Upwarping is the broad, gentle arching or doming of the Earth’s crust, typically caused by tectonic forces or the isostatic response to the removal of overlying material. Upwarping is significant in understanding the formation of large-scale geological structures, the development of plateaus, and the processes of crustal deformation.
Reference: Wheeler, R. L., & Cramer, C. H. (2002). “Updated Seismic Hazard in the New Madrid Seismic Zone, Central United States.” Bulletin of the Seismological Society of America, 92(2), 663-682.