(Table 1) Bulk and grain density, porosity, and p- and s-wave velocity characteristics of ODP Hole 163-990A sediments ...

• Main Authors: Cerney, Brian, Carlson, Richard L
• Format: Dataset
• Language: English
• Published: PANGAEA 1999
• Subjects: Sample code/label; Density, wet bulk; Density, grain; Porosity; Pressure, stress; Velocity, compressional wave; Velocity, shear wave; Drilling/drill rig; DSDP/ODP/IODP sample designation; Calculated from mass/volume; Leg163; Joides Resolution; Ocean Drilling Program ODP; Greenland
• Online Access: https://dx.doi.org/10.1594/pangaea.804640; https://doi.pangaea.de/10.1594/PANGAEA.804640

Seismic velocities in rocks are influenced by the properties of the solid, the pore fluid, and the pore space. Cracks dramatically affect seismic velocities in rocks; their influence on the effective elastic moduli of rocks depends on their shape and concentration. Thin cracks (or fractures) substantially lower the moduli of a rock relative to the effect of spherical voids (or vesicles), and lower moduli are reflected by lower P- and S-wave velocities. The objective of this research is to determine the types and concentrations of cracks and their influence on the seismic properties of subaerially erupted basalts drilled from Hole 990A on the Southeast Greenland margin during Ocean Drilling Program Leg 163. Ellipsoidal cracks are used to model the voids in the rocks. The elastic moduli of the solid (grains) are also free parameters in the inverse modeling procedure. The apparent grain moduli reflect a weighted average of the moduli of the constituent minerals (e.g., plagioclase, augite, and clay minerals). ... : Supplement to: Cerney, Brian; Carlson, Richard L (1999): The effect of cracks on the seismic velocities of basalt from Site 990, Southeast Greenland margin. In: Larsen, HC; Duncan, RA; Allan, JF; Brooks, K (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 163, 1-7 ...