First-arrival traveltime and amplitude calculation from monochromatic two-way wave equation in frequency domain

作者：Qin YL^*; Zhang ZJ; Shin CS; Ko S; Chen Y; Chen JY; Han U

来源：Chinese Journal of Geophysics, 2005, 48(2): 423-428.

• frequency-domain wave equation
• complex frequency
• first-arrival traveltime
• amplitude

By adding one complex frequency (real part is frequency and the imaginary part is damping factor) into the frequency-domain wave equation, the energy or amplitude after first-arrival wave can be damped. Therefore, the first-arrival traveltime and amplitude can be transformed into the pick of maximum energy and its amplitude 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 a parameter analysis scheme for all possible combinations. The numerical examples are compared with finite-difference eikonal solvers and most-energetic amplitude. The results show that our algorithm has good applicability to multi-shot and multi-receiver computation in complex media.

• 出版日期2005-3