Fig. 3From: Waveform inversion of the ultra-long-period seismic event associated with ground tilt motion during an eruption of Mount Kusatsu–Shirane, Japan, on January 23, 2018Recorded waveforms. a Velocity waveforms recorded by broadband seismometers and b tilt waveforms recorded by tiltmeters around the eruption onset time. The red line shows the eruption onset time (10:02:09 Japan Standard Time (JST)) at Mount Motoshirane. The gray band represents the time window used in this study (09:58:20–10:10:00 JST)Back to article page