Based on micro-seismic model, the forward simulation has been done for multi-wave field information to analyze the characteristics of various waves and further instruct the micro-seismic data processing and modify the velocity model.

In this paper, we suppose that the earth medium is viscoelastic, deduce a new formula about wave field extrapolation from Stock′s Equation,and analyze the cause that the up wave gradually loses its high frequency along with its propagation.

Snapshot of wave field trial result says that this kind of absorptive boundary condition brings good absorption effect except.

A wave equation method tracing wavefield propagation path is proposed with ray theory.

The paper adopted staggering-grid high-order finite-difference algorithm of elastic wave equation in non-homogeneous medium to carry out numeric simulation, and the elastic wavefield separation is finished by solving divergence and rotation for elastic wavefield at each moment of forward process, in which the divergence field mainly is P-wave and rotation field is mainly converted wave and S-wave.

This article applies the theory and method of engineering multi-wave seismic exploration and uses the DC_4 high-frequency multi-wave detector and single heft、3-heft energy exchangeer to do multi-wave observation experiments on the scared train-axle model.

According to the theory of the multi-wave seismis exploration, and due to the fact that the ultrasonic multi-wave metal detector cannot locate a crack and detect its, size and shape, this article studies the principle and characteristics of the ultrasonic multi-wave metal detector and also the 3-heft energy-exchange instrument in match with the ultrasonic multi-wave metal detector.