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Charles Francis Richter - Emphasis was usually put on...
Emphasis was usually put on the horizontal acceleration factor, for the simple reason that ordinary structures have a built-in safety factor for the vertical component; that is, gravity. (Charles Francis Richter)

Emphasis was usually put on the horizontal acceleration factor, for the simple reason that ordinary structures have a built-in safety factor for the vertical component; that is, gravity.

Charles Francis Richter

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acceleration component emphasis factor gravity horizontal ordinary reason safety simple vertical built-in

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