July 19, 2012 – 5,382 Global Earthquakes by Day of the Week: I downloaded all global earthquakes, greater than or equal to (>=) 6.0 Magnitude, from January 1, 1973 to July 18, 2012 and graphed them by day of the week (below). Clearly, more quakes occur on Saturday. 
Tuesday (Tu) and Thursday (Th) were low days. The yellow horizontal line in the graph is the exponential best fit line. This has an upward bias to the left, i.e., there are more earthquakes later in the week than earlier. Saturday (Saturn’s Day) was one and one-half standard deviations above the mean, which makes it an anomaly. Why this is, I do not know? (Credits: Data – USGS, Graph – W. G. Foster)
The Master of Disaster
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About wfoster2011
Disaster researcher and current financial and economic news and events: Accidents, economics, financial, news, nature, volcanoes, floods, earthquakes, fires; airplane, ship & train wrecks; tornadoes, mine cave-ins, hurricanes, pestilence, blizzards, storms, tzuami's, explosions, pollution, famine; heat & cold waves; nuclear accidents, drought, stampedes and general.
Futures trader using high volume and open interest futures markets. Also, a financial, weather and mundane astrologer with over 30 years of experience.
Three University degrees from California State University Northridge:
BS - Accounting
MS - Busines Administration
BA - Psychology
Served in the U. S. Army as an Armored Platoon Leader in the 5th Battalion, 68th Armored Regiment, 8th Infantry Division (Retired).
Have published three books and 36 articles available for sale through my blog:
Commodology - Secret of Soyobeans (Financial Astrology)
Timing is the Key (Financial Astrology)
Scum City, a fiction novel (no longer available, under contract to major publisher)
Currently resident of Las Vegas, NV, USA
Interesting and I am stumped for an explanation. May I enquire as to which catalogue you used for the data?
I put a search into ANSS
Your search parameters are:
catalog=ANSS
start_time=1973/01/01,00:00:00
end_time=2012/07/19,09:23:23
minimum_magnitude=6.0
maximum_magnitude=10
event_type=E
The result was 4775 – which I am sure won’t affect the distribution – but I am just curious.
I used the USGS.GOV earthquake database site, using the same parameters as you did, and got 5,394. I then tried NOAA.GOV and got only 839. Why ANSS has only 4,775 during the period is a mystery to me. Plus, I would think the NOAA would be very accurate – why so few, I do not know? To answer your question, I used the usgs catalogue.
yours,
Bill