On the incorporation of the effect of crustal structure into empirical strong ground motion estimation

J. Douglas, P. Suhadolc, G. Costa

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

This article has two purposes. Firstly, a validation exercise of the modal summation technique for the computation of synthetic strong-motion records is performed for two regions of Europe (Umbria-Marche and south Iceland), using a variety of region specific crustal structure models, by comparing the predicted ground motion amplitudes with observed motions. It is found that the rate of decay of ground motions is well predicted by the theoretical decay curves but that the absolute size of the ground motions is underpredicted by the synthetic time-histories. This is thought to be due to the presence of low-velocity surface layers that amplify the ground motions but are not included in the crustal structure models used to compute the synthetic time-histories. Secondly, a new distance metric based on the computed theoretical decay curves is introduced which should have the ability to model the complex decay of strong ground motions. The ability of this new distance metric to reduce the associated scatter in empirically derived equations for the estimation of strong ground motions is tested. It is found that it does not lead to a reduction in the scatter but this is thought to be due to the use of crustal structure models that are not accurate or detailed enough for the regions studied.

LanguageEnglish
Pages75-99
Number of pages25
JournalBulletin of Earthquake Engineering
Volume2
Issue number1
DOIs
Publication statusPublished - 1 Jan 2004

Fingerprint

Motion estimation
Model structures
crustal structure
ground motion
decay
histories
strong motion
history
Iceland
effect
incorporation
surface layer
physical exercise
curves
low speed
surface layers

Keywords

  • attenuation relations
  • crustal structure
  • modal summation
  • strong ground motion estimation

Cite this

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On the incorporation of the effect of crustal structure into empirical strong ground motion estimation. / Douglas, J.; Suhadolc, P.; Costa, G.

In: Bulletin of Earthquake Engineering, Vol. 2, No. 1, 01.01.2004, p. 75-99.

Research output: Contribution to journalArticle

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