Rapid characterization of near-fault strong ground shaking is essential for assessment of an earthquake's impact, including the scale of damage and loss. ShakeMap (Wald et al., 1999a) was developed as a tool for this purpose. To generate a ShakeMap, observed peak and spectral ground motion, as well as estimated instrumental intensity (Wald et al., 1999b), are interpolated with a model of ground-motion attenuation to produce contour maps of the various parameters. In California, the California Integrated Seismic Network (CISN) automatically produces ShakeMaps for moderate to large events within several minutes of their occurrence. ShakeMaps...

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