Abstract
Travel times have been studied from the Longshot underground explosion detonated on Amchitka Island on October 29, 1965. The travel-time residuals of P waves at stations in azimuths from N10°E to N30°E around the source, are, on the average, larger by 1 to 2 sec than those at stations in adjacent azimuths. This observation suggests the existence of a low-velocity region having a limited spatial extent; a P-velocity contrast of 0.3 to 0.6 km/sec is estimated. This low-velocity region can be explained in terms of a lithospheric tearing beneath the Aleutian arc and of a subsequent intrusion of low-velocity material from the underlying asthenosphere. The lithospheric tearing is considered to have been caused by bending of the oceanic lithosphere at a markedly curved portion of the Aleutian arc.
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