Abstract
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 x 15.7 km2 rectangular fault,
SW-dipping at 55.3 +- 1.8 deg, 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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