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Fig. 2 | Earth, Planets and Space

Fig. 2

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. 2

Locations of the observation sites. Red squares (A1 and A2), absolute gravity measurement sites. The records at A1 and A2 were corrected for vertical crustal movement using GPS data at stations C1 and C2, respectively. Black squares (R1–R9), relative gravity measurement sites. Measurements were conducted on leveling markers that are attached to the foundation of GPS station equipment. T1 and T2, tidal stations. W1–W4, observation wells for monitoring groundwater levels. Solid and dashed contours, slip rates on the plate boundary for 2001–2005 and 2006–2009, respectively (cm/yr). These rates were determined with the same data that were used to calculate the slip distribution in Fig. 1.

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