Here is one study . Two random dates were taken
1)23rd June 2006
2)30th June 2010 nearly 4 years apart
A list of 6.5+ quake was search on USGS
There are total 204 such quakes
We have ,say, a range from 0 kms to 700 kms ie a range of 700 kms
If these quakes were equally distributes , each 100 kms should have around 30 such 6.5+ quakes per 100 km depth
What I found , (as expected -supporting my hypothesis ) that between 300 to 500 kms there are minimum quakes -just three -
a) 6.6 at PNG on 20th March 2010...at depth of 414kms
b) 7.3 on 24th November 2008-at Russia ...at depth..492 kms
C) 6.8 on 16th July 2007 at Japan at.....35. kms
Now the question to plate tectonics is ...
Instead of 60 quakes ( 30/100 km x 2) why there are only 3 quakes of 6.5+?
Even there are more quakes ,deeper to this ie 550 to 700 kms and much more between 10 to 100 kms
Why only this patch is left out ?
My hypothesis even , intend to suggest that ,there is something wrong with the depth evaluation of these three quakes even
Theoretically there should not be a single major quake in the range of 300 kms to 500 kms
As usual answer will be posted tomorrow
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