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Abstract The whole underground explosive destruction area is regarded as a seismic source of blast seismic wave. Based on the theory of explosive equivalent load and the destruction theory of area near explosion，the boundary loads on cavity are denoted by velocity of particle. A simplified calculation model of seismic source of underground explosion is presented. The ground response to underground explosion is transformed into the problem about propagation and reflection of spherical dilatation wave in elastic half-space. The propagation of explosive seismic wave in half-space is calculated by applying incomplete separation variable method，so the movement fields of response of ground particles are received. Based on numerical calculation，ground movement of underground explosions are analyzed quantatively showing that the maximum velocity of ground particles is subjected to exponential decay laws. Compared with empirical formulae from experiments at home and abroad，the calculation method is proved to be correct.
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Received: 23 April 2007
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