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SUMMARYA criterion previously developed by Heredia-Zavoni and Esteva for selecting optimal sensor locations is used to analyse the optimal instrumentation of structures on soft soils. The stochastic response of a linear structural system on a #exible base is formulated for use of the criterion. The case of MDOF shear systems on #exible base, with uncertain lateral sti!ness and subjected to random earthquake ground motions, is studied. The optimal location of accelerometers, the reduction of prior uncertainty on the lateral sti!ness, the e!ects of the base #exibility, the relative in#uence of translation and rocking of the base, and the in#uence of recording noise are assessed and discussed.

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