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Authors: De Gori, P.* 
Lucente, F. P.* 
Lombardi, A. M.* 
Chiarabba, C.* 
Montuori, C.* 
Title: Heterogeneities along the 2009 L’Aquila normal fault inferred by the b-value distribution
Journal: Geophysical Research Letters 
Series/Report no.: /39 (2012)
Publisher: American Geophysical Union
Issue Date: 4-Aug-2012
DOI: 10.1029/2012GL052822
Keywords: L'Aquila earthquake, b-value, heterogeneities, seimicity parameters.
Subject Classification04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution 
Abstract: In this study we map the distribution of the b-value of the Gutenberg-Richter law—as well as complementary seismicity parameters—along the fault responsible for the 2009 MW 6.1 L'Aquila earthquake. We perform the calculations for two independent aftershock sub-catalogs, before and after a stable magnitude of completeness is reached. We find a substantial spatial variability of the b-values, which range from 0.6 to 1.3 over the fault plane. The comparison between the spatial distribution of the b-values and the main-shock slip pattern shows that the largest slip occurs in normal-to-high b-values portion of the fault plane, while low b-value is observed close to the main-shock nucleation. No substantial differences are found in the b-value computed before and after the main-shock struck in the small region of the fault plane populated by foreshocks.
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