Curvas Jeffreys-Bullen

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(jef’ rēys bul’ ∂n) Relationships between the arrival times of various modes of seismic waves and the distance (angular distance) from the epicenter of the earthquake that generated them. See Figure J-1. Named for Sir Harold Jeffreys (–1989), British geophysicist, and Keith Edward Bullen (1906–1976), Australian geophysicist.