Seismic Intensity : Eight (VIII) - Heavily Damaging

Eight (VIII) : Damage slight in structures of good design, considerable in normal buildings with a possible partial collapse. Damage great in poorly built structures. Brick buildings easily receive moderate to extremely heavy damage. Possible fall of chimneys, factory stacks, columns, monuments, walls, etc. Heavy furniture moved.

Perceived Shaking


Potential Damage


Peak Ground Motion Acceleration

34 to 65 (%g)

Peak Ground Motion Velocity

31 to 60 (cm/sec)

Video Example

Intensity Eight (VIII)

Reference: Modified Mercalli Intensity Scale (Adapted from Sieberg's Mercalli—Cancani scale, modified and condensed)