Check out the first one or two chapters of a good structural geology or seismology textbook and you’ll find the derivation of the elastic stress tensor. Read further and, while you might find some application of the total tensor; more typically the tensor is quickly reduced to principal stresses. Then, the principal stresses get reduced even more to their components referenced to local earth coordinates.
KeywordsPrincipal Stress Focal Mechanism East African Rift Intraplate Earthquake Gulf Coastal Plain
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