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Dynamic support of the outer rise
Author(s) -
Melosh H. J.
Publication year - 1978
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl005i005p00321
Subject(s) - lithosphere , trench , geology , subduction , geophysics , lithospheric flexure , seismology , viscosity , tectonics , layer (electronics) , materials science , composite material
A model for the origin of the outer rise is proposed which does not require multi‐kilobar deviatoric stresses in the lithosphere. The model includes stresses developed by viscous flow of the lower part of the lithosphere as it is subducted. Besides the outer rise, features similar to an oceanic trench and island arc develop in the model. The elastic upper part of the lithosphere, treated approximately, is subject to extensional stresses on the seaward side of the trench axis. The observed topography of an oceanic trench and outer rise can be produced by a 90 km thick lithosphere subducting at 60 mm/yr if the average viscosity of the lower lithosphere is about 10 23 poise.