P-S CONVERTED WAVE: CONVERSION POINT AND ZERO-OFFSET ENERGY IN ANISOTROPIC MEDIA

Abstract

Here, we analyze two aspects related to converted-wave seismology: the conversion point problem and the zero-offset energy phenomenon. We show the anisotropy effect on the conversion point position and evaluate the error introduced in data processing due to neglecting anisotropy. We demonstrate that the location of the conversion point depends strongly on elastic properties of the media. The exact position of the conversion point can move relatively to the isotropic conversion point and can be located either inside or outside the vertical plane. Also, we discuss and demonstrate the possibility of recording PS zero-offset energy in horizontally layered media and how to predict some of anisotropy properties from field messurements.