- © 2014 by the Seismological Society of America
The National Observatory of Athens (NOA) produces the NOA earthquake catalog since 1964. For its 50 year anniversary, we describe the evolution of the Greek seismic network by examining its performance in terms of completeness magnitude Mc.
Over its 50 years of existence, the earthquake catalog of Greece has improved on the basis of several network upgrades. The mid‐1960s marked the start of the modern Greek seismic network coordinated by the NOA. Since then, the earthquake catalog of NOA has been published with no interruption. Three main upgrades of the network are notable. (1) The passage from analog‐to‐digital instrumentation and processing took place in 1995. (2) The development of the Hellenic Unified Seismological Network (HUSN) took place gradually from the end of 2007 to 2011, which combined the NOA network to three university networks (Athens, Patras, and Thessaloniki). In addition, (3) the upgrade of the magnitude determination software happened in early 2011. More information about the history and characteristics of the Greek seismic network can be found in the literature (Båth, 1983; Chouliaras and Stavrakakis, 1997; Papanastassiou et al., 2001; Papanastassiou, 2010; Roumelioti et al., 2010; D’Alessandro et al., 2011; Deshcherevskii and Sidorin, 2012; Chouliaras et al., 2013).
The goal of the present study is to provide the first comprehensive spatiotemporal analysis of the Greek seismic network performance in terms of completeness magnitude Mc, computed using the recently proposed Bayesian magnitude of completeness (BMC) method (Mignan et al., 2011). We additionally make an in‐depth analysis of the frequency–magnitude distribution (FMD) to validate the BMC results and to provide additional recommendations for the computation of Mc.
We used the NOA earthquake catalog, available at http://www.gein.noa.gr/en/seismicity/earthquake-catalogs (last accessed October 2013), and defined the study area (19° E; 29° E; 34° N; 42° N). We considered …