ST Alpha - "It's April and there have been 7 that are 7.0+ so far this year. That puts us on target for 21. I'm sure that's within one standard deviation of mean. -- nm" (Reading a Post)

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In response to ""Since 1900, there have been approximately 18 earthquakes of 7.0 or greater magnitude per year. (One usually crosses the 8.0 barrier.) There are no " by mara

It's April and there have been 7 that are 7.0+ so far this year. That puts us on target for 21. I'm sure that's within one standard deviation of mean. -- nm

Posted by Beryllium (aka grayman) Apr 6 '10, 16:09

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Or there could be none for the rest of the year. If you want to compare "this year so far," compare it with other 4-month periods. -- nm - mara Apr 6, 16:11 2
- from July 2009 to October 2009, it looks like it's about dead even with the current 4 month period. Anchored by a Sept 2 7.0 in Java -- nm - Beryllium Apr 6, 16:20 1
  - Sure, but I'll bet 4- or 10-month periods of more than average (and less than average) numbers are common since 1900. -- (link) - mara Apr 6, 16:23

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