Automatic First Break Picking of Blasting Vibration Signals Based on Modified Ensemble Empirical Mode Decomposition

In blasting engineering, in order to calculate the longitudinal wave velocity of the site rock mass with the help of the seismic wave excited by the existing explosive source, and at the same time consider the interference of the background noise, a method for automatically picking the first break of the blasting vibration signal is proposed, based on modified ensemble empirical mode decomposition, combined with the normalized energy concentration ratio of the autocorrelation function and the energy ratio of the vibration signal. An example is analyzed, and the results show that the method can accurately locate the first break of noisy blasting vibration signals and determine the longitudinal wave velocity of rock mass in the site accurately, which can be applied to the engineering practice of calculating the longitudinal wave velocity of rock mass by seismic wave method.