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Viscoelastic Postseismic Rebound from Strike-Slip Earthquakes in Regions of Oblique Plate Convergence

Geodynamics Branch
NASA Goddard Space Flight Center
Greenbelt, Maryland 20771
301-614-6466
scohen{at}carnoustie.gsfc.nasa.gov

According to the slip-partitioning concept, the trench parallel component of relative plate motion in regions of oblique convergence is accommodated by strike-slip faulting in the overriding continental lithosphere. The pattern of postseismic surface deformation due to viscoelastic flow in the lower crust and asthenosphere following a major earthquake on such a fault is modified from that predicted from the conventional elastic layer over viscoelastic half-space model by the presence of the subducting slab. The predicted effects, such as a partial suppression of the postseismic velocities by 1 cm/yr or more immediately following a moderate to great earthquake, are potentially detectable using contemporary geodetic techniques.