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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Classification of long-term very long period (VLP) volcanic earthquakes at Whakaari/White Island volcano, New Zealand

Fig. 2

Triggered VLP signals based on two-station waveform semblance. a Peak-to-peak (P2P) amplitude (μm/s) of VLP families (F1 and F2) and unrelated events (U; gray) determined by b a cluster tree. The amplitude is computed using the vertical component of WIZ station. This dendrogram is created based on the correlation distance in all pairs of 92 VLP events and its x axis is event index regardless of a time order (can check VLP triggered time and index information in Additional file 1). c Stacked waveforms (thick coloured lines) of individual events (thin gray lines) for the two identified families recorded at WIZ and WSRZ stations. Frequency spectra are computed using each unfiltered example waveform recorded at WIZ (black) and WSRZ (green). All amplitudes are normalized. The stacking procedure is based on actual amplitude, and the stacked events are used as templates (see in “Template-matched VLPs” section)

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