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Compressional sound velocity, wet-bulk density, water content, porosity, and acoustic impedance and anisotropy were determined for Quaternary through Cretaceous sediment and rock recovered from 0 to 1000 meters below the sea floor at Deep Sea Drilling Project Sites 315-318 on the Line Islands chain, Manihiki Plateau, and Tuamotu Ridge in the western Pacific Ocean. Regional correlations of these properties versus depth below sea floor are good for the Line Islands chain, the Manihiki Plateau, and the Tuamotu Ridge. Measurements were made under laboratory conditions, and comparison of laboratory interval velocities to those from the seismic reflection and drill depth records shows some discrepancies, suggesting that temperature-pressure corrections of up to +15% might be needed. In order to properly determine the in situ corrections needed will require future research of the porosity and velocity rebound characteristics, when in situ pressures are released, for a variety of sedimentary types with a wide variation in porosity and cementation. Velocities through Pleistocene through Oligocene chalk are typically 0 to 3% greater horizontally than vertically, while Eocene and older sedimentary rocks typically have 5% to 15% anisotropy. Velocity versus its corresponding impedance is an approximately linear relationship for a given mineral makeup, with an impedance error of ±0.5 × 10 g/(cm sec). Velocity versus porosity relationships are best enclosed by the Wyllie et al. (1956) equation and the Wood (1941) equation, while the Nafe and Drake (1957) equation requires values of n from 4 through 9 in order to fit all the data. INTRODUCTION Compressional sound velocity, wet-bulk density, wetwater content, porosity, and acoustic impedance were determined on sediments and rocks of Quaternary through Cretaceous age, which were recovered from 0 to 1000 meters below the sea floor from Deep Sea Drilling Project Sites 315-318. These sites are on the Line Islands chain (315 and 316), Manihiki Plateau (317), and the Tuamotu Ridge (318) in the Pacific Ocean (Figure 1, Table 1). These parameters are briefly defined here as follows. Sound velocity is the velocity of the compressional wave at 400 kHz through the sample, in units of km/sec. Wetbulk density is the ratio of "weight of the wet-saturated sample" to its "volume," expressed as g/cc. Wet-water content is the ratio of the "weight of sea water in the sample" to the "weight of the wet saturated sample," and is expressed as a percentage. Porosity is the ratio of the "pore volume in a sample" to the "volume of the wet saturated sample," and is also expressed as a percentage. Acoustic impedance is defined as the product of the velocity and wet-bulk density, and is expressed as (g 10)/(cm sec). All of the equations, derivations, and techniques are discussed in detail in ßoyce (this volume). Sound velocity parameters are important in interpreting seismic geophysical investigations. The wet-bulk density, wet-water content, and porosity determinations are important inasmuch as they are the framework for calculating other physical properties such as heat conductivity (Ratcliff, 1960; Bullard et al., 1956; Parasonis, 1960), sound velocity (Wood, 1941; Bullen, 1947; Wyllie, et al., 1956; Birch, 1960, 1961; Nafe and Drake, 1963; Christensen, 1965; Hamilton, 1971a), electrical resistivity (Archie, 1942, Winsauer et al., 1952; Boyce, 1968), sediment consolidation (Hamilton, 1959, 1964; Richards and Hamilton, 1967), and sedimentation rates, volumes, and masses. In addition, density is used in gravity survey models (Worzel and Harrison, 1963). The purpose of this paper will be to summarize the physical properties measured on Leg 33 in terms of (1) regional correlations, (2) interrelationships, (3) and seismic profile interpretations. These data are listed in the site reports of this volume. The detailed methods used to determine these parameters are discussed in detail by Boyce (this volume). The sediment classification used is discussed in the Explanatory Notes (this volume). However, the methods are briefly discussed below. In general, a compressional sound velocity sample, 2.5 to 5 cm thick, was cut and removed from a split core liner after waiting at least 4 hr after the core was on deck to allow it to reach room temperature. The sample was carefully smoothed with a sharp knife or file. Velocities

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Sound Velocity-Density Parameters of Sediment and Rock from DSDP Drill Sites 315318 on the Line Islands Chain, Manihiki Plateau, and Tuamotu Ridge in the Pacific Ocean

Sound Velocity-Density Parameters of Sediment and Rock from DSDP Drill Sites 315318 on the Line Islands Chain, Manihiki Plateau, and Tuamotu Ridge in the Pacific Ocean

Sound Velocity-Density Parameters of Sediment and Rock from DSDP Drill Sites 315318 on the Line Islands Chain, Manihiki Plateau, and Tuamotu Ridge in the Pacific Ocean