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An estimated 800 quakes of magnitudes 5 to 6 occur worldwide each year. About 50,000 quakes of magnitudes 3 to 4 occur each year, and only about one of magnitude 8 to 9 each year. On the Richter Scale, between: 0.0 - 4.3: People at rest upstairs notice shaking. Shaking felt indoors; hanging objects swing. 4.3 - 4.8: Sleeping people are awakened. Dishes, doors and trees shake and rock. 4.8 - 6.2: Difficult to stand; people walk unsteadily. Windows break;plaster,bricks & tiles fall. 6.2 - 7.3: General panic. Damage to foundations; buildings destoyed. Water thrown out of river. 7.3 - 8.9: Total destruction; roads break up, rocks fall. Large cracks appear in ground. |
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