Mac Review Cast: PBS

Richter Magnitude Rating Scale

Micro - Microearthquakes, not felt.
About 8,000 per day

Minor.1 -Generally not felt, but recorded.
About 1,000 per day

Minor.2 - Often felt, but rarely causes damage.
49,000 per year (est.)

Light- Noticeable shaking of indoor items, rattling noises. Significant damage unlikely.

Moderate -Can cause major damage to poorly constructed buildings over small regions. At most slight damage to well-designed buildings.
800 per year

Strong - Can be destructive in areas up to about 100 miles across in populated areas.
120 per year

Major - Can cause serious damage over larger areas.
18 per year

Great.1- Can cause serious damage in areas several hundred miles across.
1 per year

Great.2 - Devastating in areas several thousand miles across.
1 per 20 years

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