Measurement of apparent velocity and azimuth of seismic signals recorded at an array

A set of computer programs was written which enables one to determine automatically, the apparent velocity and azimuth of any portion of the seismic wave-train recorded at various seismic arrays. All that is required to use these programs is that the raw data be available on digital tape and that the user have access to any modern computer. The programs are written in Fortran IV and make use of the adaptive processing method whereby the arrival times of the wavefront at each sensor are accurately determined by cross-correlating the observed wavelet of interest with the corresponding wave on the beam trace. The new arrival times are then used to create a new and improved beam and the whole operation is repeated in an iterative manner until convergence takes place.