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Fig. 7 | Progress in Earth and Planetary Science

Fig. 7

From: Determination of temporal changes in seismic velocity caused by volcanic activity in and around Hakone volcano, central Japan, using ambient seismic noise records

Fig. 7

Dependence of the time shift dt on the lag time t in ACFs. a, b Lag time and time dependence of the relative ACF phase delay at the KOM and OWD stations. Time shifts dt were measured by the cross-correlation of the reference ACF and each ACF with a time window of 1.5 s. If the maximum correlation coefficient was less than 0.6, the time shift value was excluded; these values are shaded gray. Time shift as a function of lag time t c at the KOM station on 26 March 2011 (immediately after the 2011 Tohoku-oki earthquake), d at the KOM station on 20 May 2013, and e at the OWD station on 20 February 2013 (during the 2013 swarm activity). Only dt values with cross-correlation coefficients of 0.6 or greater and standard deviations dt of less than 0.05 s are plotted

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