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How would a major earthquake on the southern half of Cascadia subduction zone impact the northern half?

Will a major earthquake on the southern half increase the chances of a major earthquake on the northern half? Or will it decrease the chances by relieving pressure?

How safe are houses and buildings with active gas lines?

Are gas lines designed to shut off to the entire city in the event of an earthquake to prevent massive fires?

How should we prepare for gas leaks?