Triple junction

Meeting point of three tectonic plates

A triple junction is the point where the boundaries of three tectonic plates meet. At the triple junction each of the three boundaries will be one of three types—a ridge (R), trench (T), or transform fault (F)—and triple junctions can be described according to the types of plate margin that meet at them (e.g., fault–fault–trench, ridge–ridge–ridge, or abbreviated F-F-T, R-R-R). Of the ten possible types of triple junctions, only a few are stable through time (stable in this context means that the geometrical configuration of the triple junction will not change through geologic time).

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