Table 5 Parameters used in coseismic landslide susceptibility assessment
From: Coseismic landslide susceptibility assessment using geographic information system
Parameters | Classes | Susceptibility | Score |
|---|---|---|---|
Relief (m/km2) (Sr) | 0–75 | Very Low | 0 |
76–175 | Low | 1 | |
176–300 | Moderate | 2 | |
301–500 | Medium | 3 | |
501–800 | High | 4 | |
>800 | Very High | 5 | |
Lithology (Sl) | Permeable limestone, slightly fissured intrusions, basalt, andesite, granites, ignimbrite, gneiss, hornfels, low degree of weathering. Low water table, clean regose fractures, high shear strength rocks. | Low | 1 |
High degree of weathering of above mentioned lithologies and of hard massive clastic sedimentary rocks, low shear strength, shareable fractures | Moderate | 2 | |
Considerably weathered sedimentary, intrusive, metamorphic, volcanic rocks, compacted sandy regolithic soils, considerable fracturing, fluctuating water tables, compacted colluvium and alluvium | Medium | 3 | |
Considerably weathered, hydrothermally altered rocks of any kind, strongly fractured and fissured, clay filled, poorly compacted pyroclastic and fluvio-lacustrine soils, shallow water table. | High | 4 | |
Extremely altered rocks, low shear resistance alluvial, colluvial and residual soils, shallow water tables. | Very high | 5 | |
Annual Precipitation (natural humidity index of soil) (Sh) | summation of average monthly rainfall | ||
0–4 | Very Low | 1 | |
5–9 | Low | 2 | |
10–14 | Medium | 3 | |
15–19 | High | 4 | |
20–24 | Very high | 5 | |
Intensities (MM) (Ts) | III | Slight | 1 |
IV | Very low | 2 | |
V | Low | 3 | |
VI | Moderate | 4 | |
VII | Medium | 5 | |
VIII | Considerable | 6 | |
IX | Important | 7 | |
X | Strong | 8 | |
XI | Very Strong | 9 | |
XII | Extremely Strong | 10 | |
Influence of rainfall intensity as a triggering factor for landslide (rainfall n < 10 Years; average (mm) (Tp) | <50 | Very low | 1 |
51–90 | Low | 2 | |
91–130 | Medium | 3 | |
131–175 | High | 4 | |
>175 | Very High | 5 | |