What Factors Increase The Likelihood That A Volcanic Eruption Will Be Explosive?


What Factors Increase The Likelihood That A Volcanic Eruption Will Be Explosive??

Although there are several factors triggering a volcanic eruption three predominate: the buoyancy of the magma the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber.Nov 29 1999

What factors make a volcano more explosive?

Explosive eruptions are favored by high gas content & high viscosity magmas (andesitic to rhyolitic magmas). The explosive bursting of bubbles fragments the magma into clots of liquid that cool as they fall through the air. These solid particles become pyroclasts or volcanic ash.

What factors increase the explosive potential of magma during a volcanic eruption?

Temperature of magma amount of dissolved gas in High viscosity and dissolved gas increase the explosive potential of a magma.

What determines if a volcano will explode?

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.

Why does water make volcanoes more explosive?

Water migrates upwards and causes the top of the subducted oceanic crust to melt producing magma beneath the Cascade volcanoes. The key part of the study Wallace said involved hydrogen isotopes. “Most of the hydrogen in water contains a single proton ” he said.

What is one factor that determines how explosive a volcanic eruption quizlet?

A magma with high silica (>60%) will be quite viscous and so the eruption will be violent. One other factor is the amount of dissolved volatiles in the magma (chlorine gas water and other gases). A magma with a lot of dissolved gases will form a lot of large bubbles.

What are three factors that determine how violent a volcanic eruption will be?

There are three main factors that influence the violence of a volcanic eruption: 1. magma viscosity 2. magma temperature and 3. amount of dissolved gases.

What will most likely occur before a volcanic eruption?

Which will most likely occur before a volcanic eruption? Increase in earthquake activity. A rural forested area receives a lot of rain in a short amount of time. What would most likely cause potential flooding in the area?

What is the effect to volcanic eruption in water content?

Turbidity affects water quality and water treatment.

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Volcanic ashfalls can increase water turbidity if the finer particles remain suspended in the water. In general the major water quality affect of ashfall on raw water sources is increased turbidity rather than changes in chemical composition.

What is excessively explosive type of eruption of gas and pyroclastic?

A Pelean eruption is associated with explosive outbursts that generate pyroclastic flows dense mixtures of hot volcanic fragments and gas described in the section Lava gas and other hazards.

Which characteristic of magma mainly determines its explosiveness?

Viscosity together with the amount of gas dissolved in magma can determine the explosivity of the eruption. More viscous magma with volatiles is more explosive than less viscous magma where gases can bubble out relatively easily.

What four factors determine a volcanic eruption?

The type of volcanic eruption is determined by the magma composition magma temperature and amount of dissolved gases. List the materials ejected from volcanoes. The materials ejected from volcanoes include lava gases and pyroclastic materials such as ash dust cinders volcanic blocks and volcanic bombs.

What are two main factors that determine the violence of an eruption?

The two main factors that influence how a volcano will erupt are viscosity and gas content. Both are related to the composition of the magma.

What two factors determine whether an eruption will be explosive or quiet?

Question Answer
These two factors control whether an eruption will be explosive or quiet? Water vapor and silica
Magma that is low in silica and produces nonexplosive eruptions is called? basaltic
Magma that is high in silica and produces explosive eruptions is called? granitic

What factors influence the violence or style of an eruption quizlet?

The violence of an eruption is related to how easily gases escapes from the magma. – Gas cannot escape easily from a viscous magma allowing it to collect. Is silica poor low gas content high melting temperature compared to rhyolitic to andesitic magma.

What is the cause and effect of volcanic eruption?

Effects of volcanic eruptions
Positive Negative
The high level of heat and activity inside the Earth close to a volcano can provide opportunities for generating geothermal energy. Lava flows and lahars can destroy settlements and clear areas of woodland or agriculture.

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What are the causes of volcanic eruption Wikipedia?

Volcanic eruptions arise through three main mechanisms:
  • Gas release under decompression causing magmatic eruptions.
  • Thermal contraction from chilling on contact with water causing phreatomagmatic eruptions.
  • Ejection of entrained particles during steam eruptions causing phreatic eruptions.

What happens before volcanic eruption?

Notable precursors to an eruption might include:

An increase in the frequency and intensity of felt earthquakes. Noticeable steaming or fumarolic activity and new or enlarged areas of hot ground. Subtle swelling of the ground surface. Small changes in heat flow.

