Immediately after a damaging earthquake, emergency managers rapidly seek answers to many important questions: Where is the worst and/or least damage? What equipment and personnel must be mobilized and to what extent? ShakeMap was developed by the U.S. Geological Survey Earthquake Hazards Program to assist in answering these questions by producing near-real-time maps of ground motion and shaking intensity following significant earthquakes (Wald et al. 2004). To produce maps, ShakeMap mimics a dense array of seismometers by using an attenuation relationship to model peak ground motions at virtual or “phantom” stations between existing seismic stations. The modeled data...

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