Based on of experimental data obtained during almost 30 years period at the Kamchatka volcanic eruptions, acoustic signals in the range of 1,0-10 Hz are considered, generated immediately during the magma disebaige onto the surface due to its degassing. It is shown that the acoustic signals from this range generated by volcanic eruptions are weak shock airwaves in the nearby zone. They can be divided based on their of its impulse form and statistical parameters in to 6 types associated with different unsteady processes conditioned by magma degassing. The crater dimensions control the characteristic time of pulse of surplus pressure of volcanic shock airwaves. Acoustic signals contain information about eruption dynamics and crater geometry modifications, on the examples of terminal and lateral eruptions of the Kluchevskoi volcano in May-June, 1983. The author made estimations of explosive gas amount for three strombolian type eruptions, using acoustic signals parameters. Basis for a scientific direction – volcanic acoustics – is established.
The book is of special interest for specialists in volcanology, atmosphere acoustics and explosions.
P. 89. Tables 14. Figures 39. Bibliography 79