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Earth, Planets and Space
Fig. 9 | Earth, Planets and Space

Fig. 9

From: Gravity changes associated with variations in local land-water distributions: Observations and hydrological modeling at Isawa Fan, northern Japan

Fig. 9

Gravity change due to soil moisture distribution and instrumental drift from 2009 to 2010, considering building effects. (a) Top and middle lines are gravity changes due to soil moisture inside and outside the observation building ( and ), respectively. Lower thick and gray lines are total gravity change due to soil moisture with and without the building effect, (Eq. (28)) and gw(t) (Eq. (17)), respectively. Gray bar is observed daily precipitation, R(t), at Mizusawa. (b) Thin, gray and solid lines are estimated drift component, gd(t), observed gravity, gobs(t), and estimated total gravity, gcal(t), during 2 years from 2009 to 2010. On the right, values for Ads and , RMS and CC. (c) Gray and solid lines are observed gravity, gobs(t), and estimated total gravity, gcal(t) during 50 days from 26 April to 15 June, 2010 (dashed square in Fig. 9(c)). Gray bar is observed hourly precipitation, R(t), at Mizusawa. On the right, values for , RMS and CC.

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