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Interactive processing to obtain interstation surface-wave dispersion

DEPARTMENT OF PHYSICS THE UNIVERSITY OF TEXAS AT EL PASO, EL PASO, TEXAS 79968
DEPARTMENT OF GEOLOGICAL SCIENCES THE UNIVERSITY OF TEXAS AT EL PASO, EL PASO, TEXAS 79968

Abstract

A processing scheme for the analysis of surface-wave dispersion is presented. This scheme involves preprocessing seismograms, computing the interstation Green's function, and determining the self-consistent phase and group dispersion with standard errors for one or more events for a two-station path. Time-variable filtering is employed, based on group velocity that is computer-selected by the multiple filter technique and refined by phase matching iteration. The interstation Green's function is frequency filtered to remove spikes from the spectrum. The interstation group velocity, perturbed by standard errors and refined by phase matching, is used to determine phase velocity and its uncertainty. Self-consistency between phase and group velocity is obtained by a simultaneous least-squares method, which ensures the correct functional relation for the two dispersed velocities. The uncertainty in dispersion is computed from the covariance matrix of the simultaneous least-squares solution. The technique is evaluated by comparing the analyzed dispersion for a path along the Andean Cordillera with results employing other techniques.