As an experimental model of a volcanic eruption, the Electro-Magnetic HST method was used, the scheme of which includes optically transparent cuvettes with a metal bottom, a layer of distilled water and a battery of high-voltage capacitors. Under the bottom there is a “charge” in the form of a flat spiral, onto which, when closed by a high-voltage pulse of a break in the circuit, a battery of capacitors is discharged, forming a shock wave and a quasi-empty rupture, the growth of which is accompanied by a continuous decrease in pressure. The experiments recorded a detailed process of focusing a quasi-empty cavity with a smooth increase in pressure both inside it and in the shell bubbles, and the rapid transition of the latter into a dust cloud. The formation of SW ends in the form of a clear annular boundary on the surface of the cuvette bottom. The formation of toroidal bubble clusters, their separation from the bottom of the layer and a breakthrough into free space.
V.K. Kedrinskiy (Wed,) studied this question.