Liquefaction phenomenon created destruction on the marble floor of an Early Christian Basilica at the area of ancient Lechaion port. This phenomenon is dominated in loose, of various grain size, sediments with water playing a key role. That gives great privilege to electromagnetic and geoelectrical methods to detect and discriminate liquefaction zones. Seismic methods though can detect loose sediment layers prone to liquefaction, as well as discriminate areas in relation with compaction after liquefaction phenomenon. The use of MASW method along with seismic refraction and 2D seismic sections with P and S velocities look promising in detecting liquefaction features.


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