Earth 'wobbled' before two major earthquakes
30 April 2020
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Nick Carne
It’s not clear, though, whether this will happen again.
The earth “wobbled” before two of the largest earthquakes in recent history, according to a new study, but it’s not clear whether this is likely to happen before the next one.
Geoscientists investigated recorded signals capturing the movement of global navigational satellite systems (GNSS) stations before the 2010 Maule earthquake in Chile (magnitude 8.8) and Japan’s Tohoku-oki earthquake in 2011 (9.0) and noted a strange reversal of ground motion.
The Tohoku-oki earthquake led to a devastating tsunami and the Fukushima nuclear meltdown.
Both events occurred at the Pacific Rim where oceanic plates dive beneath the continental crust in a process called subduction.
The researchers say geodetic analyses revealed that a 1000-kilometre-scale region of the Earth’s surface close to the plate boundary alternated its sense of motion over a period of several months directly leading up to both earthquakes.
More:
https://cosmosmagazine.com/uncategorized/earth-wobbled-before-two-major-earthquakes/
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