Tracking North America: Long‐term Observation to Build on the Legacy of USArray

West, M., S. Bilek, P. Boden, G. Kent, K. Koper, W.‐Y. Kim, N. Ruppert, V. Tsai, and J. Vidale (2015). Tracking North America: Long‐term Observation to Build on the Legacy of USArray, whitepaper for workshop on Future Seismic and Geodetic Facility Needs in the Geosciences, Leesburg, Virginia, May 4‐6, pp. 1‐2.