How many people must jump together to simulate an earthquake? Can jumping people change the characteristics of soil response? Those questions have been taken seriously in the past: in 2001 a nationwide experiment (Giant Jump) was planned in the United Kingdom. One million schoolchildren took part in a simultaneous jump at a fixed time. Seismographic recordings (http://www.planetscience.com/text_only/about_sy/events/jump/index.html) showed that the motion was noticeable within the buildings (schools, museums) where the experiment took place but faded quickly, leaving no traces at permanent seismographic stations.

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The project SESAME (Seismic Effects Assessment Using Ambient Excitations) WP02 (http://sesame-fp5.obs.ujf-grenoble.fr/) was designed...

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