Abstract
By adding one complex frequency (the real part for frequency and the imaginary part for damping factor) into the frequency-domain wave equation, the energy or amplitude after first-arrival wave can be damped. Therefore, the calculation of first-arrival traveltime and amplitude can be transformed into the picking of the maximum energy and its phase in the monochromatic wavefield. Then, the first-arrival traveltime and amplitude can be extracted from the phase and amplitude of monochromatic frequency-domain wavefield. In order to obtain the optimum combination of the frequency and damping factor, we propose the parameter analysis scheme to scan all possible combinations. The numerical examples are compared with finite-difference eikonal solvers and mostenergetic amplitude. The results show that our algorithm has good applicability to multi-shot and multi-receiver computation in complex media.
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