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Abstract
On June 8, 2008 a Mw = 6.4 earthquake occurred in NW Peloponnese, western Greece. This event is the largest strike-slip earthquake to occur in western Greece during the past 25 years. No surface rupture was observed. Many rock falls, slides, and liquefaction features have been found as is typical for an earthquake of this size. Double-difference relocations of 370 aftershocks show a linear pattern of events and define a clear NE-SW striking mainshock fault plane. The hypocentrer was determined at 18 km depth beneath village Mihoi in SW Achaia. The 24-hr aftershock region extends approximately 30 km in length, and the width of the surface projection of the aftershocks ranges between 5–10 km. The depth of the aftershocks rarely exceeds 22 km. Analysis of high-rate GPS data showed that station RLS (Riolos) which is located 12.8 km N5°W of the epicenter was displaced co-seismically 7 mm to the North in agreement with right-lateral kinematics of the rupture. Static (Coulomb) stress transfer analysis indicates loading of faults near the towns of Patras (north) and Amaliada (south), respectively. The earthquake put more emphasis on the role of strike-slip in the deformation of western Greece also indicating that seismic strain is partitioned between strike-slip and normal-slip events due to obliquity of the Nubia (Africa) – Eurasia convergence.
Acknowledgments
We thank many colleagues at the Institute of Geodynamics who have maintained the operation of continuous GPS stations and participated in the field work in Kato Achaia during June 2008 and especially Nikos Melis, Sofia Rontogianni, Panagiota Petrou, Panayiotis Argyrakis, Ifigeneia Boutsi, and Kostas Boukouras. We also thank the local witnesses Petros Mourtikas and Antonis Kastanas for their help on the field. We are indebted to George Stavrakakis, Spiros Pavlides, Efthimos Sokos, and Leonidas Stamatopoulos for comments and suggestions. We thank Evangelos Lagios for making available the Leica receiver in station RLS. We used Bob Simpson's DLC code for our stress transfer modeling, and we thank Bob for his help. We plotted some figures using the Generic Mapping Tools (GMT) software. This research was financed by GSRT (http://www.gsrt.gr) and EU project PREVIEW. 30 s data from NOA GPS stations can be downloaded from: http://www.gein.noa.gr/gps.html