PSI - Issue 84

Nicola Perilli et al. / Procedia Structural Integrity 84 (2026) 805–812

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Susceptibility Class is determined by the upgrading SI using secondary parameters: Model reliability (or Reliability of Assessment) and Mitigation measures (Tabs. 1; Fig. 1). The term potential landslide and its associated primary parameter - criticality degree (P C ) - are not clearly defined and the procedure for assign the P C score is missing (Tab. 3). Regarding the secondary parameters Reliability of Assessment and Mitigation Works , both their definitions and the selection of available options are somewhat questionable.

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Figure 1. Logic flow for the determination of the Susceptibility (i.e., Suscettibilita of LLG 2020). The original Italian version is kept for clarity: Bassa (Low), Media (Medium), Alta (High), Limitata (Limited), Buona (Good), Qualsiasi (Any). Table 3 lists the available options for two secondary parameters, which, as shown in Figure 1, influence the determination of the Class of Susceptibility . Table 3. Secondary Parameters influencing the assessment of the Class of Susceptibility (LLG 2020). Model uncertainty or Reliability of the assessment = Affidabilita della valutazione ; Mitigation works = Misure di mitigazione Term Brief Definition Model Uncertainty (MU) • MU accounting for the level of knowledge of landslide; limited knowledge increases the susceptibility class. Options • Limited • Good Mitigation Works (MW) • MW considering their role on landslide risk reduction.

• The absence of MW automatically increases the susceptibility class. • The stabilized condition –cases where MW are implemented – reduces the susceptibility class. • The presence of monitoring does not affect the susceptibility class.

Options in the text

•Recognized phenomenon, not studied.

• Recognized phenomenon studied

Options in the Field Survey Form

• Modeled phenomenon under monitoring.

• Phenomenon subject to MW