Published online by Cambridge University Press: 28 June 2012
The September 19, 1985, Mexico earthquake reminded scientists and engineers of the importance of considering soil amplification effects in earthquake-resistant design. The Mexico earthquake illustrated the “worst case”—the ground response and the building response occurring at approximately the same period, 2 seconds. This resonance phenomenon was predictable on the basis of similar experiences in past earthquakes. A number of areas in the United States also exhibit significant predictable soil amplification effects. Special steps are needed in these areas to mitigate the potential damage and losses that could occur in future earthquakes.