Resistivity Structure of the Alabama‐Oklahoma Lineament and Mississippi Embayment: Insights Into Crustal Weakness, Heat Flow, and Seismicity of the Region

Abstract The Alabama–Oklahoma Lineament (AOL) is a major crustal boundary that intersects the Mississippi Embayment (ME) and may influence intraplate deformation in the southern United States. We present the first regional magnetotelluric (MT) resistivity models across the AOL–ME system using EarthScope data and two‐dimensional inversion. All southwest–northeast profiles image a persistent northeast‐dipping conductive structure (50–100 Ω m) extending from the lower crust into the upper mantle (≥120 km depth), bounded by more resistive lithosphere (500–1,000 Ω m). This conductor aligns with the mapped trend of the AOL and Ouachita thrust belt, suggesting a lithosphere‐penetrating weak zone consistent with fossil subduction, long‐lived transform motion, and/or metasomatic alteration. West–East profiles reveal a separate, very low resistivity anomaly (