Table 7. Sample intervals, depths of investigation, and vertical resolutions of the logging tools deployed during Leg 175.

Tool string

Tool

Measurement

Sample
interval
(cm)

Depth of
investigation
(cm)

Approximate
vertical resolution
(cm)

Seismostratigraphy

NGT

Natural gamma
15
 Variable
45

SDT Sonic velocity
15
 10-60
120

DIT Resistivity
2.5 or 15
 38/76/150
59/150/200
Lithodensity HNGS Natural gamma
15
 Variable
45

APS Porosity
5 or 15
 15
15-30

LDS Bulk density, PEF
2.5 or 15
 15-60
15-45
FMS NGT Natural gamma
15
 Variable
45

FMS Resistivity image
0.25
 5-25
<1
GHMT NRMT Total magnetic field
5
 Variable
15-30

SUMT Magnetic susceptibility
5
 Variable
15-30

Notes: The vertical resolution is the minimum depth interval for which a representative log measurement can be obtained. See text for explanations of the acronyms.