SEGJ Technical Conference

Extension of the Gassmann-Biot theory of porous media (Part 9) Boundary waves of a planar ze-ta crack in infinite fluid filled porous media

Abstract In the previous paper(2010 Spring Meeting), we reported that two kinds of Rayleigh waves exist in a half space porous media. This paper reports that two kinds of boundary waves similarly exist on a planar zeta-crack within infinite media. The 1st kind boundary wave is generated by the 1st kind dilatational wave and rotational wave, and the 2nd kind boundary wane is generated by the 2nd kind dilatational wave and the rotational wave. The 1st kind boundary wave may correspond to the dip-slip front propagation (velocity 2.0 km/s) which follows the fracture front propagation (velocity 2.7 km/s), and the 2nd kind boundary wave may correspond to the aftershock front propagation (velocity 0.5 km/s) which were observed in the huge 2004 Sumatra-Andaman earthquake (Mw=9.2).