Climate and hazards: seismic zone 1 and landslides on a tenth of the territory
In the seismic classification of the Civil Protection Department (updated May 2025) Isernia is in zone 1, the most hazardous. According to ISPRA IdroGEO about 11.5% of the municipal territory has high or very high landslide hazard. Temperatures, rainfall and PM10 exceedance days are in the data.
Sections: Seasons · Rainfall · Temperatures · Air quality · Environmental hazards
Seismic risk
The seismic classification file published by the Civil Protection Department (May 2025 update) places Isernia in zone 1. The Department describes zone 1 as the most hazardous, where the probability of a strong earthquake is high; special building rules apply in classified zones. The municipal page on the cathedral recalls the earthquakes of 1456, 1805 and 1984.
Landslides and floods
In the indicators of IdroGEO, ISPRA's platform on hydrogeological instability, areas of high and very high landslide hazard (P3 and P4) cover about 7.9 km², 11.5% of the municipal area, and about 1,500 people live in them (7.2% of the population). Areas of medium flood hazard (P2) are about 2% of the territory, with about 160 residents.
Missing: temp_jan_avg, temp_jul_avg, rain_days_year, air_pm10_days_over_limit
Sources
Updated: 2026-10-22
Updated: 2026-10-22
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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