Fig. 2: Relative velocity variations from AC.
From: Hidden pressurized fluids prior to the 2014 phreatic eruption at Mt Ontake
Temporal evolution of relative seismic velocity at station ONTA using different frequency bands (1.0–2.0, 0.5–1.0, and 0.1–1.0 Hz). The vertical red line indicates the 27 September 2014 eruption. Errors are shown as shaded values around each curve and are estimated following Lecocq et al.28. A velocity anomaly is observed from June to October 2014 in the 1–2 Hz frequency band.
