 Photo of the partially collapsed ceiling vault of the Basilica of Saint Francis of Assisi after the earthquake | |
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| UTC time | 1997-09-26 09:40:26 |
|---|---|
| ISC event | 1043512 |
| USGS-ANSS | ComCat |
| Local date | 26 September 1997 |
| Local time | 11:40 |
| Magnitude | 6.0 Mw |
| Depth | 10 km (6.2 mi) |
| Epicenter | 43°05′02″N 12°48′43″E / 43.084°N 12.812°E |
| Areas affected | Italy (Umbria, Marche) |
| Max. intensity | MMI X (Extreme)[1] |
| Casualties | 11 dead 100 injured |
The 1997 Umbria and Marche earthquake occurred in the regions of Umbria and Marche, central Italy on the morning of 26 September. It was preceded by a foreshock almost as strong as the main quake. The foreshock occurred at 02:33 CEST (00:33 UTC), rated Mw5.7, and the second – the main shock – occurred at 11:40 CEST (09:40 UTC), rated Mw 6.0. Their epicentre was in Annifo. The mainshock was assigned X (Extreme) and foreshock VIII (Severe) on the Mercalli intensity scale.[2]
There were several thousands of foreshocks and aftershocks from May 1997 to April 1998, more than thirty of which had a magnitude more than 3.5. Eleven people are known to have died following the shocks.
- ^ "M 6.0 – 3 km SSE of Nocera Umbra, Italy". United States Geological Survey. Retrieved 3 July 2021.
- ^ "M 5.7 – 6 km WSW of Serravalle di Chienti, Italy". United States Geological Survey. Retrieved 3 July 2021.