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Document ActionsThe L'Aquila seismic sequence - April 2009Updated September 24,2009 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, 2009LOCATION of April 6, 2009 earthquake updated with all the available data
Focal Mechanisms Shake Maps GPS preliminary results SAR preliminary results Macroseismic maps from "Did you feel the earthquake?" Report on the coseismic effects on the natural environment (by EMERGEO) in Italian Preliminary Report on the earthquake effects (by QUEST) Italian Parametric Earthquake Catalogue-CPTI08aq (L'Aquila area only, April 2009) Strong-motion parameters of the Mw=6.3 Abruzzo (Central Italy) earthquake NOTE: Information and data contained in this site are provided by the staff of Istituto Nazionale di Geofisica e Vulcanologia. Except where otherwise indicated, all materials are: |
