Abstract：Seismic source is an important part in the exploration of oil and gas resources and microseismic monitoring.Based on the equations of loading source on pressure source,shear source and centralized source,the authors obtained seismic snapshots in isotropic medium through triggered-grid finite difference scheme simulating and discussed in detail pattern characteristics of wave excited sources so as to choose the most suitable source to save the exploration cost.The authors analyzed in detail the mechanism of excited seismic sources from wave polarization theory of physics and,together with the analytical solution,verified the results of numerical simulation.It is concluded that the force is the controllable factor of obtaining seismic source field,the source used in 3-D fracture media can observe shear splitting,and physical analysis is a kind of verification method for explaining the pattern of seismic wave.
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