underground burst

underground burst

[¦ən·dər¦grau̇nd ′bərst]
(ordnance)
The explosion of a nuclear weapon beneath the surface of the ground.
References in periodicals archive ?
The pavement had risen under the pressure of an underground burst.
Intermittent explosions of ash from the summit, believed to be driven by underground bursts of steam deep inside the throat of the crater vent, are occurring about twice a day, with smaller blasts in between, U.S.

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