Erratum to: Earth Planets Space (2015) 67:111 DOI 10.1186/s40623-015-0288-x

Unfortunately, the original version of this article (Kato et al. 2015) contained a mistake. An incorrect scale bar in Fig. 7d was included. The scale bar in Fig. 7d should be as in the corrected version below.

Fig. 7
figure 7

Precursors of the 2014 phreatic eruption. a Horizontal distance of detected VT earthquakes from 11:30 to 12:00 JST on 27 September 2014, projected onto the strike of the hypocenter alignments (N15W-S15E). Circles are scaled to magnitude and color-coded to depth. Black dashed lines approximate the locations of the fronts of earthquake migrations. b Depth variations in VT earthquakes, colored to depth. Circles are scaled to magnitude. Black dashed lines approximate the locations of the fronts of earthquake migrations. c Bandpass-filtered waveform between 4 and 12 Hz (black curve) and envelope between 1 and 4 Hz (red curve) recorded at the V.ONTN station. d Time series of tiltmeter records observed at the V.ONTN station. NS and EW components denote the northward and eastward ground-up components, respectively