PGA is equal to the amplitude of the largest absolute acceleration recorded on an accelerogram at a site during a particular earthquake.
2.
By applying the transformation above from the stationary to the rotating frame three times, the absolute acceleration of the particle can be written as:
3.
Neither Einstein nor Langevin considered such results to be problematic : Einstein only called it " peculiar " while Langevin presented it as a consequence of absolute acceleration.
4.
Where is the vector sum of the physical forces applied to the particle and is the absolute acceleration ( that is, acceleration in an inertial frame ) of the particle, given by:
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