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Fig. 6 | Earth, Planets and Space

Fig. 6

From: Anatomy of phreatic eruptions

Fig. 6

Harmonic Tremor at White Island. Harmonic tremor recorded at White Island after a seismic quiescence of 20 min, and lasting for 8 h. The fundamental frequency evolves from \(\sim\) 0.8 at the onset of the tremor to \(\sim\) 1 Hz when it ends. The frequency of \(\sim\) 0.8 Hz implies a source excitation of \(\sim\) 1.3 s. We used a window of 512 samples with a 25-sample overlap to create the spectrogram

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