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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Gravity changes observed between 2004 and 2009 near the Tokai slow-slip area and prospects for detecting fluid flow during future slow-slip events

Fig. 4

Time series of the observed gravity changes at the relative gravity measurement sites with corrections applied as described in the text. The red, blue, and green points denote gravity changes observed by the relative gravimeters S/N 581, 705 and 876, respectively. The errors for these data were evaluated by a statistical analysis (±16 μGal; see Section 2.3). In all panels, one division of the vertical axis corresponds to 10 μGal. The black and gray solid lines denote the observed linear trends and their prediction bands. The linear trends were estimated using the minimum L1-norm condition (see also Table 1). At R4, gravity data obtained during different observation periods demonstrate larger scatters than elsewhere. Measurement data from 2010 have been incorporated in the analysis to enhance the accuracy of trend estimation.

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