Geophysical/seismological based methods for seismic response assessment of the built environment and its interaction with the ground: an overview

Philippe Guéguen
ISTerre, Université Grenoble Alpes, CNRS, Université Gustave Eiffel

The complexity of the urban environment (i.e., multitude of diverse and scattered structural designs, variability of short wavelength site conditions, cross-interaction between soil and structures…) is addressed after each earthquake when assessing and interpreting the observed damage. The full-waveform of the urban seismic motion is then difficult to interpret and model. Considering that data from full-scale observations in a built environment are more valuable than even the most sophisticated numerical or laboratory experiments, an effective solution to advance the science of predicting earthquake effects in urban areas is to interpret the actual seismic response from the site-city data. Seismological data at ground level or in structures are then much needed for the development and calibration of realistic models, but mostly to validate and/or highlight some processes activated during earthquakes in built-up areas. In this presentation, geophysical based methods applied to site-city seismological observations will be discussed as well as their added value for a better understanding of the response of earthquake-prone cities.