The 8 june 2008 Mw6.5 Achaia-Elia, Greece earthquake: Source characteristics, ground motions, and ground failure

Basil Margaris, George Athanasopoulos, George Mylonakis, Christos Papaioannou, Nikolaos Klimis, Nikolaos Theodulidis, Alexandros Savvaidis, Vicky Efthymiadou, Jonathan P. Stewart

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


The Mw6.5 Achaia-Elia (Greece) earthquake on 8 June 2008 was a rightlateral strike-slip event on a nearly vertical faul. Moment tensor solutions coupled with geologic structure and aftershock distributions suggest a fault strike of approximately 210° on a previously unmapped fault. Rupture appears to have been concentrated over a 10-25 km depth range and did not break the surface. The northern rupture limit appears to correspond to a NW-striking normal fault near the Kato Achaia coastline. The mainshock was recorded by 27 accelerometers at distances from the surface projection of the fault ranging from approximately 15 to 350 km. The data demonstrate faster distance attenuation than predicted by contemporary Greek ground motion prediction equations (GMPEs). On the other hand, an NGA GMPE generally captures the distance attenuation but shows underprediction bias at short and long periods. Despite the presence of a range of site conditions at recording stations in the city of Patras, we find no obvious effect of sediment depth on response spectra. We show the possible presence of rupture directivity at the north end of this bilateral rupture, but no apparent effect at the southern end. We described several relatively well-documented incidents of nonground failure and ground failure associated with liquefaction/lateral spreading and landslides.

Original languageBritish English
Pages (from-to)399-424
Number of pages26
JournalEarthquake Spectra
Issue number2
StatePublished - May 2010


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