Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 10 1 2010 10.5194/nhess-10-73-2010 http://www.nat-hazards-earth-syst-sci.net/10/73/2010/ http://www.nat-hazards-earth-syst-sci.net/10/73/2010/nhess-10-73-2010.html http://www.nat-hazards-earth-syst-sci.net/10/73/2010/nhess-10-73-2010.pdf 73 87 2010-01-14 Deformation pattern of the 6 and 7 April 2009, <i>M</i>_W=6.3 and <i>M</i>_W=5.6 earthquakes in L'Aquila (Central Italy) revealed by ground and space based observations I. D. Papanikolaou i.papanikolaou@ucl.ac.uk M. Foumelis I. Parcharidis E. L. Lekkas I. G. Fountoulis Laboratory of Mineralogy & Geology, Department of Geological Sciences and Atmospheric Environment, Agricultural University of Athens, 75 Iera Odos Str., 118 55, Athens, Greece AON Benfield Hazard Research Centre, Department of Earth Sciences, Birkbeck College and University College London, WC1E 6BT, London UK Department of Geophysics – Geothermics, National and Kapodistrian University of Athens, Panepistimioupolis, Ilissia, 157 84, Athens, Greece Department of Geography, Harokopio University of Athens, El. Venizelou 70, Kallithea, 176 71, Athens, Greece Department of Dynamic, Tectonic and Applied Geology, National and Kapodistrian University of Athens, Panepistimioupolis, Ilissia, 157 84, Athens, Greece The deformation pattern of the 6 and 7 April 2009 <i>M</i>_W=6.3 and <i>M</i>_W=5.6 earthquakes in L'Aquila is revealed by DInSAR analysis and compared with earthquake environmental effects. The DInSAR predicted fault surface ruptures coincide with localities where surface ruptures have been observed in the field, confirming that the ruptures observed near Paganica village are indeed primary. These ruptures are almost one order of magnitude lower than the ruptures that have been produced by other major surrounding faults in the past. These faults have not been activated during the 2009 event, but have the capacity to generate significantly stronger events. DInSAR analysis shows that 66% (or 305 km²) of the area deformed has been subsided whereas the remaining 34% (or 155 km²) has been uplifted. A footwall uplift versus hangingwall subsidence ratio of about 1/3 is extracted from the mainshock. The maximum subsidence (25 cm) was recorded about 4.5 km away from the primary surface ruptures and about 9 km away from the epicentre. 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