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Determination of resonant properties of near-surface layer using microtremor data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering, Apr 2019, Volume 2019, p.1 - 5
Abstract
We study the possibilities of direct determination of the resonant properties of near-surface sediments using microtremor records. The results of the passive seismic observations showed that the averaging amplitude spectra of a large number of noise records makes it possible to extract the standing waves generated in the near-surface layer from the microtremor. The frequencies of these waves (natural frequencies of the sediment layer) characterize the resonant properties of the near-surface sediments, and their amplitudes can be used to estimate the ground motion amplification relative to nearby places where unconsolidated sediments are absent. Recording both vertical and horizontal microtremor components allows to estimate the Poisson’s ratio of near-surface soils.