Earthquakes and the The Richter Scale

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Level of damage The Richter Scale
No damage. ≤ 4.3
Rather Strong. Damage negligible. Small, unstable objects displaced or upset; some dishes and glassware broken. 4.4 – 4.8
Strong. Damage slight. Windows, dishes, glassware broken. Furniture moved or overturned. Weak plaster and masonry cracked. 4.9 – 5.4
Very Strong. Damage slight-to-moderate in well-built structures; considerable in poorly-built structures. Furniture and weak chimneys broken. Masonry damaged. Loose bricks, tiles, plaster, and stones will fall. 5.5 – 6.1
Destructive. Structure damage considerable, particularly to poorly built structures. Chimneys, monuments, towers, elevated tanks may fail. Frame houses moved. Trees damaged. Cracks in wet ground and steep slopes. 6.2 – 6.5
Ruinous. Structural damage severe; some Structures will collapse. General damage to foundations. Serious damage to reservoirs. Underground pipes broken. Conspicuous cracks in ground; liquefaction. 6.6 – 6.9
Disastrous. Most masonry and frame structures/foundations destroyed. Some well-built wooden structures and bridges destroyed. Serious damage to dams, dikes, embankments. Sand and mud shifting on beaches and flat land. 7.0 – 7.3
Very Disastrous. Few or no masonry structures remain standing. Bridges destroyed. Broad fissures in ground. Underground pipelines completely out of service. Rails bent. Widespread earth slumps and landslides. 7.4 – 8.1
Catastrophic. Damage nearly total. Large rock masses displaces. Lines of sight and level distorted. > 8.1

Source: Federal Emergency Management Agency