Updating “the laws of convergence rate of plates” by Otsuki (1989)

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  • プレート収れん速度の法則（Otsuki, 1989）の更新
  • プレートシュウレンソクド ノ ホウソク(Otsuki, 1989)ノ コウシン

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<p>The empirical “laws of convergence rate of plates” proposed by Otsuki (1989) were updated based on a large amount of new data accumulated during the past 30 years, and the parameters of plate kinematics were revised to accord with new plate motion models. The configurations of deeply subducting slabs are described accurately, not only by seismic slab models but also by seismic tomography results. The deformation rates of overriding plates, which have been difficult to calculate precisely, were revised by new paleoseismological and geological investigations as well as the World Stress Map and GPS geodetic research. Excepting the zones of buoyant subduction, 28 subduction zones in total were reexamined. Four subduction zones with slab tips shallower than 200 km (Western Aleutian, West Honshu, South Solomon, and Puysegur) and four subduction zones in some abnormal tectonic situations (Lesser Antilles, North Kamchatka, Tonga, and Hellenic) were excluded. The remaining 20 subduction zones follow the very simple equations Va = Vo//a + Vs//a − 69 (R2 = 0.912) and Vt//a = 69 − Vs//a (R2 = 0.924), in mm/y, where Va denotes the deformation rate of the overriding plate (shortening is positive); Vs//a and Vo//a are subducting and overriding plate velocity components, respectively, parallel to Va (trenchward is positive); and Vt//a is the migration rate of the trench axis parallel to Va (oceanward is positive). These updates confirm that the “laws of convergence rate of plates” are robust.</p>

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