pggriffiths Posted February 6, 2018 Share Posted February 6, 2018 Last week I in Britain was moving a fireplace and moved it back but was on a cable off balanced. Few hours later it fell. Could of been cars going past, could be a useful earth shift detector. Are earth quake detectors small? What do you think? Link to comment Share on other sites More sharing options...
pzkpfw Posted February 6, 2018 Share Posted February 6, 2018 Can even be directional: http://www.ancient-origins.net/ancient-technology/incredible-earthquake-detector-invented-nearly-2000-years-ago-001377 Link to comment Share on other sites More sharing options...
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