Earthquakes in Castelletto d'Orba
Seismic activity in the surroundings
30 km radiusINGV catalogue epicentres of the last ~12 years, within the given radius from the town centre.
How seismic is this area?
Medium-low seismicity: strong quakes are rare, but not impossible.
Official Civil Protection classification (upd. 2025), used for building codes.
Hazard describes the long-term expected shaking: it is not a forecast. Technical value: ag = 0.082 g (10% probability of exceedance in 50 years, rigid soil).
The “area” is Castelletto d'Orba plus nearby towns.
The seismic history of Castelletto d'Orba
The earthquakes that were actually felt in Castelletto d'Orba over the centuries, with the intensity observed on site (Mercalli MCS scale).
- 1906NF14 July 1906
Imperceptible: only instruments record it.
Valle Scrivia earthquake (M4.2), epicentre 14 km away
- 1891V28 May 1891
Rather strong: felt by almost everyone; hanging objects swing.
Alessandrino earthquake (M4.1), epicentre 5 km away
Source: Italian Macroseismic Database DBMI15 (INGV, CC BY 4.0).
The great earthquakes in this area's history
Almost a thousand years of catalogues: the strongest documented events within ~50 km.
Source: Parametric Catalogue of Italian Earthquakes CPTI15 (INGV, CC BY 4.0).
The closest seismic structure
The town lies about 24 km from Eastern Monferrato, one of the seismic structures mapped by INGV geologists.
Faults are mapped to build better and understand the territory: knowing them says nothing about when an earthquake will occur, which remains unpredictable. Source: DISS 3.3 (INGV, CC BY 4.0).
Area over time
Earthquake map
20 eventsEarthquakes in the area
Nearby towns
How does it compare with the surroundings?
Castelletto d'Orba is among the quietest towns of its province: very few epicentres are recorded here.
Each quake is attributed to the town closest to its epicentre: the numbers describe the area, not the municipal territory alone.
Context
Province of Alessandria0 events · 30gPiedmont region34 events · 30gFrequently asked questions
Were there earthquakes today in Castelletto d'Orba?
No, no quakes were recorded today in the Castelletto d'Orba area: the latest nearby dates back to 24 months ago.
Is Castelletto d'Orba a seismic area?
Castelletto d'Orba is classified in seismic zone 3 by the Civil Protection. Medium-low seismicity: strong quakes are rare, but not impossible.
What was the strongest earthquake near Castelletto d'Orba?
In the last ~12 years of INGV data, the strongest within 30 km of Castelletto d'Orba was magnitude 3.1, in 2020.
When was the last quake near Castelletto d'Orba?
The last quake recorded within 30 km of Castelletto d'Orba was 11 days ago.
Tip. Click a nearby town to explore its seismicity.
Data: INGV — National Institute of Geophysics and Volcanology (CC-BY 4.0)