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Gas pipeline builder plans precautions for spanning earthquake zones


At potentially active earthquake faults, the line likely will be raised above the ground and supported on crossbeams to let the pipe slide sideways or hop up and down without breaking during a tremor.
The model for how to blunt the destructive force of a big earthquake: The trans-Alaska oil pipeline. On Nov. 3, 2002, that line famously survived a magnitude 7.9 earthquake along the Denali Fault.
Unlike the oil pipeline, the gas line would not span the Denali Fault. But the $32 billion to $41 billion project, a partnership of TransCanada/ExxonMobil, would cross a seismically active region, and the companies recently reported how they plan to do so safely.

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