@article {li_modification_2021, title = {Modification of Crust and Mantle Lithosphere Beneath the Southern Part of the Eastern North American Passive Margin}, journal = {Geophysical Research Letters}, volume = {48}, number = {16}, year = {2021}, note = {_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1029/2020GL090555}, pages = {e2020GL090555}, abstract = {The eastern North American passive margin was modified by Mesozoic rifting. Seismic data from recent deployment of onshore and offshore stations offer a unique opportunity for studying the signature of syn-rifting and postrifting in lithospheric structures. Using full-wave ambient noise tomography, we construct a new seismic velocity model for the lithosphere of the southeastern United States. Our model confirms an oceanic-continental transitional crust over a \~{}70 km wide zone across the coastline. Our model reveals (a) a patch of lower-than-average mantle lithospheric velocities underlying this transitional crust and (b) a low-velocity column in the mantle lithosphere beneath the Virginia volcanoes. We propose that anomaly 1 represents cooled enriched mantle that underplated the thinning crust during the initial stages of rifting around 230 Ma. Anomaly 2 likely has a more recent origin in the Eocene and may result from an asthenospheric upwelling induced by a localized lithospheric delamination.}, keywords = {full-wave ambient noise tomography, lithospheric structure, the eastern North American passive margin}, issn = {1944-8007}, doi = {10.1029/2020GL090555}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1029/2020GL090555}, author = {Li, Cong and Gao, Haiying} }