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Fig. 2 | Earth, Planets and Space

Fig. 2

From: Infrasonic wave accompanying a crack opening during the 2015 Hakone eruption

Fig. 2

Results of the cross-correlation method. a RMS amplitude over 1 min for the microphone (red line) and the vertical ground velocity (black line) at the OWD station during the period from 07:00 to 11:00 June 29, 2015 and b a temporal sequence of the microphone–seismometer correlation function of the band-passed seismic and infrasonic signals. c RMS amplitude during the period from 02:30 to 06:30 on July 01 and d a temporal sequence of the cross-correlation function. e Temporal sequence of the correlation coefficient between the reference and the microphone–seismometer correlation functions during the period from May 21, 2015, to September 30, 2016, and f its magnified plot during the eruption

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