October 8, 2013 – Days with More Than One Earthquake: The graph above reflects days from January 1, 1973 to October 7, 2013 with more than one earthquake. In other words, there were 743 days with two earthquakes greater than or equal to a 6.0 magnitude quake. A total of 159 days saw three quakes, 42 had four tremors, 9 days had five quakes, et cetera. There were 4,542 with one quake.
I did not show March 11, 2011. That day saw the 9.0 magnitude mega-quake and tsunami with 41 quakes greater than or equal to 6.0 magnitude. On that day there was the main 9.0M shock, a 7.9M, 7.7M and many 6.XM quakes as shown in the chart below.
Because this quake occurred only two and one-half years ago there are many YouTube videos of this awesome and frightening event. Here are two of the Japan tsunami. Video #1 is an aerial view from a helicopter, while Video #2 is from a building and shows the incredible power and destructiveness up close
(Credits – Data USGS, Narrative W. G. Foster, Video Youtude).
The Master of Disaster