Civil Engineering Reference
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Figure 7.25
Parametric spectra for 1985 Vina del Mar Chile earthquake
(modified after Vasquez, 1996)
7.4.8 Spatial Variation of Ground Motions
The term spatial variation of ground motions denotes the differences in amplitude
and phase of seismic motions recorded over extended areas. The spatial variation
of ground motions has an important effect on the response of buildings and
lifelines, especially in long structures such as bridges, pipelines, communication
transport systems, etc. (Zerva and Zervas, 2002).
Spatial variation in ground motions arises from the following causes (Der
Kiureghian and Keshishian, 1996) (Fig. 7.26):
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