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Monday, 12 February 2018

This Four-Ton Steel Ball Helps Calibrate Seismometers


This Four-Ton Steel Ball Helps Calibrate Seismometers
How do you know if your earthquake detector works? Well, creating an artificial quake is one way to check...

February 12, 2018 at 10:16PM
via Digg http://ift.tt/2BVkTbe
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