1971•Journal of Physics of the EarthOpen access

An Epicenter Study of the Underground Nuclear Explosion Long Shot

Alvaro Felipe Espinosa

Abstract

P wave arrival times from the Long Shot underground nuclear explosion are used to systematically study its hypocenter and origin time. Azimuthal variations are shown to exist. If observations in the range 0°≤Δ≤30° are excluded in the analysis, the epicenter location is strongly biased. The adopted epicenter is 17km NW using 0°≤Δ≤105° observations. The solutions using observations in the ranges 0°≤Δ≤25° and 0°≤Δ≤35° are 11 and 9 km, respectively.

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Key concepts: Epicenter, Hypocenter, Seismology, Geology, Shot (pellet), Azimuth, Nuclear explosion, Geodesy