The ancient Farallon plate subducted under North America in two distinct stages. High-resolution tomographic images show large pieces of the plate, including the currently active piece, which descends from the Pacific Northwest coast to 1,500 km depth, and its stalled predecessor, which now occupies the transition zone and lower mantle beneath the eastern half of the continent.
- Karin Sigloch
- Nadine McQuarrie
- Guust Nolet
