Modelling of blast vibrations

A hybrid method for modelling the time history of blast vibrations from production blasts is developed. The seismic signal produced by the detonation of a single hole charge is recorded in situ. This record contains information about the complex mechanism of radiating seismic energy from an explosive source as well as the filtering effect of the travel path of the signal. Assuming a linear superposition of the seismic effects of the individual holes in a row shot, the vibrations produced by a production blast are simulated. The single shot signal is convolved with an impulse series that represents the firing sequence. By a systematic variation of firing times in the simulation procedure, their effects on the vibrations are studied. The peak amplitudes of vibrations can be reduced. The application of an electronic initiation system allows the realization of optimized firing times in production blasts and a successful validation of the synthetic seismograms.