June 12, 2014 – Global Earthquakes, Tsunamis and Volcanoes over 39 Years: The table below reflects the events plotted on the graph above. The NOAA database was used in all cases. Volcanoes plotted cover 6,372 years; Tsunamis 3,422 years and Earthquakes 39 years. I have a large database of significant historical quakes; however, to keep the sample size roughly equal, I used the 354 event file. The actual events plotted above were files reduced for rough equivalency as follows: Earthquakes = 354, Tsunamis = 300 and volcanoes = 127.
I ran a correlation analysis on all three files. EQ to Tsunamis = 54%, EQ to Volcanoes = 24% and Tsunamis to volcanoes = 16%. In other words, about half the time, when there is a large earthquake it is associated with a significant tsunami. The Indonesian mega-quake and tsunami of December 26, 2004 and Japan on March 11, 2011 are recent examples.
However, only one-quarter of the time is a volcano associated with a large earthquake. Tsunamis and volcanoes are even less correlated (16%).
The graph below shows large global earthquakes, Tsunamis and Volcanoes by month. Note that volcanoes peak in August (Leo) and then drop off significantly. Large earthquakes peak in October and November. Tsunamis are more evenly distributed, with minor peaks in august and September.
The graph below shows the same data distributed by day of the month. Using the month and day graphs, discloses high probability times. For example, volcanoes peak in August. Looking at the day graph, the 17th of the month is the highest point. Therefore, expect large volcanic events on August 17th. Using the time graphs below, you can even forecast the time. August 17th at between 5:00 and 5:59AM for Japan.
The graph below shows large earthquakes for Japan and Peru by hour of the day. This type of study can only be performed on these two countries because they both only have one time zone (during the time of these events).
The red and blue lines are exponential best fit lines. Major earthquakes in Peru tend to occur between 9:00AM and 9:59AM (note the high peak on the graph for this time). For Japan the peak is at 5:00AM to 5:59AM.
These are but a few of the thousands of graphs I have prepared on earthquakes, volcanoes and tsunamis.