26 



HISTORY OF THE OCEANS 



3.5 



4.0 



SHEAR VELOCITY km/sec 

 4.5 5.0 



5.5 



6.0 



100 - 



200 



300 



DEPTH 

 km 



400 



500 



600 



700 



OCEAN- ALL MODELSx* 



CONTINENT/' 

 ALL MODELS 



DORMAN 8099-H 

 OCEAN RAYLEIGH 

 WAVES 



■— LEHMANN I 



CONTINENT RAYLEIGH WAVES 



LANDISMAN OCEANS VIM 

 OCEAN LOVE WAVES 



LANDISMAN 38 km XII 

 CONTINENT LOVE WAVES 



GUTENBERG — ^ 

 CONTINENT RAYLEIGH WAVES 



JEFFREYS-BULLEN 



± 



Fig. 9. Shear velocity vs depth, as deduced from studies of shear body waves, 

 Love waves, and Rayleigh waves. 



