Alan C. Jones 1978 <p>Using observations by Raitt and Shor, Hess (1964) noted that there was a correlation of compressional wave velocity in the mantle with seismic profile direction, suggesting that seismic anisotropy existed over a broad area of the Pacific basin. This paper describes a system developed and used to look for the existence and extent of this seismic anisotropy.</p> application/pdf 10.3133/ofr79854 en U.S. Geological Survey Instrumentation for obtaining seismic anisotropy data from ocean bottom using moored sonobuoys reports