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Pastimes : The Case for Nuclear Energy
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To: TimF who wrote (218)3/15/2011 8:18:45 PM
From: Jacques Chitte2 Recommendations  Read Replies (1) of 312
 
While the overall magnitude of the Sendai offshore event is currently listed as Richter 9.0, the important number here is ground acceleration. Since the epicenter was 130 km offshore, max ground accelerations on Japanese land were between 0.25 and 0.30 g. (map, slideshare.net )

A locally severe earthquake will have ground acceleration up to or beyond 2.0 g. There was one in China some decades ago that had such severe ground motion - stories relate people being thrown out of their beds by the severity of the shock, just before the buildings fell onto them.

Afaik the real problem for Japan's reactors wasn't the quake's ground motion but the tsunami. We have yet to witness the effect of severe ground shock on an older-design reactor.
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