Table 2b. Abyssal plain and abyssal hill environments; sediment densities, 

 porosities, sound velocities and velocity ratios. 





Density, 



Porosity, 



Velocity 









Environment 



g/cm 



i 



% 





m/sec 





Velocity 



Avg. 



Ratio 



Sediment Type 



Avg. 



SE 



Avg. 



SE 



Avg. 



SE 



SE 



Abyssal Plain 



















Sandy silt 



1.652 



- 



56.6 



- 



1622 



- 



1.061 



- 



Silt 



1.604 



- 



63.6 



- 



1563 



- 



1.022 



- 



Sand-sOt-clay 



1.564 



- 



66.9 



- 



1536 



- 



1.004 



- 



Clayey silt 



1.437 



0.023 



75.2 



1.31 



1526 



3 



0.998 



0.002 



Silty clay 



1.333 



0.019 



81.4 



1.03 



1515 



2 



0.991 



0.001 



Clay 



1.352 



0.037 



80.0 



2.20 



1503 



•7 



0.983 



0.001 



Bering Sea and Okhotsk Sea (Diatomaceous) 













Silt 



1.447 



- 



70.8 



- 



1546 



- 



1.011 



- 



Clayey silt 



1.228 



0.019 



85.8 



0.86 



1534 



2 



1.003 



0.001 



Silty clay 



1.214 



0.008 



86.8 



0.43 



1525 



2 



0.997 



0.001 



Abyssal HiU 



















Deep-sea ("red' 



') pelagic clay 

















Clayey silt 



1.347 



0.020 



81.3 



0.95 



1522 



3 



0.995 



0.002 



Silty clay 



1.344 



0.011 



81.2 



0.60 



1508 



2 



0.986 



0.001 



Clay 



1.414 



0.012 



77.7 



0.64 



1493 



1 



0.976 



0.001 



Calcareous ooze 



















Sand-silt-clay 



1.400 



0.013 



76.3 



0.90 



1581 



8 



1.034 



0.005 



Silt 



1.725 



- 



56.2 



- 



1565 



- 



1.023 



- 



Clayey silt 



1.573 



0.020 



66.8 



1.22 



1537 



5 



1.005 



0.003 



Silty clay 



1.483 



0.029 



72.3 



1.61 



1524 



7 



0.996 



0.005 



Notes: Laboratory values: 23°C, 1 atm; density: saturated bulk density; porosity: salt free ; velocity 

 ratio: velocity in sediment/velocity in sea water at 23°C, 1 atm, and saUnity of sediment pore 

 water. SE: standard error of the mean. 



28 



