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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Temporal changes in the distinct scattered wave packets associated with earthquake swarm activity beneath the Moriyoshi-zan volcano, northeastern Japan

Fig. 4

N–S component band-pass filtered (8–24 Hz) envelopes for events with similar waveform of direct waves at hypocenter grid numbers of a 122, b 125, c 132, d 159, e 164, and f 167. Gray lines on the top in each panel show the overwriting of envelopes. Colored envelopes were modified by applying auto gain control to improve the visibility of the DSW. Color of circles on the left-hand side of envelopes shows the year of event occurrence. Color of circles and squares on the right-hand side of envelopes represents the cross-correlation for direct wave and DSW to the reference event marked by a star. Green lines on the time axis indicate the time window of CC calculations. All traces are aligned with P-wave onset

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