第54回ジオダイナミクスセミナー
　　　Geodynamics　Seminar

要　旨
　Reproducing plate tectonics in the mantle convection system is an important issue in the numerical studies of mantle convection. We have developed self-consistent dynamical models of 2-D plate-mantle convection coupled system to examine the dynamics of initiation and longevity of the plate subduction at the continent-ocean or ocean-ocean boundary. We focus our attentions on the effect of: (1) the strength of the plate; (2) age of subducting plate; (3) existence of the asthenosphere. We use history-dependent yielding to realize finite deformation at the plate boundary. This results in the subduction-like one-sided structure as well as by introducing heterogeneity of the surface layer (i.e., continental and oceanic lithospheres). Details of the results and their geophysical implications will be discussed at the seminar.




　　　　　　　　問い合わせ先：山崎　大輔 　TEL　　　（089）927-8408
　　　 　　　　　　　　　　　　　　　　E-mail　　yamazaki@sci.ehime-u.ac.jp