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GD5.2/EMRP4.18/SM6.6/TS6.11

Observations and modeling of subduction-driven deformation in the overlying plate and related feedbacks on the subduction process (co-organized)
Co-Conveners: Hiroshi Sato , Thorsten Becker 
Orals
 / Thu, 16 Apr, 08:30–10:00  / Room B10
Posters
 / Attendance Fri, 17 Apr, 10:30–12:00  / Blue Posters
Subduction modifies the overriding plate by fractionation, accretion, and tectonic deformation leading to orogeny, back-arc spreading, basin formation, or intraplate shear zone initiation. Such interactions are key examples how oceanic-oceanic plate boundaries evolve and how oceanic plates permanently modify continental plates, e.g., by introducing zones of weakness, delaminating lithosphere, or localizing strain within the Wilson cycle. In turn, the composition, strength, and morphology of the overriding plate, which may be the product of a long geological history for continents, affects subduction dynamics such as slab dip, and in turn regional and global plate velocities. Examples of recent geological settings that may bear witness to these processes include the Hellenic Arc/North Anatolian fault system, the Atlas Mountains of Morocco, the Sea of Japan, the Hikurangi convergent and extensional domains, the western U. S., and Colombia. We seek contributions from all fields, including geodesy, geology, geochemistry, seismology, and geodynamics, that document the evolution of overlying plate deformation, interpretations that tie subduction processes to this deformation, and numerical or analogue geodynamical modeling that quantify these coupled deformation processes.