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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: Identification of infrasonic and seismic components of tremors in single-station records: application to the 2013 and 2018 events at Ioto Island, Japan

Fig. 5

a, b PN and EQ waveforms recorded at IOCD on September 12 and 18, 2018, respectively. The black shows the vertical component of the seismometer, and the magenta shows the microphone record. PN and EQ data are filtered within the frequency band of 10–30 Hz and 1–10 Hz, respectively. c, d The cross-correlation of the seismic and infrasonic data in a, b in a 5-s time window sliding every 1 s. The vertical axis, \(\tau\), is the time delay of the seismic to infrasonic data

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