Geologists find that mega-quakes strike only on relatively flat, smooth-moving sections of fault. Such faults run alongside Indonesia, Japan up to Kamchatka, the Aleutians to Alaska, Cascadia (along the north-west coast of North America), Central America, and the entire coast of South America.

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Geologists find that mega-quakes strike only on relatively flat, smooth-moving sections of fault. Such faults run alongside Indonesia, Japan up to Kamchatka, the Aleutians to Alaska, Cascadia (along the north-west coast of North America), Central America, and the entire coast of South America.