“…Fewer experimental studies including compressional wave velocity measurements have been performed on unconsolidated porous media such as soils (Alramahi et al, 2008; Berge and Bonner, 2002; Bonner et al, 2001; Flammer et al, 2001; Marion et al, 1992; Tsukamoto et al, 2002; Velea et al, 2000). One area of research on soils, the study of marine sediments, has produced a number of laboratory and field studies that measure both the acoustic velocity and attenuation of these saturated unconsolidated porous materials (Moran et al, 2007; Muthukrishniah et al, 1995; Stoll, 1985; Turgut and Yamamoto, 1990). Even fewer studies have included attenuation in unsaturated soils (Leong et al, 2004; Liu et al, 2001; Lu et al, 2004; Oelze et al, 2002).…”