The five main types of volcanic eruptions and their characteristics, depending on the composition and viscosity of the magma ...

The type of lava erupted by Nyiragongo and many volcanoes in the East Rift zone of Africa, called alkaline lava, has an extremely low viscosity, making it almost as fluid as water. Alkaline lava ...

A volcano near Anchorage, Alaska, called Mount Spurr, has been rumbling. As a result, the U.S. Geological Survey and Alaska Volcano Observatory issued an alert. This indicates that the volcano, which ...

The two types of volcano form in different places and have ... A lava tube may also form, beneath the surface of the ground, when low viscosity lava develops a hard crust through which lava ...

For example, Crater Lake volcano, inactive for millennia, still retains a vast magma reservoir beneath its surface. Finally, magma viscosity also influences this dormancy. Silica-rich magma is more ...

However, current viscosity measurements of high temperature materials are ... rheometer capable of measuring magmas over the range of conditions experienced during volcanic eruptions. Our new ...