L’Aquila, Earthquake, Capoluogo d’Abruzzo, Terremoto, Perdonanza, Porta Santa, Celestino V, Federico II, Giubileo, G8 L’Aquila 2009

Earthquakes locations (last update 7 PM, September 24th 2009)

On April 6 th 2009 an earthquake (Ml=5.8; Mw= 6.2) occurred at 03:33 a.m. ( local time) near L’Aquila as a result of normal faulting on a NW-SE oriented structure about 15 km long. The fault dips toward SW and the town of L’Aquila lies on the hanging wall. The seismic sequence includes hundreds of events located in real time by the seismologists at INGV monitoring room, using data from both the National seismic network and from the satellite emergency network installed in the epicentral area.

During  the days following the main event the Italian National Seismic Network located several hundreds of aftershocks (Figure1). Three large aftershocks  (Ml 4.8, 4.7 and 5.3) occurred on April 7th  near L’Aquila and south-east of the town ( close to Onna, Fossa, Ocre villages). None of the aftershocks of  April 8th was larger than Ml 4. On April 9th a Ml  5.1 was located to the north of  L’Aquila, close to Barete, Pizzoli, Campotosto. We had more than 30 aftershocks 3.5<Ml< 5., and several thousands events of lower magnitude.

The area interested by seismicity is about 30 km long and strikes in the NW-SE direction, parallel to the Apennine mountain axis and to the main fault structures known in the area.
The seismicity is confined in the upper crust: the northern events are located above 12 km depth, while the southernmost Ml 5.3 aftershock occurred at 15 km depth.
The mainshock occurred on a fault about 15 km long having a NW-SE strike and a SW dip.

UPDATED INFORMATION about the sequence – June 27, 2009

LOCATION of April 6, 2009 earthquake updated with all the available data

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