The 2009 L'Aquila earthquake (central Italy): A source mechanism and implications for seismic hazard

We use InSAR and body‐wave seismology to determine independent source parameters for the 6th April 2009 Mw 6.3 L'Aquila earthquake and confirm that the earthquake ruptured a SW‐dipping normal fault with ∼0.6–0.8 m slip. The causative Paganica fault had been neglected relative to other nearby range‐frontal faults, partly because it has a subdued geomorphological expression in comparison with these faults. The L'Aquila earthquake occurred in an area with a marked seismic deficit relative to geodetically determined strain accumulation. We use our source model to calculate stress changes on nearby faults produced by the L'Aquila earthquake and we find that several of these faults have been brought closer to failure.

[1]  E. Hetland,et al.  Fault Slip Distribution of the Mw 7.9 Wenchuan Earthquake Estimated from GPS and ALOS/PALSAR Measurements , 2009 .

[2]  Nicola D'Agostino,et al.  Active tectonics of the Adriatic region from GPS and earthquake slip vectors , 2008 .

[3]  G. Lavecchia,et al.  Defining a model of 3D seismogenic sources for Seismic Hazard Assessment applications: The case of central Apennines (Italy) , 2004 .

[4]  P. Rosen,et al.  Updated repeat orbit interferometry package released , 2004 .

[5]  Jian Lin,et al.  Stress triggering in thrust and subduction earthquakes and stress interaction between the southern San Andreas and nearby thrust and strike-slip faults , 2004 .

[6]  A. Michetti,et al.  Spatial and temporal variations in growth rates along active normal fault systems: an example from The Lazio–Abruzzo Apennines, central Italy , 2004 .

[7]  Zhong Lu,et al.  Source model for the Mw 6.7, 23 October 2002, Nenana Mountain Earthquake (Alaska) from InSAR , 2003 .

[8]  Peter J. Clarke,et al.  Geodetic strain in peninsular Italy between 1875 and 2001 , 2002 .

[9]  H. Zebker,et al.  Fault Slip Distribution of the 1999 Mw 7.1 Hector Mine, California, Earthquake, Estimated from Satellite Radar and GPS Measurements , 2002 .

[10]  F. Galadini,et al.  New paleoseismological data from the Gran Sasso d'Italia area (central Apennines) , 2002 .

[11]  N. D’Agostino,et al.  Interactions between mantle upwelling, drainage evolution and active normal faulting: an example from the central Apennines (Italy) , 2001 .

[12]  James Jackson,et al.  Migration of activity within normal fault systems: examples from the Quaternary of mainland Greece , 2001 .

[13]  W. Keydel,et al.  Shuttle Radar Topography Mission , 2000 .

[14]  E. Tondi,et al.  Geological analysis and seismic hazard in the Central Apennines (Italy) , 2000 .

[15]  G. King,et al.  STATIC STRESS CHANGES AND THE TRIGGERING OF EARTHQUAKES , 1994 .

[16]  M. Frezzotti,et al.  Palaeoseismicity in the Gran Sasso Massif (Abruzzo, Central Italy) , 1995 .

[17]  Ian Parsons,et al.  Surface deformation due to shear and tensile faults in a half-space , 1986 .