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Table 1 Main Factors contributing to earthquake-triggered landslide events

From: A new classification of earthquake-induced landslide event sizes based on seismotectonic, topographic, climatic and geologic factors

  Inputs Assessment Weight
Intensity I M, D Arias Intensity AI computed according to Eqs. 1 and 2 AI > 1: I = \( \sqrt{AI} \)
IF AI ≤ 1: I = AI
Fault factor F Location, type and length of activated fault FLF: Location with respect to mountain range MR
FT: Fault type mechanism
FL: Fault length
a) Fault inside MR: FLF = 2
Near MR: FLF = 1.5; outside MR: FLF = 1
b) Dip-slip fault: FT = 1.5; Strike-slip: FT = 1
c) Fault length ≥ 100 km: FL = 2
Fault length between 20 and 100 km: FL = 1
Fault length < 20 km: FL = 0.5
F = FLF*FT*FL; Range F: 0.5-6
Topographic energy TE Google Earth analysis Maximum altitude difference Adif over 100 km2 tested for sample areas in affected zones. Adif > 1500 m : TE = 4
1000 < Adif ≤ 1500 m : TE = 3
500 < Adif ≤ 1000 m : TE = 2
Adif ≤ 500 m (but hilly): TE = 1
Flat with bluffs: TE = 0.5
Climatic background CB Climatic information extracted from any published sources Qualitative estimate considering
-antecedent rainfall AR
-general climatic conditions (CC: arid – wet climate)
Proved AR-yes
and/or CC wet: CB = 2
General conditions (or if not known): CB = 1
Arid climate: CB = 0.5
Very arid climate: CB = 0.2
Lithological factor LF Published geological information Qualitative estimate considering the presence of Quaternary (Q) or Tertiary (T) layers and bedrock Extensive cover of Q-layers: LF = 4
Wide presence of T-layers: LF = 2
Other cases or not known: LF = 1
  1. M magnitude (Mw or Ms as provided in publication), D hypocentral depth as provided