This brilliant animation by NOAA, featuring all the recorded earthquakes in the 20th Century, showcases just how active our planet is. Watch it, and feel awed, and small, in the best possible way.
– and I suspect even seasoned seismologists will be blown away by the animation they’ve produced.
First off, the number of recorded earthquakes seems to dramatically increase over time, particularly from the 1970s onwards. This isn’t because the planet is suddenly becoming more seismically active; it’s because around that time, seismometer tech, as well as telecommunications and signal processing tech, became significantly more advanced. As time ticked on, more seismometers were increasingly placed in seismically active and potentially treacherous parts of the world.
You can also probably spot that most earthquakes take place on a horseshoe-shaped ring around the Pacific Ocean. This is the so-called
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