Earthquakes in Semproniano
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 = 0.139 g (10% probability of exceedance in 50 years, rigid soil).
The “area” is Semproniano plus nearby towns.
The seismic history of Semproniano
The earthquakes that were actually felt in Semproniano over the centuries, with the intensity observed on site (Mercalli MCS scale).
- 2000IV1 April 2000
Moderate: felt by many indoors; glasses and dishes rattle.
Monte Amiata earthquake (M4.5), epicentre 17 km away
- 1997NF14 October 1997
Imperceptible: only instruments record it.
Valnerina earthquake (M5.6), epicentre 112 km away
- 1997NF26 September 1997
Imperceptible: only instruments record it.
Appennino umbro-marchigiano earthquake (M5.7), epicentre 114 km away
- 1984NF29 April 1984
Imperceptible: only instruments record it.
Umbria settentrionale earthquake (M5.6), epicentre 100 km away
- 1940V-VI16 October 1940
Strong: felt by everyone, many get scared; objects fall, first light damage to buildings.
Val di Paglia earthquake (M5.3), epicentre 32 km away · observed at Cellena
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 84 km from Mugello-Citta' di Castello-Leonessa, 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
60 eventsEarthquakes in the area
Nearby towns
How does it compare with the surroundings?
Semproniano 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 Grosseto1 events · 30gTuscany region112 events · 30gFrequently asked questions
Were there earthquakes today in Semproniano?
No, no quakes were recorded today in the Semproniano area: the latest nearby dates back to 16 days ago.
Is Semproniano a seismic area?
Semproniano 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 Semproniano?
In the last ~12 years of INGV data, the strongest within 30 km of Semproniano was magnitude 3.4, in 2016.
When was the last quake near Semproniano?
The last quake recorded within 30 km of Semproniano was 16 days ago.
Tip. Click a nearby town to explore its seismicity.
Data: INGV — National Institute of Geophysics and Volcanology (CC-BY 4.0)