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Salinas V.,Polytechnic University of Catalonia | Luzon F.,University of Almeria | Garcia-Jerez A.,Campus Universitario Cartuja | Sanchez-Sesma F.J.,University Ingenieria | And 4 more authors.
Bulletin of the Seismological Society of America | Year: 2014

It has been recently demonstrated that averaging the autocorrelations of fields produced by various almost-vertical incoming elastic body plane waves upon a layered system approximately leads to the imaginary part of the corresponding 1D Green's functions for deep sources located underneath the receiver (Kawase et al., 2011). Thus, the ensemble of these waves from deep earthquakes recorded in a station located in the epicentral zone is interpreted as a diffuse field. In this short note, we extend the study to consider earthquakes recorded in a station located at epicentral distances of up to hundreds of kilometers.We consider the horizontal-to-vertical spectral ratio (HVSR) of the averaged P, S, and coda waves and full earthquake records at the Cibeles station (Mexico City Accelerometric Network) and compare these with the results obtained with the corresponding HVSR for the 1D (Kawase et al., 2011) and the 3D (Sánchez-Sesma, Rodríguez, et al., 2011) diffuse fields models. Using the signals of 90 earthquakes recorded at Cibeles, we find that the experimental results have distinctive features compatible with the 3D signature of a diffuse field. We interpret this result as a consequence of the multiple paths that seismic waves undergo from the subducting slab to the Mexico City valley and to the multiple scattering in a complex tectonic environment. Our study strongly suggests that we can use strongmotion records from earthquakes and apply similar techniques to the ones used to analyze the ambient seismic field. Source


Roca J.,Campus Universitario Cartuja | Roca J.,University of Valencia | Padilla J.-L.,Campus Universitario Cartuja | Lopez-Ramon M.-F.,Campus Universitario Cartuja | And 2 more authors.
Transportation Research Part F: Traffic Psychology and Behaviour | Year: 2013

The Attention-Related Driving Errors Scale (ARDES) is a self-reported questionnaire to assess individual differences in the proneness to make attentional errors while driving. The aims of the current work are to adapt the original Argentinean version of the ARDES to the culture, language, traffic regulations and driving habits of Spain and provide new validity evidence of the cross-cultural equivalence of the scale. In the first step of the validation process, five external independent experts reviewed the original ARDES-Argentina and proposed modifications, adapted to the culture, language, traffic regulations and driving habits in Spain. Secondly, a sample of 320 drivers completed the adapted questionnaire. Descriptive statistics and psychometric properties (corrected item-total correlation, Cronbach's alpha and factor structure) were performed on the data. Besides, in order to obtain further validity evidence, the relationships between the questionnaire scores and socio-demographic variables (age, sex, educational level, driving experience, crash involvement and traffic fines received) were analyzed. Factor analysis suggested a single factor that exceeded the parallel analysis criterion and accounted for 32.70% of the total variance. All items showed positive loadings on this factor, ranging from.41 to.72. The corrected item-total correlation values extend from.41 to.60, indicating that the items had good discrimination power. Cronbach's alpha coefficient value was.88. The analysis of the relationships between ARDES-Spain scores and socio-demographic variables provided further validity evidence of the appropriateness of the adapted questionnaire. In particular, differences in ARDES-Spain scores were found between drivers who reported traffic collisions with material damage and participants who did not. In conclusion, results in the current study suggest that the adapted version of the ARDES is a useful tool for evaluating the proneness to attentional errors during driving in the Spanish population. Future studies adapting the questionnaire to other countries with different languages, cultures, traffic regulations and driving habits are encouraged in order to expand the discussion on the cross-cultural equivalence of the ARDES. © 2013 Elsevier Ltd. All rights reserved. Source

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