Table 2 Scoring and classification of all parameters used in the RHZ model

From: GIS-based rockfall hazard zones modeling along the coastal Gulf of Aqaba Region, Egypt

Factor Parameter Attribute Raw Score (Rj) Normalized Score (Xj) Relative value
Topography Slope
(Arnous 2011)
<15 1 0 Very low
15-25 2 25 Low
25-35 3 50 Moderate
35-45 4 75 High
>45 5 100 Very high
Aspect
(Arnous 2011)
N, flat 1 0 Very low
SW & W 2 25 Low
SE, S & NW 3 50 Moderate
NE & E 5 100 Very high
Elevation
(Arnous 2011)
<500 1 0 Very low
500-1000 2 25 Low
1000-1500 3 50 Moderate
1500-2000 4 75 High
>2000 5 100 Very high
Geology Lithology
(Arnous 2011
Saroglou 2019)
Silt and clay (Sabkha deposits) 1 0 Very low
Sediment (Wadi deposits) and metasediment 2 25 Low
Sandstone 3 50 Moderate
Igneous rock (Basalt), Limestone 4 75 High
Metamorphic rocks (Gniess, marbel, metadiorite, metavolcanic and metagabbro); Igneous rock (Granites, Gabbro , Diorite) 5 100 Very high
Lineament density <0.00077 1 0 Very low
0.00077-0.0015 2 25 Low
0.0015-0.0023 3 50 Moderate
0.0023-0.0031 4 75 High
>0.0031 5 100 Very high
Climate Rainfall intensity <0.13 1 0 Very low
0.13-0.15 2 25 Low
0.15-0.17 3 50 Moderate
0.17-0.19 4 75 High
0.19-0.22 5 100 Very high
Seismic activity Seismic Magnitude
(Saroglou 2019)
<0 1 0 Very low
1-3 3 50 Moderate
3-5 5 100 Very high
Seismic Depth
(Saroglou 2019)
0-20 5 100 Vey high
20-30 3 50 Moderate
30-40 1 0 Very low