Efficient S-Wave Generation in the Presence of Near-Surface Layers

P175 EFFICIENT S-WAVE GENERATION IN THE PRESENCE OF NEAR-SURFACE LAYERS Summary 1 Finite-difference simulations were performed to investigate the generation of shear waves using a buried exploding source. Effects that were studied included depth of the source below the freesurface and the near-surface layering. Conversion at the free-surface appears to be quite efficient and is stronger than the conversion at the deep reflector. The former (pSS) needs simpler processing and may thus be an attractive alternative to the latter (PS) for exploration. Introduction YANN GOURVIL KABIR ROY-CHOWDHURY and JAAP MONDT Applied Geophysics Group Utrecht University Budapestlaan 4 3584 CO Utrecht