Earthquakes in Grondona
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 = 0.096 g (10% probability of exceedance in 50 years, rigid soil).
The “area” is Grondona plus nearby towns.
The seismic history of Grondona
The earthquakes that were actually felt in Grondona over the centuries, with the intensity observed on site (Mercalli MCS scale).
- 2005NF18 April 2005
Imperceptible: only instruments record it.
Valle del Trebbia earthquake (M4.0), epicentre 29 km away
- 2005NF13 April 2005
Imperceptible: only instruments record it.
Valle del Trebbia earthquake (M3.7), epicentre 27 km away
- 2002NF13 November 2002
Imperceptible: only instruments record it.
Franciacorta earthquake (M4.2), epicentre 140 km away
- 2000NF21 August 2000
Imperceptible: only instruments record it.
Monferrato earthquake (M4.9), epicentre 53 km away
- 1828VII-VIII9 October 1828
Ruinous: partial collapses in ordinary buildings, widespread heavy damage.
Oltrepò Pavese earthquake (M5.7), epicentre 15 km away
- 1828VII-VIII9 October 1828
Ruinous: partial collapses in ordinary buildings, widespread heavy damage.
Oltrepò Pavese earthquake (M5.7), epicentre 15 km away · observed at Variana
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 20 km from Rivanazzano-Stradella, 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
33 eventsEarthquakes in the area
Nearby towns
How does it compare with the surroundings?
Grondona records more quakes than the average of its province.
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 Grondona?
No, no quakes were recorded today in the Grondona area: the latest nearby dates back to 14 months ago.
Is Grondona a seismic area?
Grondona 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 Grondona?
In the last ~12 years of INGV data, the strongest within 30 km of Grondona was magnitude 3.1, in 2020.
When was the last quake near Grondona?
The last quake recorded within 30 km of Grondona 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)