| Instrumental | I | 2 | 1.0 - 3.0 | Microearthquakes, usually not felt - detected by instruments |
| Feeble | II | 2 | 3.9 | Often felt, especially on upper floors - detected by instruments |
| Slight | III | 3 | 4.0 | Felt noticeably indoors, vibration like passing vehicles, cars may rock |
| Moderate | IV | | 4.9 | Felt indoors by many, felt outdoors by few. Dishes and doors disturbed, like a heavy truck nearby, walls-cracking sound |
| Rather Strong | V | 4 | 5.0 | Felt by most people, slight damage. Some dishes and windows broken, some cracked plaster, trees disturbed |
| Strong | VI | 5 | 5.9 | Felt by all, many frightened and run outdoors. Damage minor to moderate |
| Very Strong | VII | 5 - 6 | 6.0 | Everyone runs outdoors. Much damage to poor designed buildings, some chimneys broken, noticed by people driving cars |
| Destructive | VIII | 6 | 6.9 | Everyone
runs outdoors. Damage moderate to major. Minor damage to well
designed structures, major damage in poor designed structures.
Chimneys, columns and walls falls. Heavy furniture turned. Well
water changes, sand and mud ejected |
| Ruinous | IX | 7 | 7.0 | Can cause serious damage over larger areas. Major damage in all structures, ground cracked, pipes broken, shift foundation |
| Disastrous | X | 7 - 8 | | Major
damage, most masonry and frame structures destroyed. Ground badly
cracked, landslides, water sloshed over river banks, rails bent |
| Very Disastrous | XI | 8 | | Almost all masonry structures destroyed, bridges fall, big fissures in ground, land slumps, rails bent greatly |
| Catastrophic | XII | >8 | | Devastating
in areas several thousand miles across. Total destruction, Ground
surface waves seen, objects thrown in the air. All constructions
destroyed. |
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