In the case of a heterogeneous medium one must use a generalization of the van Cittert Zernike theorem, called Hopkins's formula.
2.
Backus presented an equivalent medium theory, a heterogeneous medium can be replaced by a homogeneous one which will predict the wave propagation in the actual medium.
3.
Chapters outline basic theorems in dynamic elasticity, representation of seismic sources, elastic waves from a point dislocation, plane waves in homogeneous media and their reflection and transmission at a plane boundary, reflection and refraction of spherical waves; Lamb's problem, surface waves in a vertically heterogeneous medium, free oscillations of the Earth, body waves in media with depth-dependent properties, the seismic source : kinematics, the seismic source : dynamics, and principles of seismometry
मोबाइल