Correlation Models for Strong Ground Motions From Vrancea Intermediate-Depth Seismic Source


Abstract eng:
The issue of correlation models of strong ground motions is widely discussed in the literature. Numerous investigations of residuals obtained on various datasets of strong ground motions with different ground motion prediction equations offer spatial correlation models for either peak ground parameters or spectral response acceleration values. In this study, a dataset of 431 triaxial accelerograms recorded during ten earthquakes originating in the Vrancea intermediate-depth seismic source is used to obtain correlation models for peak ground accelerations and spectral response acceleration values. The inter- and intra-event residuals are obtained using a ground motion prediction equation for the geometric mean of two horizontal orthogonal components developed purposely for Vrancea intermediate-depth seismic source. The observed correlation coefficients for the geometric mean of the two orthogonal horizontal components and for the randomly orientated horizontal component at different vibration periods are obtained using relations available in the literature. Empirical relations of spatial intra-event correlation coefficients with respect to the separation distance between observation sites and correlation lengths based on the geometric mean of two orthogonal horizontal components and on the randomly oriented horizontal component are calculated using the assembled Vrancea ground motion database. The results show that the spatial intra-event correlation decreases as the separation distance increases. Higher correlation coefficients are obtained when considering the geometric mean of the two horizontal components of ground motions than for the randomly orientated horizontal component. A gradual decay of the correlation coefficient with separation distance and long correlation lengths have resulted. The fitted spatial correlation models for Vrancea intermediate-depth seismic source are discussed and compared with other models reported in the literature for different seismo-tectonic contexts.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



Record appears in:



 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 2026.:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)