SEDA a software package for the Statistical Earthquake Data Analysis: a tutorial application to the 2009 L'Aquila and the 2012 Emilia (Italy) sequences

Anna Maria Lombardi
2017 Annals of Geophysics  
The main purpose of this paper is to provide a tutorial application of SEDAv1.0, the first version of a software package, recently designed for the statistical analysis of earthquake data. SEDAv1.0 consists of a user-friendly Matlab-based interface, to facilitate the interaction with the application, and of a computational core of Fortran codes, to guarantee fast running times. The main part of SEDAv1.0 is devoted to the ETAS modeling. For the first time, an almost complete set of consistent
more » ... et of consistent tools based on ETAS models is collected in a single, free software. Moreover, SEDA guarantees the research reproducibility, which is becoming an increasingly major concern among scientists. The peculiarities of some routines of SEDAv1.0 are discussed in this paper, by the application to two important recent seismic sequences occurred in Italy. Specifically, the paper illustrates how using SEDAv1.0, to estimate the completeness magnitude and the b-value, to set and test the ETAS model and, finally, to identify the earthquakes sequences, basing on causal connections. Cases Study: the 2009 ML5.9 L'Aquila and the 2012 ML5.9 Emilia sequences The L'Aquila and the Emilia sequences are located in areas with different tectonic structure and have specific peculiarities. The L'Aquila region is inside the Central Apennines belt, with prevalent normal faulting, whereas the Emilia area covers alluvial lowland, with thrust faulting. The L'Aquila mainshock was preceded by at least 3 months of moderate-size seismicity and struck an highly hazardous seismic zone of Italy (Stucchi et al., 2010) . The Emilia sequence, occurred in a relatively low seismic hazard area, was characterized by a migration of the seismicity towards the E and NE and its strongest aftershock (May 29, 2012, ML5.8) has a magnitude close to the mainshock.
doi:10.4401/ag-7077 fatcat:gvdbnphpefdxllxvvun6gp242i