Coseismic deformation of the destructive April 6, 2009 L'Aquila earthquake (central Italy) from GPS data

Details Coseismic deformation of the destructive April 6, 2009 L'Aquila earthquake (central Italy) from GPS data Coseismic deformation of the destructive April 6, 2009 L'Aquila earthquake (central Italy) from GPS data

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3617307a&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 17, CiteID L17307

Physics

19

Geodesy And Gravity: Seismic Cycle Related Deformations (6924, 7209, 7223, 7230), Geodesy And Gravity: Tectonic Deformation (6924), Seismology: General Or Miscellaneous, Tectonophysics: General Or Miscellaneous

Scientific paper

On April 6, 2009, 01:32:39 GMT, the city of L'Aquila was struck by a Mw 6.3 earthquake that killed 307 people, causing severe destruction and ground cracks in a wide area around the epicenter. Four days before the main shock we augmented the existing permanent GPS network with five GPS stations of the Central Apennine Geodetic Network (CaGeoNet) bordering the L'Aquila basin. The maximum horizontal and vertical coseismic surface displacements detected at these stations was 10.39 ± 0.45 cm and -15.64 ± 1.55 cm, respectively. Fixing the strike direction according to focal mechanism estimates, we estimated the source geometry with a non linear inversion of the geodetic data. Our best fitting fault model is a 13 × 15.7 km2 rectangular fault, SW-dipping at 55.3 ± 1.8°, consistent with the position of observed surface ruptures. The estimated slip (495 ± 29 mm) corresponds to a 6.3 moment magnitude, in excellent agreement with seismological data.

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