The above-titled article presented response-time histories and spectra for the minimum acceleration amplitude of a full sine pulse that is needed to overturn a rigid, rectangular, free-standing block. The construction of the overturning spectra is achieved with the analytical solution of the linearized equations of motion of a rocking block which is pieced together at the instant when the rotation reverses and at the instant when the block enters the free-vibration regime.

While some segments of the methodology presented are correct the article contains several logical, algebraic, and typographical errors which are reflected in nearly every result presented. This discussion...

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