pggriffiths Posted February 6, 2018 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?
pzkpfw Posted February 6, 2018 Posted February 6, 2018 Can even be directional: http://www.ancient-origins.net/ancient-technology/incredible-earthquake-detector-invented-nearly-2000-years-ago-001377
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