Primitive, volatile-rich magma arrival from depth into a degassed, evolved reservoir at 3km depth is investigated. The two magmatic end-member mix very efficiently on time scales of hours. The evolution is characterized by very heterogeneous pressure variations in space and time, showing oscillations lasting minutes to hours. Synthetic seismic signals display the same frequency content, which proves indicative of ongoing convection at depth. Comparison with monitoring records yields remarkable similarities.

1. magma dynamics
2. magma mixing
3. Volcano seismology