Monitoring the soil seismic response change with InSAR data: application to the Mexico City subsidence

Albano M., Polcari M., Bignami C., Moro M., Saroli M., Stramondo S.
  Mercoledì 28/09   16:30 - 19:00   Edificio Psicologia 2 - Aula 2A   IV - Geofisica, Fisica dell'ambiente
We developed an empirical procedure to retrieve the changes in soil seismic response caused by fast land subsidence. The method combines the subsidence information provided by spaceborne SAR Interferometry with $a priori$ geological/geotechnical information to estimate the shortening of the soil vibration periods in urban environments. The procedure has been applied to Mexico City. SAR data from Envisat and Radarsat-2 constellations have been combined with the iso-period and iso-depth maps of the soils in the lakebed zone of Mexico City. The retrieved amount of resonant period change highlights the need to update the building codes to account for the change of dynamic properties of soils caused by subsidence.