viscosity of magma
build up of gases
we
Silica(te) rich magma is usually an explosive eruption. The explosiveness of an eruption depends on - a) Gases trapped within the magma at eruption b) The Silica content c) The fragility of the crater walls and/or the volcanic plug.
The explosiveness of an eruption is primarily controlled by the viscosity of the magma and the amount of gas trapped in it. Low viscosity magma with high gas content tends to lead to more explosive eruptions, while high viscosity magma with lower gas content leads to less explosive eruptions.
The two principal factors that can determine the nature or explosiveness of a volcanic eruption is Temperature and Composition in terms of its water content, mineralogy and volatility.
The weight of the volcano.
The more gases, water vapor and silica there is in magma the bigger the explosiveness of a volcanic eruption.
we
The high the silica content, the explosive and the eruption.
Pressure and magma
Silica(te) rich magma is usually an explosive eruption. The explosiveness of an eruption depends on - a) Gases trapped within the magma at eruption b) The Silica content c) The fragility of the crater walls and/or the volcanic plug.
The explosiveness of an eruption is primarily controlled by the viscosity of the magma and the amount of gas trapped in it. Low viscosity magma with high gas content tends to lead to more explosive eruptions, while high viscosity magma with lower gas content leads to less explosive eruptions.
The two principal factors that can determine the nature or explosiveness of a volcanic eruption is Temperature and Composition in terms of its water content, mineralogy and volatility.
The weight of the volcano.
less gas dissolved in the ejected material therefore less ash ad explosiveness in the eruption. There still is an outpouring of matter though in the form of lava with less dissolved gas.
Silicon
The eruption in Montserrat in 1995 was a catastrophic event but it did not have a specific Richter scale measurement because the scale is typically used to measure earthquakes, not volcanic eruptions. Instead, volcanic eruptions are typically measured using the Volcanic Explosivity Index (VEI) which gives a sense of the eruption's intensity and explosiveness.
The loudness of a volcano eruption is typically measured using a seismometer to record the seismic waves generated by the eruption. A volcanic explosivity index (VEI) is also often used to quantify the explosiveness of an eruption based on factors such as eruption column height and volume of material ejected. Additionally, infrasound sensors can be used to detect low-frequency sound waves produced by the eruption.