Table 7 Matrix used to assess the systemic vulnerability of roads, harbours and heliports on Vulcano (adapted from Guobadia 2017). L, M and H indicate low, medium and high (Qualitative assessment). Numbers used for a quantitative vulnerability assessment are also indicated in the 5th column

ROADS

Transferability

Possibility that one function or service can be relocated in another place in case of need

High possibility (L)

Medium possibility (M)

Low possibility (H)

1(L), 2(M), 3(H)

Redundancy

Existence of other assets with the same function

Availability of other assets (L)

Partial availability (M)

No availability of other assets (H)

1(L), 2(M), 3(H)

External interdependency (among lifelines)

Existence of functionality links among lifelines

High (H)

Medium (M)

Low (L)

intra-system interdependency

1(L), 2(M), 3(H)

HARBOURS

Transferability

Other assets with the same function

Good (L)

Medium (M)

No availability of other assets (H)

1(L), 2(M), 3(H)

Accessibility

Possibility to use/access the asset

low (H)

Medium (M)

Good accessibility to the assets (L)

1(L), 2(M), 3(H)

External interdependency

Different systems linked functionally to each other

low (L), medium (M), high dependency (H) on other assets

1(L), 2(M), 3(H)

HELIPORTS

Transferability

Other assets with the same function

Good (L)

Medium (M)

No availability of other assets (H)

1(L), 2(M), 3(H)

Accessibility

Possibility to use/access the asset

Low (H)

Medium (M)

Good accessibility to the assets (L)

1(L), 2(M), 3(H)

External interdependency

Different systems linked functionally to each other

low (L), medium (M), high dependency (H) on other assets

1(L), 2(M), 3(H)