Peak Ground Acceleration of Tohoku Earthquake? 

The Wikipedia article titled "2011 Tōhoku earthquake and tsunami" shows the peak ground acceleration of the March 11 quake at 2.99 g on the right sidebar and has the statement "Japan's National Research Institute for Earth Science and Disaster Prevention (NIED) calculated a peak ground acceleration of 2.99 g (29.33 m/s²)." under the heading "Energy".  The Wikipedia article titled "Fukushima I nuclear accidents" has the statement "The 9.0 MW Tōhoku earthquake at 14:46 JST on Friday, 11 March 2011 resulted in maximum ground accelerations of 0.56, 0.52, 0.56 g (5.50, 5.07 and 5.48 m/s2) at units 2, 3 and 5 respectively," under the heading "Direct effect of the earthquake and tsunami".  Is this because the ground acceleration at units 2, 3, and 5 is a local ground accelration at the reactors while the 2.99 g mentioned in the Tohoku Eartqauke article was measured at the epicenter?  The information indicated for peak ground acceleration between the two articles is somewhat confusing.