Near continuous density, magnetic susceptibility, and natural gamma radiation measurements were carried out with the MST on whole-round sections of cores from each hole (see "Explanatory Notes" chapter, this volume). Results from compressional (P-wave) ultrasonic velocity measurements with the MST were disregarded because of very high noise level (see "Physical Properties" section, "Site 1076" chapter, this volume).
Index properties (gravimetric density, porosity, and moisture content) were measured on one or two samples (volume = ~10 cm3) per working-half section on all cores from Hole 1080A, using Method C (see "Explanatory Notes" chapter, this volume).
Discrete ultrasonic compressional (P-wave) velocities and un-drained vane-shear measurements were conducted at a resolution of one or two samples per section close to the index properties samples. The modified Hamilton Frame was used for the discrete P-wave measurements.
The sampling interval for GRAPE density (Fig. 21) and magnetic susceptibility measurements (Fig. 22A) was 2 cm for the recovered core depth of 52 mbsf. MST data are included on CD-ROM (back pocket, this volume). Natural gamma radiation was measured with a sampling period of 30 s at 32-cm resolution (Fig. 22B). Profiles of magnetic susceptibility and natural gamma radiation correspond very well to each other (Fig. 22A and Fig. 22B, respectively). The correlation between GRAPE density and discrete wet bulk density data is good (Fig. 21), with slightly higher GRAPE values between 0 and 22 mbsf, and lower values below 25 mbsf. A sharp increase in density occurs at 10 mbsf.
The near-continuous velocity profile recorded with the MST was disregarded because of instrumental problems and high scatter caused by limited core quality. Discrete velocity values vary over a narrow range between 1540 and 1570 m/s (Fig. 23). Some similarities to the GRAPE and wet bulk density data are observed. High-quality discrete ultrasonic signals were recorded between 0 and 12 mbsf, but ended abruptly below 12 mbsf as a result of complete attenuation.
Results of discrete measurements of wet bulk density, porosity, and moisture content are presented in Fig. 24A, Fig. 24B, and Fig. 24C, respectively (also see Table 11 on CD-ROM, back pocket, this volume). The density values vary between 1250 and 1610 kg/m3. Porosity decreases from 82% in the top section to 62% at 52 mbsf (Fig. 24B), and moisture content varies between 68% and 40% from the top of Hole 1080A to 52 mbsf (Fig. 24C).
The thermal conductivity profile at Hole 1080A was determined in every second core section (see "Explanatory Notes" chapter, this volume). The values show a significant scatter and an overall decrease over the entire depth range (Fig. 22C). The thermal conductivity profile shows some positive correlation with porosity and un-drained vane-shear strength.
An undrained vane-shear measurement was performed in the bottom part of each core section. The profile shows a pronounced increase in shear strength at 10 mbsf (Fig. 22D). A local maximum can be observed at 14 mbsf, which is followed by an overall decrease in shear strength. Core breaks are indicated in Figure 22D. As at previous sites, higher values of shear strength are found primarily in the middle sections of each core, probably the result of compressional and decompressional effects within the core barrel.