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Authors: Stewart, J. P.* 
Lanzo, G.* 
Pagliaroli, A.* 
Scasserra, G.* 
Di Capua, G.* 
Peppoloni, S.* 
Darragh, R.* 
Gregor, N.* 
Title: Ground motion recordings from the MW 6.3 2009 L’Aquila earthquake in Italy and their engineering implications
Issue Date: 2012
Series/Report no.: 1/28(2012)
DOI: 10.1193/1.3673621
Keywords: Ground motion
L'Aquila earthquake
Seismic engineering
Fault plane
Subject Classification04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous 
04. Solid Earth::04.06. Seismology::04.06.04. Ground motion 
04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring 
04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis 
04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk 
Abstract: The 2009 L’Aquila earthquake sequence includes the April 6 Mw 6.3 main shock and triggered events on April 7 and 9, each recorded on a digital network having five stations on the hanging wall of the main shock fault. We describe a geometric source model drawing upon inversions by others. We describe record-specific ground motion data processing that includes the incorporation of static displacements of up to 13 cm (downdrop of hanging wall). The resulting database includes 47, 38, and 31 corrected triaxial recordings from the April 6, 7, and 9 events, respectively. We present site conditions for recording stations, including recent surface wave and borehole geophysics. We demonstrate that the high-frequency data are weaker than expected for normal fault earthquakes of these magnitudes and that the data attenuate with distance at rates generally consistent with modified next generation attenuation (NGA) equations for Italy that were available prior to the event.
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