EUROSEISTEST is a European, multi‐purpose physical laboratory (test site) established in 1993 in the tectonically active graben of Mygdonia, a few tens of kilometers away from the city of Thessaloniki, in northern Greece (Fig. 1a; http://euroseis.civil.auth.gr; Pitilakis et al. , 2011). It is one of the longest‐running test sites in the world, providing researchers with high‐quality multidisciplinary data and facilities for conducting innovative experimental (e.g., Raptakis et al. , 1998; Jongmans et al. , 1998; Pitilakis et al. , 1999; Raptakis et al. , 2000) and theoretical studies (e.g., Chavez‐Garcia et al. , 2000; Makra et al. , 2001, 2005; Semblat et al. , 2005) on ground motion, site effects, soil, and site characterization (e.g., Raptakis et al. , 2000, 2005; Manakou et al. , 2010), wave propagation and soil‐foundation–structure interaction (e.g., Gueguen et al. , 2000). The establishment and operation of the experimental site has been under the responsibility of the Research Unit of Soil Dynamics and Geotechnical Earthquake Engineering (SDGEE) of the Civil Engineering Department of the Aristotle University of Thessaloniki with the contribution of the Institute of Engineering Seismology and Earthquake Engineering of the Earthquake Planning and Protection Organization of Greece (ITSAK‐EPPO), among other partners. EUROSEISTEST was initially funded by the European Union (EU; Directorate General XII for Research, Science & Technology) through three consecutive research projects: EUROSEIS‐TEST (EV5V‐CT.93‐0281, 1993–1995), EUROSEIS‐MOD (ENV4‐CT.96‐0255, 1996–1999), and EUROSEIS‐RISK (EVG1‐CT‐2001‐00040, 2002–2005). Since 2005, the maintenance and further development of the test site have been funded through resources of the SDGEE, several other EU (e.g., SERIES, http://www.series.upatras.gr/; NERA, http://www.nera-eu.org/) and international projects. In 2013, EUROSEISTEST completes 20 years of operation. During this time, its permanent strong‐motion network has recorded 190 seismic events, mostly from in and around the Mygdonia basin, but also few at regional distances (Fig. 1a). Recorded acceleration time series and …