Possible existence of small-scale convection under the back arc

Details Possible existence of small-scale convection under the back arc Possible existence of small-scale convection under the back arc

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29u..39h&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 21, pp. 39-1, CiteID 2043, DOI 10.1029/2002GL015853

Physics

Geophysics

6

Mathematical Geophysics: Modeling, Tectonophysics: Dynamics, Convection Currents And Mantle Plumes, Tectonophysics: Plate Boundary-General (3040)

Scientific paper

We discuss a possible existence of small-scale convection under the back arc, which may be a cause of recently proposed along-arc variation of thermal structure under northeastern Japan. Based on numerical simulations, we find that, under the situation of opening of Japan Sea, a possible existence of low viscosity layer (LVL) below the back arc makes the existence of small-scale convection be likely. A shear produced by the movement of subducting slab aligns the axes of convection roll perpendicular to the arc. To explain the observed wavelength of along-arc variation (~50 to 80 km), our preferred model requires a similar thickness of the LVL whose viscosity is two-orders of magnitude less than that of surrounding. Another notable feature is the upward movement of the mantle associated with the small-scale convection. We discuss the water released from the subducting crust as a possible origin of the LVL.

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