Volcano Live
volcanolive.com
Types of Volcanic Eruptions - John Seach
Volcanoes erupt in a variety of ways. Eruptions may be gentle such as degassing or catastrophic in a plinian eruption.
Explosive eruptions are fed by shallow magma chambers, and are mainly characterized by a water-saturated magma, a temporal-increasing eruption-rate and deep seismicity following the later stages of eruption. The eruption ends when sufficient decompression is attained to cause magma chamber collapse and restoration of the initial pressure conditions.