Triangle diagrams: ternary graphs to display similarity and diversity of earthquake focal mechanisms

by Cliff Frohlich
Physics of the Earth and Planetary Interiors ()


This paper presents a new method for displaying focal mechanisms — plotting them on a ternary graph or ‘triangle diagram’ where the vertices represent normal, thrust, and strike-slip focal mechanisms. This method also provides a natural way for determining the relative proportions of thrust, normal, and strike-slip motion for any particular earthquake focal mechanism.

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