What type of volcanic eruption is the most explosive?

Plinian eruptions

Pelean and Plinian eruptions are the most dangerous and explosive of the eruption types. Pelean eruptions are named for the catastophic eruption on the island of Martinique in the Carribean Sea in 1902. The eruption and the pyroclastic flow that followed killed 29 000 people almost instantly.

What will you do before the volcanic eruption?

  1. Listen for emergency information and alerts.
  2. Follow evacuation or shelter orders. …
  3. Avoid areas downstream of the eruption.
  4. Protect yourself from falling ash.
  5. Do not drive in heavy ash fall.

How do volcanoes cause flooding?

Mudflows and flash floods.

Hot ash or lava from a volcanic eruption can rapidly melt snow and ice at the summit of a volcano. … Intense rainfall can erode fresh volcanic deposits to form large mudflows.

How does volcanic eruption affect producers?

Plants are destroyed over a wide area during an eruption. The good thing is that volcanic soil is very rich so once everything cools off plants can make a big comeback! Livestock and other mammals have been killed by lava flows pyroclastic flows tephra falls atmospheric effects gases and tsunami.

How magma composition affects the eruption of a volcano?

Magmas differ in composition which affects viscosity. Magma composition has a large effect on how a volcano erupts. Felsic lavas are more viscous and erupt explosively or do not erupt. Mafic lavas are less viscous and erupt effusively.

How can volcano become a source of electricity?

Geothermal energy uses the heat trapped beneath the Earth’s surface to generate electricity. Conventional geothermal energy utilizes steam from natural sources such as geysers or by drawing water from the hot high-pressue depths of the Earth. The hot vapors are then used to drive electric turbines.

Why do volcanic eruptions vary in their magnitude?

The amount of dissolved gas is the biggest factor affecting magnitude as low-viscosity magma allows escaping gases to move through the magma and escape to the surface. Viscous magma traps gas bubbles which cannot escape.

Which characteristics of magma does not determine its explosiveness?

Non explosive eruptions are favored by low gas content and low viscosity magmas (basaltic to andesitic magmas). If the viscosity is low non-explosive eruptions usually begin with fire fountains due to release of dissolved gases. When magma reaches the surface of the earth it is called lava.

Where does magma collect in a volcano?

magma chamber

Magma is hot melted rock found inside the Earth . It collects deep under a volcano in an area called a magma chamber. Over time magma and gases like water vapor and carbon dioxide build up in the magma chamber. When the pressure becomes too great a volcano will erupt.

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What is the shape of the volcanic cone formed from the following types of volcanic emission?

A volcanic cone is a triangle-shaped hill formed as material from volcanic eruptions piles up around the volcanic vent or opening in Earth’s crust. Most volcanic cones have one volcanic crater or central depression at the top. They are probably the most familiar type of volcanic mountain.

What are the factors that control whether an eruption is explosive or nonexplosive explain your answer?

The amount of dissolved gas in the magma provides the driving force for explosive eruptions. The viscosity of the magma however is also an important factor in determining whether an eruption will be explosive or nonexplosive.

Would it be more likely for a major explosive eruption to occur at an Ocean Ridge or at a convergent oceanic continental boundary?

An explosive eruption would be more likely at a convergent ocean-continental boundary because the magma produced is more silica rich more viscous and contains more water.

What causes volcano?

On land volcanoes form when one tectonic plate moves under another. Usually a thin heavy oceanic plate subducts or moves under a thicker continental plate. … When enough magma builds up in the magma chamber it forces its way up to the surface and erupts often causing volcanic eruptions.

What factors affect the nature of volcanic eruptions?

The style of eruption depends on a number of factors including the magma chemistry and content temperature viscosity (how runny the magma is) volume and how much water and gas is in it the presence of groundwater and the plumbing of the volcano.

Which of the following factors help determines whether a volcanic eruption will be violent or relatively quiet?

The amount of water vapor and other gases present is one factor that determines whether a volcanic eruption will be quiet or explosive.

What increases the explosive potential of a magma body beneath a volcano?

The viscosities of magmas increase with increasing percentages of silica. The eruptions of the Hawaiian volcanoes may be described as explosive in comparison to the 1980 Mount St.

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