GeoNet

MM4

New Zealand Modified Mercalli Intensity Scale

People

Generally noticed indoors but not outside. Light sleepers may be awakened. Vibration may be likened to the passing of heavy traffic, or to the jolt of a heavy object falling or striking the building.

Fittings

Doors and windows rattle. Glassware and crockery rattle. Liquids in open vessels may be slightly disturbed. Standing motorcars may rock.

Structures

Walls and frames of buildings, and partitions and suspended ceilings in commercial buildings, may be heard to creak.

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