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Authors: Montuori, Caterina* 
Murru, Maura* 
Falcone, Giuseppe* 
Title: Spatial variation of the value observed for the periods preceding and following the 24 August 2016, Amatrice earthquake ML 6.0) (Central Italy)
Issue Date: 2016
Series/Report no.: FAST TRACK 5/59 (2016)
DOI: 10.4401/ag-7273
Keywords: Amatrice earthquake
Gutenberg Richter law
Subject Classification04.06. Seismology 
04.07. Tectonophysics 
05.08. Risk 
Abstract: This paper deals with a preliminary spatial and temporal analysis of the b-value variability, observed in the area where the August 2016 Amatrice earthquake (ML6.0) occurred. With comparison of the pre- and post periods of the mainshock, an investigation of anomalous zone of b-values was performed aiming to find possible links with barriers and/or asperities in the crustal volume where seismic sequence was developed. Preliminary results show an area with high b-value (b=1.6) where the mainshock originated. Conversely, two low b-value (b=0.8) volumes are located at the border of the seismogenic structure. The location of these two areas is consistent with a preliminary fault slip inversion, suggesting the presence of two highly stressed patches of co-seismic deformation located NW and SE of the mainshock, with a high potentiality to rupture causing a possible moderate or larger event: the first one in the North (Norcia), the second one in South, next to the area of Amatrice and Campotosto.
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