Based on extensive user feedback, it has been determined that there are several errors and ambiguities that need to be corrected in the original manuscript (Campbell, 1997). Some of the errors are the result of typographical errors by the publisher, while others are omissions to the original equations that occurred as an oversight. I also offer some additional guidance on the use of the attenuation relations for calculating ground motion parameters for normal-faulting earthquakes and for sites classified simply as “soil” or “rock.” I hope that these corrections and additional guidance will make the attenuation relations more understandable...

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