[DTfan]

Description

Richter Magnitudes

Earthquake Effects

Frequency of Occurrence

Micro

Less than 2.0

Microearthquakes, not felt.

About 8,000 per day

Very minor

2.0-2.9

Generally not felt, but recorded.

About 1,000 per day

Minor

3.0-3.9

Often felt, but rarely causes damage.

49,000 per year (est.)

Light

4.0-4.9

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

6,200 per year (est.)

Moderate

5.0-5.9

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

800 per year

Strong

6.0-6.9

Can be destructive in areas up to about 100 miles across in populated areas.

120 per year

Major

7.0-7.9

Can cause serious damage over larger areas.

18 per year

Great

8.0-8.9

Can cause serious damage in areas several hundred miles across.

1 per year

Rarely, great

9.0 or greater

Devastating in areas several thousand miles across.

1 per 20 years


(Adapted from U.S. Geological Survey documents.)

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