In the second part of chapter two , the form and classification of crack is discussed in detail , reducing the formulae of the crack ' s spread velocity , controlling the forward spreading of the cracks based on the theory of rupture mechanics
2.
( 4 ) the collision zones of eurasia are very complicated due to the extrusion of continent lithospheres and the subduction between the oceanand continent lithospheres , and we analyze the mutual effects of different lithospheres and the crustal deformation features of collision zones ( 5 ) firstly we give the present - day spreading velocity of the mid - atlantic ridge
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