Wavefield Migration Imaging of Moho Geometry and Upper Mantle Structure Beneath Southern New England

The crust and upper mantle beneath the New England Appalachians exhibit a large offset of Moho across boundary between Laurentia accreted terranes several dipping discontinuities, which reflect Paleozoic or younger tectonic movements. We apply scattered wavefield migration to SEISConn array deployed northern Connecticut obtain insights not previously available from receiver function studies. resolve doubled at imaged offset, may westward thrusting rifted Grenville crust. image suggests laterally variable velocity contrasts Moho, perhaps reflecting mafic underplating during continental rifting. A west-dipping feature in lithospheric is further constrained have slab-like geometry, representing relict slab subducted an Appalachian orogenic event. Localized low seismic velocities eastern portion indicate that Northern Anomaly extends relatively far south.