reply to post by saige45
You are absolutely correct. The graph shown by PlanetX is very misleading. Looking at it, one would think that over the past 2 decades there have been
a MASSIVE increase in the amount of earthquakes.
The truth is, it's not that the amount of earthquakes have increased, instead, our ability to detect even the smallest quakes that happen very deep
within the Earth is what has increased. Especially over the last 2 decades!
If one bothers to do the research on the history of earthquake detection and the Seismometer
you'll find that the seismometers used, even towards the last part of the 20th century were no where near as accurate or as sensitive as the
equipment that has since been used for the past 2 decades.
Couple that with the increase of connecting the networks with the internet (another thing to come out over the last 2 decades) so that information can
be shared, you have a LOT more data on earthquakes and the amount you can detect.
Because of this, it would make MUCH more sense to take a look at that graph and limit the time span to the past 20 years (however, considering how
fast technology advances, even then you have to be careful). Let's look at this chart here covering 1990 to 2010:
Source: British Geological Survey
(very good article there on whether or not earthquakes are increasing or not by the way).
As you can see, there is no increasing trend there at all for up to 2010. I'm sure if we do some more digging we can include 2011 and the first part
of 2012, you'll find the trend is still the same: not increasing.
This is something that really irritates me to no end: people using data that they don't understand, or do not know how read, nor do they take into
account changes in technology, and present it as proof of something.
I'd much rather they show it as ASK if it looks that way. Get input from others, and see if there might be a reason that a chart looks a certain way
or not (that or stop using charts that are made like that to mislead on purpose).