Fig. 4

a Acoustic eruption pulse signals filtered between 0.5 and 10 Hz with corresponding spectrograms for WIZ, b acoustic eruption pulse signals filtered between 0.5 and 10 Hz with corresponding spectrograms for WSRZ
a Acoustic eruption pulse signals filtered between 0.5 and 10 Hz with corresponding spectrograms for WIZ, b acoustic eruption pulse signals filtered between 0.5 and 10 Hz with corresponding spectrograms for WSRZ