000019442 001__ 19442
000019442 005__ 20170118182318.0
000019442 04107 $$aeng
000019442 046__ $$k2017-01-09
000019442 100__ $$aAfifchaouch, Karim
000019442 24500 $$aThe October 1980 El-Asnam Earthquake in N.W. Algeria: Modelling Incoherence Functions of Spatially Variable Seismic Ground Motions

000019442 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019442 260__ $$b
000019442 506__ $$arestricted
000019442 520__ $$2eng$$aThe main objective of this paper is to provide estimates of coherency functions of strong ground motion at engineering bedrock within the El-Asnam region (North-West Algeria). Due to lack of recorded array data, the so-called Empirical Green’s Function (EGF) method is used to simulate ground acceleration at different points in the engineering bedrock of the study area. The event being simulated is the 10 October 1980, Ms 7.2 El-Asnam Earthquake. Ground motion recorded at the Sogedia factory station during the 8 November 1980 aftershock with local magnitude 5.6 was used as empirical Green’s function. Lagged coherency functions estimated from simulated motions indicate significant loss of coherence with increasing frequency and separation distance. Since the EGF method, when used with Green’s function at a single station, can primarily model source effects, which are interpreted as the main reason behind the observed loss of coherency. The results also indicate that source effects are the main source of ground-motion incoherence in the near-source area, whereas it is negligible in the far field. In order to parametrize the estimated lagged coherency functions, they were compared with different models proposed in the literature. Curve fitting using nonlinear least square regression was performed to estimate the parameters of such models. It was found that the Hindy and Novak [1] model provides the best fit to the estimated lagged coherency functions. Along with the model parameters estimated in this study, this model, provides, at least, a first approximation, and possibly, an upper bound of ground motion incoherence in the study area for earthquake scenarios of the type presented in this study. .

000019442 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019442 653__ $$aCoherency function; spatial variability; strong ground motion; Green’s function; El-Asnam Earthquake

000019442 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019442 720__ $$aAfifchaouch, Karim$$iTiliouine, Boualem$$iHammoutene, Malek$$iRupakhety, Rajesh$$iÓlafsson, Símon
000019442 8560_ $$ffischerc@itam.cas.cz
000019442 8564_ $$s346384$$uhttps://invenio.itam.cas.cz/record/19442/files/3631.pdf$$yOriginal version of the author's contribution as presented on USB, paper 3631.
000019442 962__ $$r16048
000019442 980__ $$aPAPER