Array analysis of seismic surface waves: Limits and possibilities |
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| Authors: | Guust Nolet Giuliano F Panza |
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| Institution: | (1) Vening Meinesz Laboratory, University of Utrecht, Lucas Bolwerk 6, Utrecht, The Netherlands;(2) Istituto di Geodesia e Geofisica, Università di Bari, Palazzo Ateneo, Bari, Italy;(3) Dipartimento di Science della Terra, Università della Calabria, Castiglione Scalo (CS), Italy |
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| Abstract: | Summary The dispersion of higher modes of surface waves over a region covered by an array of stations can be measured by applying a frequency-wavenumber transform to segments of the signals in these stations, centered at a number of group-velocities. Thus, at a fixed period, modes appear as separate maxima in a display of the power spectrum on a phase-velocity vs. group velocity plane.For regions of mild lateral heterogeneity, the main source of error is shown to be due to the inadequacy of the array-response. Numerical experiments with synthetic signals indicate that a precision of the order of 1% can be obtained with a realistic number of stations. Improvements should be obtained by averaging data obtained from different events. The danger of misidentification of modes can be reduced by iteratively removing the sidelobes from the mode-separation diagram. |
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