An earthquake measuring 6.3 Mw struck near L'Aquila in the central Italian region of Abruzzo, killing 308 people and leaving more than 66,000 homeless.
2009 L'Aquila earthquake
An earthquake occurred in the region of Abruzzo, in central Italy, at 03:32 CEST on 6 April 2009. It was rated 5.8 or 5.9 on the Richter scale and 6.3 on the moment magnitude scale; its epicentre was near L'Aquila, the capital of Abruzzo, which together with surrounding villages suffered the most damage. There were several thousand foreshocks and aftershocks since December 2008, more than thirty of which had a Richter magnitude greater than 3.5.
Moment magnitude scale
The moment magnitude scale is a measure of an earthquake's magnitude based on its seismic moment. Mw was defined in a 1979 paper by Thomas C. Hanks and Hiroo Kanamori. Similar to the local magnitude/Richter scale (ML ) defined by Charles Francis Richter in 1935, it uses a logarithmic scale; small earthquakes have approximately the same magnitudes on both scales. Despite the difference, news media often use the term "Richter scale" when referring to the moment magnitude scale.
L'Aquila
L'Aquila is the capital city of the region of Abruzzo in central Italy. With 70,421 inhabitants as of 2025, it is also the second-largest city in the region. Laid out within medieval walls on a hill in the wide valley of the Aterno river, it is surrounded by the Apennine Mountains, with the Gran Sasso d'Italia to the north-east.
Abruzzo
Abruzzo, historically also known as Abruzzi, is a region of Southern Italy with an area of 10,763 square km and a population of 1.3 million. It is divided into four provinces: L'Aquila, Teramo, Pescara, and Chieti. Its western border lies 80 km (50 mi) east of Rome. Abruzzo borders the region of Marche to the north, Lazio to the west and northwest, Molise to the south and the Adriatic Sea to the east. Geographically, Abruzzo is divided into a mountainous area in the west, which includes the highest massifs of the Apennines, such as the Gran Sasso d'Italia and the Maiella, and a coastal area in the east with beaches on the Adriatic Sea.