Climate and risks: seismic zone 2 and landslide hazard on about 2% of the territory
In the seismic classification published by the Civil Protection Department, Viterbo is in zone 2 (sub-zone 2B). ISPRA's IdroGEO platform shows no flood-hazard areas in the municipality; high and very high landslide-hazard areas cover about 2% of the territory, with 501 residents exposed.
Sections: Seasons · Rainfall · Temperatures · Air quality · Environmental hazards
Seismic risk
The table of municipal seismic classification published by the Civil Protection Department (updated to May 2025) gives Viterbo the value «2B»: zone 2, in sub-zone B of the Lazio Region's classification. According to the Department, in zone 2 strong earthquakes are possible; zone 1 is the most hazardous, zone 4 the least.
Landslides and floods
Out of a municipal area of 406.2 km², the IdroGEO sheet, based on the ISPRA 2024 Report on hydrogeological instability, shows 7.9 km² (2.0%) of high and very high landslide-hazard areas (P3 and P4), where 501 residents (0.8%) live and 295 buildings stand. The ISPRA mosaic shows no flood-hazard areas in the municipal territory: according to this source no resident is exposed to flood risk. The platform also publishes the map of these areas.
Missing: rain_days_year
Data
Sources
Updated: 2026-10-22
Updated: 2026-10-22
Reviewed: 10/23/2026 · by piero.avolio · rev. 1 · Period: → 2027-10-31
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