Making Artificial Earthquakes with a Four-Tonne Steel Ball

In Göttingen, Germany, there’s a four-tonne steel ball that can be raised up a 14-metre tower — and then dropped in less than two seconds, crashing back to earth. It makes tiny, artificial earthquakes: here’s why. Thanks to all the team at Wiechert’sche Erdbebenwarte Göttingen! You can find out more about them here: https://www.erdbebenwarte.de/ Three things I had to cut out of this video, because they didn’t quite fit into the story or because I couldn’t film them: The reason the steel ball survived two world wars is because the university’s records listed it by use as a “rock-ball”, not by composition as a “steel ball” – so no-one melted it down for weaponry. The observatory team refill that pit every year to make the ground flat, and the ball just digs a hole again. The rock’s just being compressed underneath. They joke that, somewhere in Australia, there’s a slowly growing hill… And finally, the ground steams for a little while after the ball hits: it gets rather warm… Edited by Michelle Martin (@mrsmmartin) I’m at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as…

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In Göttingen, Germany, there’s a four-tonne steel ball that can be raised up a 14-metre tower — and then dropped in less than two seconds, crashing back to earth. It makes tiny, artificial earthquakes: here’s why.

Thanks to all the team at Wiechert’sche Erdbebenwarte Göttingen! You can find out more about them here: https://www.erdbebenwarte.de/

Three things I had to cut out of this video, because they didn’t quite fit into the story or because I couldn’t film them:

The reason the steel ball survived two world wars is because the university’s records listed it by use as a “rock-ball”, not by composition as a “steel ball” – so no-one melted it down for weaponry.

The observatory team refill that pit every year to make the ground flat, and the ball just digs a hole again. The rock’s just being compressed underneath. They joke that, somewhere in Australia, there’s a slowly growing hill…

And finally, the ground steams for a little while after the ball hits: it gets rather warm…

Edited by Michelle Martin (@mrsmmartin)

I’m at http://tomscott.com
on Twitter at http://twitter.com/tomscott
on Facebook at http://facebook.com/tomscott
and on Snapchat and Instagram as tomscottgo

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