noun
magma reservoir; magma chamber
Geological term for an underground accumulation of molten rock. Used in volcanology and earth science.
火山の地下には巨大なマグマ溜りがある。
There is a huge magma reservoir beneath the volcano.
マグマ溜りの圧力が高まると噴火
When the pressure in the magma chamber rises, the risk of eruption increases.