Introduction to quasi-P wave
Quasi-P wave (quasi-P wave): seismic waves propagating in anisotropic media, when the angle of incidence on the interface is not zero or 90°, the vibrations of P wave and SV wave are coupled together, and at this time P Both wave and SV wave have scalar and vector bits, which are different from pure P wave or pure SV wave in isotropic media, so they are called quasi-longitudinal wave and quasi-S-wave.