Propriété

NomModified Mercalli
CodeMM
SymboleMM
TypeEarthquake Intensity (Risque)
Type de donnéesTabulaire
Options
NoCodeNomDescription
1.IInstrumental

Not felt by many people unless in favorable conditions.

2.IIWeak

Felt only by a few people at best, especially on the upper floors of buildings. Delicately suspended objects may swing.

3.IIISlight

Felt quite noticeably by people indoors, especially on the upper floors of buildings. Many do not recognize it as an earthquake. Standing motor cars may rock slightly. Vibration similar to the passing of a truck. Duration estimated.

4.IVModerate

Felt indoors by many people, outdoors by few people during the day. At night, some awakened. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing motor cars rock noticeably. Dishes and windows rattle alarmingly.

5.VRather Strong

Felt outside by most, may not be felt by some outside in non-favorable conditions. Dishes and windows may break and large bells will ring. Vibrations like large train passing close to house.

6.VIStrong

Felt by all; many frightened and run outdoors, walk unsteadily. Windows, dishes, glassware broken; books fall off shelves; some heavy furniture moved or overturned; a few instances of fallen plaster. Damage slight.

7.VIIVery Strong

Difficult to stand; furniture broken; damage negligible in building of good design and construction; slight to moderate in well-built ordinary structures; considerable damage in poorly built or badly designed structures; some chimneys broken. Noticed by people driving motor cars.

8.VIIIDestructive

Damage slight in specially designed structures; considerable in ordinary substantial buildings with partial collapse. Damage great in poorly built structures. Fall of chimneys, factory stacks, columns, monuments, walls. Heavy furniture moved.

9.IXViolent

General panic; damage considerable in specially designed structures, well designed frame structures thrown out of plumb. Damage great in substantial buildings, with partial collapse. Buildings shifted off foundations.

10.XIntense

Some well built wooden structures destroyed; most masonry and frame structures destroyed with foundation. Rails bent.

11.XIExtreme

Few, if any masonry structures remain standing. Bridges destroyed. Rails bent greatly.

12.XIICataclysmic

Total destruction - Everything is destroyed. Lines of sight and level distorted. Objects thrown into the air. The ground moves in waves or ripples. Large amounts of rock move position. Landscape altered, or leveled by several meters. In some cases, even the routes of rivers are changed.

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Créé: Système

Estimateurs de propriété

NoNomValeurConditions de validité
1.Modified Mercalli intensity from instrumental intensityƒ(MMI)----

Évaluation des risques

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Installations industrielles

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