[ETL]

Meant to add this to my reply from a guy that says he assembled his chart from USGS data:

That's what my source says...

References:
1)The number and energy intensity of earthquakes in any given period are based upon records from USGS and other sources, including those recorded at http://earthquake.usgs.gov/

http://earth.webecs.co.uk/index.htm

[ForGod'sSake]

Well alright. Did you overlook the CENTENNIAL CATALOG or did you choose to ignore it??? That IS the source, FWIW...