(a) Plot of δV
(Nakajima et al., 2010) versus the coda Q at 1.5 Hz frequency band and (b) that at 2.0 Hz frequency band. R shows the correlation coefficient and p denotes the p-value. (c) Plot of the depth of δV
versus the correlation coefficient. A gray scale shows the p-value. (d) Plot of the differential strain rate (Sagiya et al., 2000) versus the coda Q at the 1.5 Hz frequency band, and (e) that at the 2.0 Hz frequency band.