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

Fig. 6

From: Vault-housed extensometers recorded a rapid initial pulse before precursory magma reservoir inflation related to the 2011 eruption of Shinmoe-dake, Japan

Fig. 6

Strain change rate on component E1 at station ISA, 2004–2017. The strain change rate is defined as the time derivative of the 24-h moving average of the original time series. Gray shadows correspond to time periods in which significant precipitation (> 40 mm/h) was observed in the previous week, which likely affects strain data. Open (positive) and solid (negative) inverted triangles indicate strain rates that exceed the threshold levels of \(1.5 \times 10^{ - 9} {\text{day}}^{ - 1}\) (dotted lines). The threshold value is half the strain rate at the beginning of the edifice inflation that led to the major eruption in 2011

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