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Mercalli Scale

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11 facts:

Weak. Felt Indoors by Many. Like Vibration of Truck Passing.
Not necessarily recognized as an earthquake.
Very Weak. Felt Only by a Few Indoors & at Rest
Usually only felt on upper floors of tall buildings
Not Felt at All
Except by a very few under especially favorable conditions
Light. Rattling. Like Vibration of a Train Passing
Felt indoors by many, outdoors by few during the day. At night, some awakened. Dishes, windows, doors disturbed; walls make cracking sound. Standing motor cars rocked noticeably.
Violent. Damage Considerable Even in Specially Designed Structures. Buildings Shifted off Foundations.
Well-designed frame structures thrown out of plumb. Damage great in substantial buildings, with partial collapse.Heavy damage to masonry structures and to underground pipes. Large cracks in ground
Severe. Considerable Damage in Ordinary Substantial Buildings.
Little damage in specially built structures. Damage great in poorly built structures. Fall of chimneys, factory stacks, columns, monuments, walls. Heavy furniture overturned.
Very Strong. Considerable Damage to Poorly Built Structures.
Slight to moderate damage in well built, ordinary structures. Some walls may fall. Can't stand upright. Ornamental masonry falls from buildings -- Waves in ponds and pools.
Strong. Some Heavy Furniture Moved. Difficult to Stand.
Perceptible to everyone. May cause public fright. Pictures fall off walls. Masonry cracks, plaster falls.
Moderate. Trees & Poles May Shake. Unstable Objects Overturned.
Felt by nearly everyone; many awakened. Some dishes, windows broken. Unstable objects overturned. Pendulum clocks may stop. Small objects knocked off shelves.
Extreme. Most Masonry Structures Destroyed With Foundations
Some well-built wooden structures destroyed. Water splashes over riverbanks.
Mass or Total Destruction
XI Few, if any (masonry), structures remain standing. Bridges destroyed. XII. Damage total

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USS Palladin

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