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Earth, Planets and Space
Fig. 5. | Earth, Planets and Space

Fig. 5.

From: Gravity variation around Shinmoe-dake volcano from February 2011 through March 2012—Results of continuous absolute gravity observation and repeated hybrid gravity measurements

Fig. 5.

Gravity disturbance arising from precipitation. (a) Absolute gravity minus a nominal value of 979,222,030 μgal at the Kirisima Volcano Observatory (KVO in Fig. 1). The symbols × and • stand for gravity before and after correcting for the precipitation effect given by Eq. (10), respectively. (b) Cumulative precipitation between February 2011 and March 2012. Impulsive rainfall events are observed in mid-August (A) and in late September (B), causing systematic disturbance to the gravity data (A′ and B′ in the upper panel). The horizontal arrows in the upper panel indicate that the relaxation time after impulsive rainfall is of order 30 days.

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