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The effects of soil layers on strong motion duration were analyzed by' using the strong motion records from 1 叮7 e 甜a缸叫 r 叫 b 】 strong motion duration of a< 缸ccele 咀叮ra訕也 ion (ADT), velocity (VDT) and displacement (DDT) at the alluvial sites were 1.8, 1.6 and 1.4 七 imes respectively, long 釘 than for rock sites. These ratios have some correlation with magnitude, distance and the subsurface structure ofthe Lanyang plain. While strong motion duration has a positive correlation with magnitude and 恤 tance, the co 叮elation between duration and distance may in fact be only part of the magnitude effect. Using regression analysis on the records of 30 earthquakes recorded by the SMARTI arr 呵., we determined the relationship between 的rong motion duration of acceler 前ion, velocity and displacement and local ma 伊 itude. According to Trifunac and Brady (1975), the variability of the duration is caused by inhomogeneous media through which seismic waves propagate, but the results of our study show that duration variability is primarily caused by the complicated rupture process of the earthquake source.

Characteristics of Strong Motion Durations in the SMART1 Array Area