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Why some volcanic eruptions are very explosive and others are less explosive?
Wiki User
∙ 12y ago
It all depends on the consistency of the magma and the temperature of the magma. The thicker the magma is, the quieter the eruption. If the magma is thinner, the eruption will be more violent.
Wiki User
∙ 12y ago
Wiki User
∙ 7y agoThere are two factors in how explosive a volcanic eruption: the viscosity of the magma and gas content. Magma contains gasses that are dissolved under high pressure. These gasses are released when the magma is exposed to lower pressure near the surface in an effect similar to opening a can of soda that has been shaken. More gas means a more explosive eruption. More viscous magmas tend to hold more gas, and that gas is less likely to escape ahead of the magma before an eruption can begin.
Wiki User
∙ 12y agoIt is the amount of silicon in the magma of the volcano. There are three types of volcanos; Rhyolite volcanos, Andesite volcanos and basalt volcano. Andesite volcanos are most prominent at approx. 55% silicon while Basalt are approx. 50% silicon where as Rhyolite volcanos are approx. 70% silicon and have been known to cause changes in our climate from the their eruptions which can cause years of severe climate issue due to the amount of ash spread on the Earth and it's atmosphere.
Wiki User
∙ 12y agobubbles! The exlposivty of eruption is determined by the how many bubbles are present to provide nucleation points for fractionation. Bubbles are formed from volatiles, mostly water but also CO2 and other aerosols, so adding water to an eruption will make it more explosive.
Wiki User
∙ 12y agoits the lava that is in the volcano. basaltic,andesitic,and rhyolitic magma. basaltic magma contains small amounts of dissolved gases and silica. the volcanos it fuels erupt relatively quietly. andesitic magma contains about 60% silica. this high silica content results in having intermediate viscosity. thus, the volcanoes fueled by it are said to have intermediate eruptions. rhyolitic magma forms when molten material rises and mixes with the overlying silica and water-rich continental crust. its resistance to flow ,along with the large volume of gas trapped within this magma, makes he volcanoes fueled by rhyolitic magma very explosive
Wiki User
∙ 14y agoIts because of there size, like if one is big the eruption will be small and if the volcano is small it makes a big eruption.....
Brother Wease
Brother Wease
Wiki User
∙ 11y agothe volcanoes that erupt more often are the ones that are more active than the others which dont erupt as often as the others do
Anonymous
some volcanic eruptions are more dangerous than other's
Anonymous
abhi bataya tou apko
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What are less well known dangers of volcanic eruptions?
The fumes and chemicals that come out can kill u and/or kill you.
What kind of magmas produce violent volcanic eruptions?
Those that are rich in iron and magnesium.
Why are eruptions deep in the ocean calmer than eruptions on land?
Eruptions in the deep ocean differ from eruptions on land for several reasons. The deep ocean eruptions are often tmes and depending on cause as well as location from basaltic magma. This type of magma is not known for its explosivity. The magma is the type that build the hawaiian volcanoes and more or less when erupting flows (Although it is capable of explosive eruptions). The other major factor is for an explosive eruption to be generated the magma must be very viscous to allow the build up of gas bubbles. The second half and what actually causes the explosive eruption is the explosive release of this gas. When an eruption occurs in the deep ocean it is not explosive due to the fact that the gas cannot decompress from the magma explosively due to the extreme pressures exerted by the water at such depth. Even if it were the right type of volcano that could generate explosive eruptions with the pressure it would be unable to do such a thing.
What type of eruptions do mafic magmas cause?
Basaltic magmas are associated with fissure eruptions creating lava flows spilling out from cracks in the crust. This is because basaltic magmas are more viscous and contain a lower concentration of gases than rhyolitic magma and therefore are unable to build up sufficient pressure to produce explosive eruptions.
Why are eruptions of stratovolcanoes usually more destructive than the eruptions of cinder cone volcanoes?
Eruptions of stratovolcanoes are typically more destructive than cinder cone volcanoes because stratovolcanoes have more explosive eruptions. This is because stratovolcanoes are built up over time by layers of viscous lava and pyroclastic materials, which can trap gas pockets. When the pressure builds up, it can lead to explosive eruptions that release a vast amount of ash, gas, and pyroclastic flows, causing widespread destruction and hazards. In contrast, cinder cone volcanoes typically have more effusive eruptions with less explosive activity.
Why do volcanic eruptions differ?
The main cause of differences in volcanic eruption characteristics is due to the viscosity of the magma. High viscosity magmas are high in sticky silica which traps gas and produces explosive eruptions. Low viscosity magmas are low in silica and produce eruptions with far less energetic characteristics.
What are less well known dangers of volcanic eruptions?
The fumes and chemicals that come out can kill u and/or kill you.
What kind of magmas produce violent volcanic eruptions?
Those that are rich in iron and magnesium.
Why are eruptions deep in the ocean calmer than eruptions on land?
Eruptions in the deep ocean differ from eruptions on land for several reasons. The deep ocean eruptions are often tmes and depending on cause as well as location from basaltic magma. This type of magma is not known for its explosivity. The magma is the type that build the hawaiian volcanoes and more or less when erupting flows (Although it is capable of explosive eruptions). The other major factor is for an explosive eruption to be generated the magma must be very viscous to allow the build up of gas bubbles. The second half and what actually causes the explosive eruption is the explosive release of this gas. When an eruption occurs in the deep ocean it is not explosive due to the fact that the gas cannot decompress from the magma explosively due to the extreme pressures exerted by the water at such depth. Even if it were the right type of volcano that could generate explosive eruptions with the pressure it would be unable to do such a thing.
Does gas in lava makes it more or less explosive?
The expansion of gases in lava caused by decreasing pressure as it rises to the surface can make for very explosive eruptions, such as the last eruption of Mt. St. Helens.
What model helps scientists explain earthquakes and volcanic eruptions?
Using a model is less hazardous than studying the volcano close up.
What type of eruptions do mafic magmas cause?
Basaltic magmas are associated with fissure eruptions creating lava flows spilling out from cracks in the crust. This is because basaltic magmas are more viscous and contain a lower concentration of gases than rhyolitic magma and therefore are unable to build up sufficient pressure to produce explosive eruptions.
Why are eruptions of stratovolcanoes usually more destructive than the eruptions of cinder cone volcanoes?
Eruptions of stratovolcanoes are typically more destructive than cinder cone volcanoes because stratovolcanoes have more explosive eruptions. This is because stratovolcanoes are built up over time by layers of viscous lava and pyroclastic materials, which can trap gas pockets. When the pressure builds up, it can lead to explosive eruptions that release a vast amount of ash, gas, and pyroclastic flows, causing widespread destruction and hazards. In contrast, cinder cone volcanoes typically have more effusive eruptions with less explosive activity.
How could collision between two seafloor plates produce volcanic activity?
The more dense plate could move under the less dense plate producing magma which can lead to volcanic eruptions
Does Hawaii experience effusive or explosive eruptions?
Occasionally, yes. Most of Kilauea's eruptions are effusive, however.
What is a good effect of volcanic eruptions?
less chance of it errupting again any time soon also refirtilises the eart / soil makes more land
Why are Hawaiians volcanic eruptions less violent?
Compared with some other volcanoes around the world, the Hawaiian volcanoes are fed by low-viscosity magma with a low gas content. The explosive power of a volcanic eruption is driven by gas trapped in the magma, and magma that is more viscous allows more pressure to build up. The magma in the Hawaiian volcanoes flows out fairly readily.
