Figure 8
Sketch of magma storage and ascent during the early stage of CV 2021 eruption (not to scale). A storage level of 25–35 km is envisaged for basanitic magmas, which could be responsible for pre-eruption seismicity. Crystal-rich tephritic magmas could instead have evolved in a shallower reservoir at 16–23 km, which became intruded (1) by the basanitic magma on early September 2021. Subsequently, a heterogeneous magma quickly ascended through the ocean crust (2) and island edifice, until major bubble nucleation at level (3) further enhanced mixing and likely influenced eruption explosivity.
