Below the original graph posted on my blog in 2014
If we take USGS’s new data, which I down loaded on the 4th of April 2017 major quakes have been relatively stable since the 50’s and the big picture looks good.
This graph below is from my 2014 data if I use the new 2017 data we have a completely different picture as the graph above. Did USGS take historical data from the period 1900-1950 and place the data on the historical data of 1950-2000 to create a more stable graph?
Below a graph from my old 2014 data showing mag 6+ quakes per decade showing a more pronounced spike.
Conclusion; The total number of mag 6+ quakes officially on the USGS web site, from 1900 to the last day of 2016 which I downloaded and graphed in 2014 came to a total of 9181
If one was to do the same search now the total would be 10,998, from Jan 1st 1900 to the 31st of Dec 2016 the total would be 10,998 quakes.
What does that mean? Since 2014 when I did my original search an astonishing 1,817 mag 6+ quakes have been added.
Why would they add more quakes? Because if the data is put together in a graph it will make the graph appear more stable, more of a flat line, see below.
Take away the extra 1,817 quakes USGS have added since 2014 and you get a more true but scarier picture, with a massive increase clearly seen over the last 116 years, see below
Below a picture of my well worked data from 2014