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Earthquake basic parameters and characteristics
| Mag-nitude | Descrip-tion | Intensity | Average earthquake effects | Average frequency of occurrence (estimated) |
| > 2.0 | Micro | I | Microearthquakes, not felt, or felt rarely by sensitive people. | Continual/ several million / year |
| 2.0–2.9 | Minor | I to II | Felt slightly by some people. No damage to buildings. | > 1 million / year |
| 3.0–3.9 | II to IV | Often felt by people, but very rarely causes damage. Shaking of indoor objects can be noticeable. | > 100,000 / year | |
| 4.0–4.9 | Light | IV to VI | Noticeable shaking of indoor objects and rattling noises. Felt by most people in the affected area. Slightly felt outside. | 10,000 - 15,000 / year |
| 5.0–5.9 | Mode rate | VI to VIII | Can cause damage of varying severity to poorly constructed buildings. At most, none to slight damage to all other buildings. Felt by everyone. | 1,000 - 1,500 / year |
| 6.0–6.9 | Strong | VII to X | Damage to a moderate number of well-built structures in populated areas. Strong to violent shaking in epicentral area. Death toll ranges from none to 25,000. | 100 - 150 / year |
| 7.0–7.9 | Major | VIII or greater | Causes damage to most buildings, some to partially or completely collapse or receive severe damage. Felt across great distances with major damage mostly limited to 250 km from epicenter. Death toll ranges from none to 250,000. | 10 - 20 / year |
| 8.0–8.9 | Great | Major damage to buildings, structures likely to be destroyed. Will cause moderate to heavy damage to sturdy or earthquake-resistant buildings.Death toll ranges from 1,000 to 1 million. | 1/ year | |
| 9.0 and > | Near or at total destruction - severe damage or collapse to all buildings. Heavy damage and shaking extends to distant locations. Death toll usually over 50,000. | 1/ 10 to 50 years |
Table 2.2
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