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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Harmonic tremor from the deep part of Hakone volcano

Fig. 3

Vertical velocity waveforms and their running spectrograms at a N.ASGH, b OMZ, c TNM, and d SSN stations during the main volcanic tremor (03:25–03:45). The red line shows the temporal change of RMS amplitude. e, f show the spectrograms during the onset of the tremor (210–270 s) and the harmonic tremor (720–780 s), respectively

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