The traditional first breaks travel-time tomographic imaging is usually to add apparent constraint to model space from outside and carry out slipping process,which can destroy the correlation between model parameters and propagation operator,and is difficult to reach the g.

Study of travel time tomography by iterative Tikhonov regularization inversion;

Applications of the Crosswell Computer Tomography in Hydraulic Structures Detection;

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