Shabani E. auteur aut IRD Bard P. Y. auteur aut IRD Mirzaei N. auteur aut IRD Eskandari-Ghadi M. auteur aut IRD Cornou Cécile auteur aut IRD Haghshenas E. auteur aut IRD text journalArticle eng text/pdf born digital access The microtremor seismic method using spatial autocorrelation (SPAC) processing is a useful tool for estimating the structure of subsurface layers and the shear wave velocities of sediments. This paper improves upon the well-known 'Modified SPAC' (MSPAC) method, which extends the SPAC formulae for discrete and nearly continuous circular arrays to handle arrays with regular and irregular azimuthal spacing. For finite circular arrays, extended MSPAC (EMSPAC) also takes into account the discrete character of the array, which has been inspired by the works of Okada. Also a new SPAC coefficient is proposed for a nearly continuous array. EMSPAC is applied to real data collected using a seven-station array, and its averaged SPAC coefficients and dispersion curves are compared to those obtained using MSPAC. specialized Spatial analysis Surface waves and free oscillations Site effects 066 182 3 1431-1437 2010 0956-540X https://www.documentation.ird.fr/hor/fdi:010049739 10.1111/j.1365-246X.2010.04687.x 0956-540X [F B010049739] https://www.documentation.ird.fr/hor/fdi:010049739 https://www.documentation.ird.fr/intranet/publi/2010/09/010049739.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2010-10-01 2017-08-23 fdi:010049739 fre