Lateral variation of Rayleigh wave dispersion character

Summary Group velocities of Rayleigh waves were measured along various paths, nearly 200 in all, covering the continents of Eurasia and Africa and the Atlantic and Indian Oceans, using long period seismograms of the World-Wide Standardized Seismograph Network. Dispersion characters thus obtained were compared with standard disperision curves. Several maps showing the paths along which Rayleigh waves have similar dispersion character are presented. The results are compared with dispersion data obtained by other authors.On leave from the International Institute of Seismology and Earthquake Engineering, Tokyo, Japan