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  5. 220. MAVROULIS, S., FOUNTOULIS, I., LEKKAS, E. (2010).

220. MAVROULIS, S., FOUNTOULIS, I., LEKKAS, E. (2010).

MAVROULIS, S., FOUNTOULIS, I., LEKKAS, E. (2010). - Primary and secondary environmental effects caused by the Andravida (08-06-2008, ML=6.5, NW Peloponnese, Greece) earthquake. International Association for Engineering Geology, 11th IAEG Congress, paper ID No. 054, p. 451-459, Auckland.

 

On June 8th 2008, and 12:25:28:0 UTC, an earthquake of ML=6,5 and D=15 - 21 km stroke NW Peloponnesus. Many secondary environmental effects were classified as (a) landslides and rockfalls, (b) surface fractures and (c) liquefaction phenomena and they were typical for an earthquake of this magnitude. Landslides and rockfalls were associated with (a) geological formations with characteristics that make them susceptible to failure, (b) the strong heterogeneity, (c) the intense fracturing and weathering, (d) the tectonic deformation along active faults, (e) the additional instantaneous shear stress than an earthquake enforces on a uniform stress field. The surface ruptures were observed in soils and caused damages in infracture. They were caused by (a) the differential seismic response of loose lithologies, (b) the lateral instability of surficial formations and (c) the liquefaction of underlying formations. Liquefaction was manifest in the form of small sand boils involving clean sand in the vicinity of drainage channels and coastlines. The structural damage occurred in the western flat area and in the central and southern hilly area of NW Peloponnesus and mainly in settlements founded at basins formed in the hanging wall of active faults and bounded by them. The western flat area and the southern hilly area consist of post alpine deposits which are sensitive to dynamic loading and undergo easy erosion and leaching by surface water. They are characterized by intense heterogeneity resulting in non-uniform and anisotropic mechanical behaviour. The central hilly area consists of flysch, which presents strong traces of horizontal tectonic deformation and a clear anisotropy controlled by the orientation of discontinuities, the dip of slope, the action of surface water and the degree of looseness. Based on the correlation of the all existing data it is concluded that the seismotectonic, geological and geotechnical regime were determinant to the damage distribution.

 

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