Intressanta jordbävningsfakta.

Jag letade lite statistik kring jordbävningar till ett föredrag och hittade något riktigt intressant. Kika på siffrorna och graferna för kvartal 1, 2011. Spännande tid vi lever i nu, eller kanske mer korrekt, spännande ändens tid...

 

källa: http://www.disasters.in/earthquake-situation-report-2011-q1

 

Earthquake Situation Report, 2011 Q1

Earthquake Summary, 2011, first-quarter

We are now a quarter the way through the year 2011, and it is time for a world update on earthquake numbers with relation to some historical averages.
Geological reference times are quite long, and modern day seismic monitoring systems are just that, modern day – relatively speaking. The USGS posts annual average earthquake numbers since 1990, so, that is what we will compare our results against.
Annual Average number of earthquakes since 1990
Magnitude 5 – 5.9 (1,319)
Magnitude 6 – 6.9 (134)
Magnitude 7 – 7.9 (14)
Magnitude 8+ (1)


One way to compare numbers is to calculate a year-to-date average number. As the year progresses, the numbers will become increasingly accurate.


Historical average number of earthquakes through the 90′th day of the year, since 1990,
Magnitude 5 – 5.9 (325)
Magnitude 6 – 6.9 (33)
Magnitude 7 – 7.9 (4)
Magnitude 8 + (0.25)
As of the 90′th day of 2011,
Magnitude 5 – 5.9 (754) 232 percent of ‘normal’
Magnitude 6 – 6.9 (80) 242 percent of ‘normal’
Magnitude 7 – 7.9 (7) 199 percent of ‘normal’
Magnitude 8 + (1) ‘normal’