Physics
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3813308w&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 13, CiteID L13308
Physics
Seismology: Subduction Zones (1207, 1219, 1240), Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Heat Generation And Transport, Tectonophysics: Rheology: Mantle (8033), Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413)
Scientific paper
In the forearc mantle wedge, the thermal field depends strongly on slab-driven mantle wedge flow. The flow is in turn affected by the thermal field via the temperature dependence of mantle rheology. Using thermal modeling, we show that the nonlinear feedback between the thermal and flow fields always leads to complete stagnation of the mantle wedge over a shallow, weakened part of the slab-mantle interface and an abrupt onset of mantle flow further down-dip. The abrupt increase in flow velocity leads to a sharp thermal transition from a cold stagnant to a hot flowing part of the wedge. This sharp thermal transition is inherent to all subduction zones, explaining a commonly observed sharp arc-ward increase in seismic attenuation.
Rychert Catherine A.
Wada Ikuko
Wang Kelin
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