What numbers would be considered on a moderate earth quake and a major one too?

Major would probably be a 8.0 or 9. One that is a 7 can be bad too. A moderate one from personal experience would be 4 or 5.

I was 10 when the Sylmar earthquake hit southern California and it was a 6.6. I lived about 40 miles south and it shook our house pretty good. Been through countless others.

Earthquake magnitudes are measured using the Richter Magnitude Scale. On this scale (ranging from 0-10), anything below 4.9 can cause some shaking, but usually doesn't cause damage. These are minor quakes.An earthquake ranging from 5.0 - 5.9 can cause significant damage to poorly constructed buildings, and strong quakes from 6.0 - 6.9 can be destructive in a 100 mile diameter.

7.0 -7. 9 magnitude earthquakes only occur about 180 times a year. These are substantially destructive.

Anything above that (8.0-10.0) is highly uncommon, or has never happened.

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