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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Postseismic gravity changes after the 2011 Tohoku earthquake observed by superconducting gravimeters at Mizusawa, Japan

Fig. 2

a Residual gravity data after tidal analysis for the two SGs (SG007 and SG016) at Mizusawa. The vertical cyan line in October 2017 indicates the time when the gravimeters were replaced. The offset value in October 2017 is arbitrary. b Difference between the nominal gravity values from the SGs and the absolute gravity values from absolute gravimeters (black cross). Fitting a straight line to these data gives the rate of instrumental drift of the SGs. The data before and after the replacement were processed independently. c Residual gravity after correcting the instrumental drift of the SGs. A constant value of 980,146,200 µGal has been subtracted. e Detailed view of the data before and after the replacement of the SGs. d Water level changes observed at ground water observation well Wn

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