how often does a magnitude 8 earthquake occure (is it once a year or once every 5-10 years?)?

Question

magnitude 8 earthquake occure:
A. once a year
B. once every 5-10 years

Answer 1

There have been 14 mag. 8 earthquakes in the past 17 years. That's about once every 1.2 years. (This includes the mag. 9.1 on 12/26/2004.)

Since 1900, it's been about 1 or 2 a year; some years have none.

Answer 2

Over the entire Earth, the number of earthquakes with magnitudes of 8 and greater is less than one each year.

Answer 3

I opine that the occurance of earthquake along with their magnitude should never be estimated statisticaly. Because they do not fall in any specific time duration or in a periodical manner. They just occur when ever there is a tremendous release of energy.And any statitical estimate will only be misleading and getting things confused and complicated.

Answer 4

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