Detection of Lagrangian displacements induced in seismic source regions and its implementation for land conservation

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Strong ground motion records are often missing or very sparsely available especially in the developing countries, discouraging all attempts for rational rehabilitation. Something that should not be forgotten in talking about rehabilitation is that a large earthquake often causes long lasting geo-technical problems, in which terrain changes are to be thoroughly studied. A method is presented to extract Lagrangian ground displacements from an available set of aerial/satellite data capturing sub-aerial topography. Its application to the Mid-Niigata Prefecture Earthquake, a well recorded and documented seismic event, has shown good correlation with the field measurements and/or observations. Also the method was used to prepare precise map of soil subsidence for Tokyo bay shore areas liquefied in the March 11th, 2011 off the Pacific Coast of Tohoku Earthquake.