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Neotectonics and recent seismic activity in the Eastern Corinthian Gulf, Greece. Geotechnical implications.

Field analysis of Quaternary fault tectonics, in the area affected by the February-March 1981 earthquakes of the Corinthian gulf, have led to a reconstruction of its stress pattern. Using these field work results together with the measurements on the seismic surface ruptures, it is shown that the upper part of the continental crust is stretching to a N-S direction. It is also observed that this tensional direction is compatible with the tension axis deduced from focal mechanism analysis of the 1981 or previous shallow earthquakes of this region. During these events, the release of seismic energy was facilitated mainly along fault zones activated on an E-W direction, and caused phenomena of surface ruptures, intense failures on the steep slopes, subsidences and vertical movements along the coasts. In addition, the field observations and the geotechnical mapping of the damaged villages showed the close relation among neotectonics, lithology and particular ground foundation conditions with the distribution of the seismic intensities.