Initial Reports Volume 191
Chapter 4, Table 18. Correlation of reflection traveltime with the lithostratigraphic column using measured P-wave velocities, Site 1179. 

Notes: * = Measured velocities have been corrected for in situ temperature at top and bottom of each lithostratigraphic unit: dV/dT = 3.2 m/s/degC. PWL = P-wave logger. Data from seismic profile line 2-1, Hakuho Maru, August 1996. ? = no correlation. 

Observed traveltime (s)	Estimated traveltime (s)	Depth (mbsf)	Corrected* velocity (m/s)	Interval velocity (m/s)	Reflection strength	Correlation

0		0	1470		Strong	Seafloor
0.018				1579	Weak	?
0.038	0.040	60	1486		Weak	Small perturbation in PWL velocity at 60 mbsf
				1622		
0.075	0.080	120	1502		Weak	Very slight increase in velocity at 120 mbsf
				1400		
0.100	0.105	155	1512		Weak	Slight increase in density at 155 mbsf
				2000		
0.115	0.125	185	1520		Weak	Increases in velocity and density at 185 mbsf
0.132				1027	Weak	?
			1530			
0.152	0.149	223			Weak	Unit I/Unit II: increase in density at 215-225 mbsf
			1540			
				2400		
			1546			
0.162	0.165	247			Weak	Unit II/Unit III: abrupt change in velocity and density at 245 mbsf
			1556			
0.172					Strong	?
			1566			 
?	0.188	283			Strong	Unit III/Unit IV: top of chert
0.220					Strong	?
						
0.250		275			Moderate	Unit IV/Unit V: top of basement