The rich near-fault recordings from the Chi-Chi earthquake made it possible to study the characteristics of near-fault ground motion in detail. However, there are considerable shifts of baseline in the near-fault acceleration records of this event. The reasons causing the shifts of baseline are more complex than those that occurred in other near-field recordings with greater fault distance. Hence, the general baseline correction schemes for strong-motion recordings, such as the method of BAP (Converse, 1992) and Iwan (Iwan et al., 1985), could not remove the shifts of baseline superimposed in the near-fault recordings of this...

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