Note 4


When specifying the tR stress on the ridge trajectory, the ridge push is actually considered as a linear force applied at the divergent boundary. This approximation was adopted by some authors (e.g. see [Gölke and Coblenz, 1996; Richardson et al., 1979]). Apparently, a more adequate idea is to distribute this force over a band of a finite width adjacent to MAR. In particular, Parsons and Richter [1980] distributed the ridge push over an oceanic lithosphere younger than 40 Ma. The ridge push specification on the MAR axis is a reasonable approximation conforming to the purposes of the present work, because the push effects are analyzed at distances much larger than the width of the aforementioned band of young oceanic lithosphere.
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