智利地震和中国的建筑
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杂谈 |
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The following describes the typical effects of earthquakes of various magnitudes near the epicenter. This table should be taken with extreme caution, since intensity and thus ground effects depend not only on the magnitude, but also on the distance to the epicenter, the depth of the earthquake's focus beneath the epicenter, and geological conditions (certain terrains can amplify seismic signals).
| Richter magnitudes | Description | Earthquake effects | Frequency of occurrence |
|---|---|---|---|
| Less than 2.0 | Micro | Microearthquakes, not felt. | About 8,000 per day |
| 2.0-2.9 | Minor | Generally not felt, but recorded. | About 1,000 per day |
| 3.0-3.9 | Often felt, but rarely causes damage. | 49,000 per year (est.) | |
| 4.0-4.9 | Light | Noticeable shaking of indoor items, rattling noises. Significant damage unlikely. | 6,200 per year (est.) |
| 5.0-5.9 | Moderate | Can cause major damage to poorly constructed buildings over small regions. At most slight damage to well-designed buildings. | 800 per year |
| 6.0-6.9 | Strong | Can be destructive in areas up to about 160 kilometres
(100 |
120 per year |
| 7.0-7.9 | Major | Can cause serious damage over larger areas. | 18 per year |
| 8.0-8.9 | Great | Can cause serious damage in areas several hundred miles across. | 1 per year |
| 9.0-9.9 | Devastating in areas several thousand miles across. |
1 per 20 years | |
| 10.0+ | Epic | Never recorded; see below for equivalent seismic energy
yield. |
Extremely rare (Unknown) |
(Based on U.S. Geological Survey documents.)[5]
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