An oceanic plateau, the Yakutat terrane, has entered the subduction system across southcentral Alaska. Its down‐dip fate and relationship to overlying volcanism is still debated. Broadband seismometers from the Wrangell Volcanism and Lithospheric Fate (WVLF) temporary experiment were deployed with <20 km spacing across southcentral Alaska to study this region. An array‐based deconvolution procedure is used to isolate the scattered P and S coda of teleseismic P waves for imaging discontinuity structure. This procedure is applied to WVLF and other dense seismic arrays across southcentral Alaska in a manner that accounts for near‐surface wavespeed variations. Two imaging techniques are employed: two‐dimensional migration and three‐dimensional common‐conversion‐point (CCP) stacking. Migrating the scattered phases along WVLF stations shows the ∼18 ± 4 km thick Yakutat crust subducting beneath the Wrangell Volcanic field to the NNE. It is offset from the Alaska‐Aleutian seismic zone laterally by 250 km to the southeast at 100 km depth, and dips more steeply (45°). At depths <45 km, CCP stacking reveals that the Yakutat crust is continuous for over 450 km along strike. This shallow continuity and deeper offset suggest a tear in the subducting Yakutat slab at depths >45 km, around 146°W. CCP stacking also reveals a continuous thin low‐velocity layer atop the underthrust Yakutat crust for >450 km along strike, at all depths <35 km. The uniform low‐velocity thrust zone indicates consistent properties through multiple rupture‐zone segments, showing that low‐velocity channels generally correspond with subduction megathrusts.

Arc volcanism and intermediate-depth earthquakes are prolific at subduction zones and appear linked in some way. Alkaline and calc-alkaline magmas, typical of arc volcanism, show geochemical signatures which imply an influence of fluids derived from the subducting plate (Stern, 2002), and the metamorphic devolatilization that releases those fluids has been implicated in intermediate-depth earthquakes generation (Hacker et al., 2003). Although in many places arc volcanoes directly overlie prolific intermediate-depth earthquakes regions (e.g., Syracuse & Abers, 2006), some exceptions have been used to infer more exotic causes of calc-alkaline volcanism. One such region is the Wrangell volcanic field (WVF) in southcentral