February 6, 2014 – Global Earthquake by Month: I downloaded 8,482 earthquakes from the USGS website, from January 1, 1900 to February 4, 2014 and graphed them by month. The earthquakes ranged from 6.0 to 9.6 magnitude.
As you can see, February (2) was the low month and March (3) was the high month. Part of the reason for the variance between months could be due to the shorter number of days in February and longer number in months with 31 days. To account for this I graphed the average number of earthquakes per day as follows:
This smoothed out February, however, March (3) is still greater than two standard deviations above the mean. This is unusual. With 8,482 events in the database; the data should be evenly distributed. Why it is not is unknown.
Note: April 12, 2014 – I now know why March is so high. It’s because the download period included the Japan 11, 2011 event and that have close to 60 earthquakes in the 6.0 to 6.9 range. In contrast, the December 26, 2004 Mega-Quake and Tsunami had very few smaller warning “sixers” maybe six to eight.
(Credits – USGS and MS Excel).
The Master of Disaster