The pacific plate and North American plate move along the San Andreas fault by 46 millimeters per year.
The oceanic tectonic plate known as the Pacific Plate is located below the Pacific Ocean. The biggest tectonic plate, Pacific Plate measures 103 million square kilometers.
At the triple junction between the Farallon, Phoenix, and Izanagi Plates, the plate first formed 190 million years ago. The Pacific Plate subsequently expanded to the point where it now forms the bulk of the Pacific Ocean basin. It also destroyed the Izanagi Plate by subducting it beneath Asia, leaving only a few remnants of the Farallon Plate and a small portion of the Phoenix Plate along the west coast of North America.
A hot spot inside the Pacific Plate is what gave rise to the San Andreas.
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