Fault dislocation driven by the hoop stress associated with the P wave from an underground explosion is proposed as a mechanism for tectonic stress release. The mechanism is examined in two-dimensional numerical simulations. Determined initial value problems can be posed, from which plots of near-field motion are obtained. If tectonic stress is near the limit allowed by friction, then sliding can explain observed SH amplitudes. The source-time functions of both the explosion and the dislocation are equivalent to step functions at long periods. The corner period for the dislocation is less than 1 sec for low-yield explosions with relative double-couple strengths less than 1.0.

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