Application of Geophysical Techniques for 3D Geohazard Mapping to Delineate Cavities and Potential Sinkholes in the Northern Part of Kuala Lumpur, Malaysia

Table 3

Classification use for the description of rock mass/material in the study area.

Porosity %	Resistivity Ω·m	Explanation	Description of samples for Batu Cave	Description	Pictures of samples
26–50	25–50	Residual (RS)	Humid soil	Soil
16–26	50–80	Completely weathered (CW)	Alluvium	Soil and rock
14–16	80–180	Highly weathered (HW)	Highly weathered limestone	Red colour
10–14	180–300	Moderately weathered (MW)	Moderatel weathered limestone	Cream colour
6–10	300–380	Slightly weathered (SW)	Slightly weathered limestone	White and grey
4–6	380–500	Unweathered	Fresh limestone	White colour