Seismic Intensity : One (I) - Not Felt

One (I) : Generally not felt by people unless in favorable conditions.

Under certain conditions, at and outside the boundary of the area in which a great shock is felt:

Perceived Shaking

Not Felt

Potential Damage


Peak Ground Motion Acceleration

Less than 0.17 (%g)

Peak Ground Motion Velocity

Less than 0.1 (cm/sec)

Video Example

Intensity One (I)

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