Recent large earthquakes that caused ground shaking larger than anticipated have generated interest in how to improve earthquake hazard mapping. Issues under discussion include how to evaluate maps’ performance, how to assess their uncertainties, how to make better maps, and how to best use maps given their limitations.

An important question is what to do after an earthquake yielding shaking larger than anticipated. Hazard mappers have two choices. One is to regard the high shaking as a low‐probability event allowed by the map, which used estimates of the probability of future earthquakes and the resulting shaking to predict the maximum...

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