Strasser and Bommer (2009) raise some important issues on maximum amplitudes of strong ground motion parameters. Any method of risk assessment operates under uncertainty and there are trade-offs between costs, benefits, and risks to be considered. Peak ground acceleration (PGA) has been shown to be a very poor indicator of building damage, yet it is commonly used to predict earthquake risk for want of a better one. The credibility of a model of risk management that uses PGA as input depends primarily on its performance, meaning its impact on future actions adopted by decision-makers today.

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Strasser and Bommer conclude that...

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