Earthquakes today in Roisan
Today, within 30 km: no earthquakes recorded (updated at 13:14). Latest: M0.9 on 12 October 2026 at 18:49, 6 km East of Courmayeur, 11 km deep.
Seismic activity within 30 km
30 km radiusINGV catalogue epicentres of the last ~12 years, within the given radius from the town centre.
How seismic is Roisan: zone 3
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 = 0.102 g (10% probability of exceedance in 50 years, rigid soil).
“Within 30 km”: epicentres less than 30 km from the centre of Roisan. “In the town”: quakes whose nearest town to the epicentre is Roisan.
The seismic history of Roisan
The earthquakes that were actually felt in Roisan over the centuries, with the intensity observed on site (Mercalli MCS scale).
- 2005IV8 September 2005
Moderate: felt by many indoors; glasses and dishes rattle.
Massif du Mont-Blanc earthquake (M4.4), epicentre 44 km away
- 1996III-IV31 March 1996
Moderate: felt by many indoors; glasses and dishes rattle.
Valle d'Aosta earthquake (M4.2), epicentre 20 km away
- 1887NF23 February 1887
Imperceptible: only instruments record it.
Liguria occidentale earthquake (M6.3), epicentre 217 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 32 km from Chamonix, 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).
Over time within 30 km
Earthquake map within 30 km
60 eventsLatest earthquakes within 30 km
Nearby towns
How does it compare with the surroundings?
Roisan is about average for its province in recorded quakes.
Each quake is attributed to the town closest to its epicentre: the numbers describe the area, not the municipal territory alone.
Context
Province of Aosta39 events · last 30 daysAosta Valley region39 events · last 30 daysFrequently asked questions
Were there earthquakes near Roisan today?
No, no quakes were recorded today within 30 km of Roisan. The latest dates back to 12 October 2026.
Is Roisan a seismic area?
Roisan 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 Roisan?
In the INGV catalogue since 2015, the strongest earthquake within 30 km of Roisan was magnitude 3.9, on 5 October 2021.
When was the last quake near Roisan?
The last quake recorded within 30 km of Roisan dates back to 12 October 2026, magnitude 0.9.
Tip. Click a nearby town to explore its seismicity.
Sources:INGV earthquake catalogueDBMI15 macroseismic historyCivil Protection seismic classification
Data: INGV — National Institute of Geophysics and Volcanology (CC-BY 4.0)