Japan Orders Nuke Operators to Prepare for Multi-Fault Mega-Quake

NISA orders nuclear operators to plan for multiple-fault quakes

Japan’s Nuclear and Industrial Safety Agency (NISA) ordered nuclear power plant operators on March 28 to prepare for the possibility of earthquakes involving multiple active faults that would cause significantly bigger shocks than previously envisaged.

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"If we are to think about the worst case, it is all too natural to have all (active faults) break at once," said one witness.

Power utilities have maintained, as they did before the March 11 disaster, that earthquakes are not likely to involve more than one active fault, but seismologists have criticized the position, saying it has no conclusive grounds.

[link to ajw.asahi.com]