Magma Chamber - John Seach


(Magma reservoir or volcanic chamber)

A magma chamber is shallow storage chamber for molten rock 1 to 10 km underground. The magma chamber is the immediate origin of material ejected in volcanic eruptions.
Magma enters the chamber from an unknown location at depth.

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.

It is found that for a given magma volatile content and conduit geometry, variations in the chamber volume, depth and aspect ratio have a significant impact on the mass erupted and the eruption duration.