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Rapid (3‐5 minutes) generation of maps of instrumental ground‐motion and shaking intensity is accomplished through advances in real‐time seismographic data acquisition combined with newly developed relationships between recorded ground‐motion parameters and expected shaking intensity values. Estimation of shaking over the entire regional extent of southern California is obtained by the spatial interpolation of the measured ground motions with geologically based frequency and amplitude‐dependent site corrections. Production of the maps is automatic, triggered by any significant earthquake in southern California. Maps are now made available within several minutes of the earthquake for public and scientific consumption via the World Wide Web; they will be made available with dedicated communications for emergency response agencies and critical users.
Wald et al. (Sun,) studied this question.