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Originally posted by Cecilofs
reply to post by C64Warrior
Thanks for the links and graphs. That is interesting - I wonder if there is any other explanation? Other Earthquake sites say that its just our detection mechanisms that have constantly been improving over the last century, but that graph clearly shoes a "hole" from around 1975 to 2000 during which there were very few >7 earthquakes.
Also interestingly, there were plenty of massive Earthquakes reported since 1900-1975 (more than between 75 and 2000), so that raises the question of wether this claim of reporting and detection increasing is accurate.
Was there anything happening in the world that meant earthquakes were not reported? Just seems strange that there would be a 25-year "hole", but I don't know much about the geology during that period either.
P.S. Do your original search but with Magnitude > 9. Just don't show it to your wife
Originally posted by leemachino
I noticed on the second map a 7+ near yellowstone. I'm glad there hasn't been any that big there in the past 30 years.