Keywords: seismic monitoring, structural response, global positioning system, realtime, acceleration, displacement, drift ratio, performance, array, soil-structure interaction.

This chapter presents a summary of the seismic monitoring issues as practiced in the past, as well as current applications and new developments to meet the needs of the engineering and the user community. A number of examples exhibit the most recent applications that can be used for verification of design and construction practices, realtime applications for the functionality of built environment and assessment of damage conditions of structures. Recent developments and approaches (using GPS technology and real-time double-integration) are being used to obtain displacements and, in turn, drift ratios, in real-time or near real-time that are related to damage condition and therefore functionality of a structure. Other special instrumentation arrays that include additional sensors to study soil-structure interaction and wave propagation are described.

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