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

Fig. 4

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. 4

a, b TR1 and TR2 waveforms recorded at IOCD. The black shows the vertical component of the seismometer, and the magenta shows the microphone record. The data were filtered within the frequency band of 1–10 Hz. 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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