peak ground acceleration of tohoku earthquake the wikipedia article titled t hoku earthquake and tsunami shows the peak ground acceleration of the march quake at 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 g m s under the heading energy the wikipedia article titled fukushima i nuclear accidents has the statement the mw t hoku earthquake at jst on friday march resulted in maximum ground accelerations of g and m s at units and respectively under the heading direct effect of the earthquake and tsunami is this because the ground acceleration at units and is a local ground accelration at the reactors while the 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