Tuesday, May 26, 2015

Shear Wave Propagation

When a seismic wave is reflected at a boundary , there is generally some conversion from compressional (P) waves to shear (S) waves and vice versa. The amount of conversion, which is zero at normal incidence , increases with increasing incident angle. A great deal of shear wave energy is generated when using surface sources on land. Therefore it is expected that some of the events which correspond to low velocity on the velocity analysis display represent not multiples but primaries that have travelled part of the path as shear waves.

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