Since the history of strong motion observation began, with the successful acquisition of acceleration records (with a maximum acceleration of 0.23 g) during the Long Beach California earthquake in 1933 (Hudson, 1984), strong-motion records have accumulated for over sixty years. However, there are not yet enough records for us to understand fully the strong ground motions caused by large earthquakes. For this reason we must depend upon traditional investigations of seismic intensities, using questionnaire surveys and on-site damage distribution surveys, for data to supplement our instrumental measurements of strong ground motions.

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As an alternative to earthquake intensity investigations,...

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