Table 3. Descriptive statistics of soil and geological characteristics from the study sites.

Properties	Slow-moving landslide prone area			Control area
	Mean	S.D.	Range	Mean	S.D.	Range
Ratio of soil particle less than 0.075 mm	35.0	17.8	13.2-86.5	31.4	18.1	9.4-85.1
Ratio of soil particle less than 0.002 mm	12.5	8.2	2.7-42.4	13.1	7.9	2.4-39.5
Wet unit weight (kN/m3)	17.21	1.07	14.60-19.07	17.65	1.12	14.40-19.80
Void ratio	0.808	0.140	0.548-1.205	0.785	0.106	0.601-1.049
Permeability (cm/s)	4.0×10−5	7.1×10−5	1.1×10−6−3.8×10−4	1.6×10−4	6.3×10−4	7.7×10−7−3.9×10−3
Cohesion (kPa)	9.2	4.0	4.1-18.0	8.2	3.9	4.0-18.3
Internal friction angle (°)	26.9	3.7	18.0-34.1	29.5	4.7	17.0-39.0
Soil layer thickness (m)	3.35	1.89	0.4-10.5	3.45	2.90	0.1-15.8
Weathered rock layer thickness (m)	3.45	2.35	0.5-15.0	7.79	5.66	1.0-32.0
Bed rock layer thickness (m)	6.67	3.48	1.3-21.0	14.15	9.62	0.5-46.0
Number of major anomaly zones	1.18	0.64	0-3	1.00	0.86	0-3