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A nonlinear tomography method is used that involves sequential inversion for model and hypocenter parameters. We image several velocity anomalies that persist through most of the inversion volume. Some anomalies support the presence of known features such as an ancient rift zone in northern Tennessee. Other anomalies reveal the presence of basement features that can be correlated with regional gravity and magnetic anomalies. We image a narrow, NE\u2010SW trending, steeply dipping zone of low velocities that extends to a depth of at least 24\u2009km and is associated with the vertical projection of the prominent New York\u2010Alabama magnetic lineament. The low\u2010velocity zone may have an apparent dip to the SE at depths exceeding 15\u2009km. The low\u2010velocity zone is interpreted as a major basement fault juxtaposing Granite\u2010Rhyolite basement to the NW from Grenville southern Appalachian basement to the SE. Relocated hypocenters align in near\u2010vertical segments suggesting reactivation of a distributed zone of deformation associated with a major strike\u2010slip fault. We suggest that the ETSZ represents reactivation of an ancient shear zone established during formation of the super continent Rodinia.<\/jats:p>","DOI":"10.1002\/2013jb010433","type":"journal-article","created":{"date-parts":[[2013,12,17]],"date-time":"2013-12-17T19:22:39Z","timestamp":1387308159000},"page":"464-489","source":"Crossref","is-referenced-by-count":20,"title":["Crustal velocity structure associated with the eastern Tennessee seismic zone: Vp and Vs images based upon local earthquake tomography"],"prefix":"10.1029","volume":"119","author":[{"given":"Christine A.","family":"Powell","sequence":"first","affiliation":[{"name":"Center for Earthquake Research and Information University of Memphis Memphis Tennessee USA"}]},{"given":"Mitchell M.","family":"Withers","sequence":"additional","affiliation":[{"name":"Center for Earthquake Research and Information University of Memphis Memphis Tennessee USA"}]},{"given":"Randel Tom","family":"Cox","sequence":"additional","affiliation":[{"name":"Center for Earthquake Research and Information University of Memphis Memphis Tennessee USA"},{"name":"Department of Earth Sciences University of Memphis Memphis Tennessee USA"}]},{"given":"Gordana","family":"Vlahovic","sequence":"additional","affiliation":[{"name":"Department of Environmental, Earth and Geospatial Sciences North Carolina Central University Durham North Carolina USA"}]},{"given":"Pierre","family":"Arroucau","sequence":"additional","affiliation":[{"name":"Center for Research Excellence in Science and Technology North Carolina Central University Durham North Carolina USA"}]}],"member":"13","published-online":{"date-parts":[[2014,1,21]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1029\/91JB00145"},{"key":"e_1_2_11_3_1","first-page":"410","article-title":"Precambrian basement geology of the Permian Basin region of west Texas and eastern New Mexico: A geophysical perspective","volume":"80","author":"Adams D. 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