Earthquakes in Isola del Giglio
Seismic activity in the surroundings
50 km radiusNo events within 30 km of the town. The closest on record: magnitude 1.4, 31 km away.
INGV catalogue epicentres of the last ~11 years, within the given radius from the town centre.
How seismic is this area?
The quietest class: the probability of strong earthquakes is very low.
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 = 0.035 g (10% probability of exceedance in 50 years, rigid soil).
Why the ground rarely shakes here
Isola del Giglio sits in one of the most stable areas of Italy: far from the boundary between the Eurasian and African plates, on ancient, rigid crust that hardly accumulates tectonic stress any more.
That is why earthquakes here are rare and almost always weak: a small geological privilege.
The “area” is Isola del Giglio plus nearby towns.
The seismic history of Isola del Giglio
The earthquakes that were actually felt in Isola del Giglio over the centuries, with the intensity observed on site (Mercalli MCS scale).
- 1987NF22 January 1987
Imperceptible: only instruments record it.
Costa pisano-livornese earthquake (M4.2), epicentre 149 km away · observed at Isola del Giglio (Castello)
- 1984NF29 April 1984
Imperceptible: only instruments record it.
Umbria settentrionale earthquake (M5.6), epicentre 165 km away · observed at Isola del Giglio (Castello)
- 1980NF23 November 1980
Imperceptible: only instruments record it.
Irpinia-Basilicata earthquake (M6.8), epicentre 396 km away · observed at Isola del Giglio (Castello)
- 1980IV8 September 1980
Moderate: felt by many indoors; glasses and dishes rattle.
Costa Grossetana earthquake (M4.4), epicentre 35 km away · observed at Isola del Giglio (Castello)
- 1980IV8 September 1980
Moderate: felt by many indoors; glasses and dishes rattle.
Costa Grossetana earthquake (M4.4), epicentre 35 km away · observed at Isola di Giannutri
- 1948NF13 June 1948
Imperceptible: only instruments record it.
Alta Valtiberina earthquake (M5.0), epicentre 170 km away · observed at Isola del Giglio (Castello)
- 1919NF22 October 1919
Imperceptible: only instruments record it.
Anzio earthquake (M5.2), epicentre 164 km away · observed at Isola del Giglio (Castello)
- 1909IV25 August 1909
Moderate: felt by many indoors; glasses and dishes rattle.
Crete Senesi earthquake (M5.3), epicentre 98 km away · observed at Isola del Giglio (Castello)
- 1905NF12 February 1905
Imperceptible: only instruments record it.
Monte Amiata earthquake (M4.5), epicentre 77 km away · observed at Isola del Giglio (Castello)
- 1887II23 February 1887
Very light: felt only by a few people at rest, on upper floors.
Liguria occidentale earthquake (M6.3), epicentre 297 km away · observed at Isola del Giglio (Castello)
- 1846F14 August 1846
Moderate: felt by many indoors; glasses and dishes rattle.
Colline Pisane earthquake (M6.0), epicentre 131 km away · observed at Isola del Giglio (Castello)
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 129 km from Livorno Hills, 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?
Isola del Giglio 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 Grosseto9 events · 30gTuscany region53 events · 30gFrequently asked questions
Were there earthquakes today in Isola del Giglio?
No, no quakes were recorded today in the Isola del Giglio area: the latest nearby dates back to 5 months ago.
Is Isola del Giglio a seismic area?
Isola del Giglio is classified in seismic zone 4 by the Civil Protection. The quietest class: the probability of strong earthquakes is very low.
What was the strongest earthquake near Isola del Giglio?
In the last ~11 years of INGV data, the strongest within 50 km of Isola del Giglio was magnitude 2.4, in 2016.
When was the last quake near Isola del Giglio?
The last quake recorded within 50 km of Isola del Giglio was 61 months ago.
Tip. Click a nearby town to explore its seismicity.
Data: INGV — National Institute of Geophysics and Volcanology (CC-BY 4.0)