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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

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

Fig. 3

Seismicity and amplitude variation of volcanic tremors. a, b Daily numbers of LP and VLP events at Aso volcano for a three-month observation period reported by Japan Meteorological Agency (2014). c Change in the root-mean-squared amplitude of the seismic record at SUN (black dots) and \(\hbox {SO}_2\) discharge rate measured by Japan Meteorological Agency (2014) (red circles). The yellow triangles at the top of the diagram represent reported eruptions. Four vertical gray lines that run through (a–c) indicate the times of the graphs shown in Fig. 4. Blue horizontal arrows indicate the time span of our analysis

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