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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

From: Temporal variation in source location of continuous tremors before ash–gas emissions in January 2014 at Aso volcano, Japan

Fig. 6

Observed root-mean-squared amplitude and amplitude ratio. a Time evolution of root-mean-squared amplitude recorded at all stations (frequency: 5–10 Hz; window length: 30 min with a sliding length of 15 min). The yellow triangle represents the reported eruption (Japan Meteorological Agency 2014). The boundaries of the five stages defined in the present study are shown as vertical lines. b Examples of amplitude ratios at each station (in this case, referenced to SUN)

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