Abstract
The propagation of the current densities such as pyroclastic flows, rockfalls, and lahars generates the seismic signals. In this chapter, the waveforms and the corresponding Fourier spectra of these signals are analyzed. It is shown the difference in the waveforms of pyroclastic flows generated during the partial lava dome collapse and the collapse of pyroclastic material from the eruption column produced by volcanic explosion. The difference in the durations and spectral content of the seismic signals, produced by pyroclastic flows and lahars, allows discriminating them during real-time monitoring. The methodology of quantification of the volume of pyroclastic deposits from the seismic records is proposed.
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