Generally speaking, it is the initial stage of magma formation and ascent, the stage of magma sac and the stage of leaving the magma sac to the surface. These three stages are all ready to form the final gorgeous explosion.
1, magma formation and initial rising stage: In fact, magma is not achieved overnight, and it needs a formation process: partial melting, and the molten body is separated from the parent rock.
2. Magma capsule stage: Magma capsule belongs to an important action area for storing magma, and it is also an area where magma is concentrated in the rock medium of crust or upper mantle.
3. From the magma sac to the surface stage: the ascent of magma passage from the magma source to the near surface is related to the overpressure of magma sac, the formation and penetration of the passage, and the crystallization in the ascending magma, which is actually related to the degassing process.