1. NEHRP (1997). Recommended provisions for seismic regulations for new buildings and other structures, Part 1: Provisions (FEMA 302).
2. EC-8, 2000. Design provisions for earthquake resistance of structures, part 3: ground conditions and seismic action. prEN 1998-1, Draft May 2000, European Committee for Standardization, Brussels.
3. US Geol. Surv. (USGS) National Earthquake Information Center, World Data Center A for Seismology, http://wwwneic.cr.usgs.gov/neis/FM/Q9909071156.html
4. Harvard CMT catalog, http://www.seismology.harvard.edu.
5. University of Thessaloniki, Geophysical Laboratory (GLUT), http://lemnos.geo.auth.gr/.