title: An explanation for the anomalous ultrasonic slow wave in underwater sand.
abstract: An explanation is given for the propagation time of the well-known anomalous ultrasonic slow wave observed in water-saturated sand using a three-layer elastic model. The rapid increase of elastic properties of sand with depth causes conversion of near-grazing underwater acoustic waves into multiple coupled shear and compressional waves.
authors.affiliation: Sonoquest Adv. Ultrasonics Res., Wellesley Hills, MA.
authors.forename: J R
authors.initials: JR
authors.lastname: Chamuel