruption at one volcano can trigger an eruption at a volcano that’s hundreds of kilometers/miles away or on a different continent.
How is the style of eruption of a volcano related?
Introduction. The style of eruption (quiet lava flows versus violent explosions of gases, ash, and debris) and frequency of eruption are related to the viscosity and amount of dissolved gas in the magma. Hot, runny magmas with little dissolved gas tend to flow smoothly out of vents and produce broad gentle volcanoes.
Some volcanic eruptions are explosive and others are not. The explosivity of an eruption depends on the composition of the magma. If magma is thin and runny, gases can escape easily from it. Pressure builds up until the gases escape violently and explode.
Which volcano type is more dangerous?
Because they form in a system of underground conduits, stratovolcanoes may blow out the sides of the cone as well as the summit crater. Stratovolcanoes are considered the most violent. Mount St. Helens, in Washington state, is a stratovolcano that erupted on May 18, 1980.
Which volcanoes are erupting right now?
Current Eruptions
| Volcano | Country | Max VEI |
|---|---|---|
| Etna | Italy | 2 |
| Bezymianny | Russia | 3 |
| Reventador | Ecuador | 2 |
| Ibu | Indonesia | 1 |
What are the hazards associated with volcanoes?
Lava, gas, and other hazards. The list of hazards associated with volcanic eruptions is long and varied: lava flows, explosions, toxic gas clouds, ash falls, pyroclastic flows, avalanches, tsunamis, and mudflows.
Why are some volcanoes more hazardous than others?
There are several reasons that influence volcanic hazards, these include the viscosity of the magma, proximity to population centres, materials that are ejected from the volcano, the magnitude of the eruption and the plate margin that the volcano rests upon.
What are the top 10 deadliest volcanoes?
Top 10 Most Beautiful & Deadly Volcanoes World’s 10 Most Deadly Volcanoes 1. Mount Bromo, East Java 2. Arenal Volcano, Costa Rica 3. Mount Yasur, Vanuatu 4. Mount Etna, Sicily 5. Cotopaxi Volcano, Quito 6. Krakatoa, Indonesia 7. Kilauea, Hawaii 8. Mount Fuji, Japan 9. Mount Kilimanjaro, Tanzania 10. Osorno Volcano, Chile
What is the main reason why volcanic ash is dangerous?
Unlike the ash produced by burning wood and other organic materials, volcanic ash can be dangerous. Its particles are very hard and usually have jagged edges. As a result, it can cause eye, nose, and lung irritation, as well as breathing problems .
How are volcanoes formed and what causes them to erupt?
Volcanoes erupt when molten rock called magma rises to the surface. Magma is formed when the earth’s mantle melts. Melting may happen where tectonic plates are pulling apart or where one plate is pushed down under another. Magma is lighter than rock so rises towards the Earth’s surface. As the magma rises, bubbles of gas form inside it.
Can a large earthquake cause a volcano to erupt?
Italy’s Campi Flegrei volcano has been showing signs of unrest for over 60 years. Can earthquakes trigger volcanic eruptions? Sometimes, yes. A few large regional earthquakes (greater than magnitude 6) are considered to be related to a subsequent eruption or to some type of unrest at a nearby volcano.
What do you call the magma that erupts from a volcano?
Magma that has erupted is called lava. Some volcanic eruptions are explosive and others are not. The explosivity of an eruption depends on the composition of the magma. If magma is thin and runny, gases can escape easily from it.