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