M5.1 Earthquake 7 km SE of Marradi, Italy — September 18, 2023
2023-09-18 03:10:14 UTC (2023-09-18) · approx. 4:10 AM UTC+1 local
Felt by 67 people across nearby locations.
On September 18, 2023 at 03:10 UTC, a magnitude 5.1 shallow crustal earthquake struck 7 km SE of Marradi, Italy, at a depth of 10.0 km and coordinates 44.0201°, 11.6768°. This earthquake was detected by 110 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 441, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.1 releases seismic energy equivalent to roughly 674 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.0 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Italy, a region characterized by the Apennine extensional belt and Calabrian subduction zone, where Africa-Eurasia convergence produces complex faulting. View all earthquakes in Italy.
Learn more: Magnitude scale · Aftershock sequences
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 67 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
11.6768°E
Technical Information
Common Questions
How strong was the magnitude 5.1 earthquake near Marradi, Italy?
The magnitude 5.1 earthquake that struck 7 km SE of Marradi, Italy on September 18, 2023 at 03:10 UTC had a depth of 10.0 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 44.0201°, 11.6768°, which is 7 km SE of Marradi, Italy. View all earthquakes in Italy.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.1 earthquakes can continue for days to weeks and gradually diminish over time.
Has Italy had earthquakes this big before?
The largest recorded earthquake in Italy was the M7.2 Messina earthquake of December 28, 1908. Today's magnitude 5.1 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us7000kwdw). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 18, 2023). M5.1 Earthquake 7 km SE of Marradi, Italy — September 18, 2023. Retrieved December 2, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kwdw/