buffriddlers Kwakewatch

 This list makes Magnitude Strengths Easy To Follow.

Less than 2.0     Micro     Micro earthquakes, 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 mi) across in populated areas.     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 kilometres across.     1 per year
9.0–9.9     Devastating in areas several thousand kilometres across.
    1 per 20 years
10.0+     Massive     Never recorded, widespread devastation across very large areas; see below for equivalent seismic energy yield.
    Extremely rare (Unknown)