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EarthScope targets in the central Appalachians

Eastern US continental margin preserves the signature of several cycles of supercontinent assembly and breakup in the surface geology. To what extent have deep structures in the crust and mantle lithosphere persisted over this timeframe?

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EarthScope targets in the central Appalachians

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  1. Eastern US continental margin preserves the signature of several cycles of supercontinent assembly and breakup in the surface geology. • To what extent have deep structures in the crust and mantle lithosphere persisted over this timeframe? • Why has Appalachian topography persisted over long time period? EarthScope targets in the central Appalachians

  2. Central Appalachian swath: • Sharp gradients in Moho depths, perhaps corresponding with surface geologic structures (Benoit et al., in prep.). Possible magmatic underplating in lower crust? • Lateral transition in shear wave splitting behavior • Encompasses C. VA Seismic Zone (2011 Mineral, VA earthquake) • Encompasses youngest known volcanic rocks in the eastern US (Eocene basalts in and around Harrisonburg, VA) EarthScope targets in the central Appalachians

  3. EarthScope targets in the central Appalachians Mid-Atlantic Geophysical Integrative Collaboration (MAGIC): FlexArray deployment + geomorphology/geodynamics component

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