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Constraining S-wave velocity using Rayleigh wave ellipticity from polarization analysis of seismic noise

Berbellini, A; Ferreira, AMG; Schimmel, M; Ferreira, AMG; Morelli, A; (2019) Constraining S-wave velocity using Rayleigh wave ellipticity from polarization analysis of seismic noise. Geophysical Journal International , 216 (3) pp. 1817-1830. 10.1093/gji/ggy512. Green open access

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Abstract

We develop a new method for measuring ellipticity of Rayleigh waves from ambient noise records by degree-of-polarization (DOP) analysis. The new method, named DOP-E, shows a good capability to retrieve accurate ellipticity curves separated from incoherent noise. In order to validate the method we perform synthetic tests simulating noise in a 1-D earth model. We also perform measurements on real data from Antarctica and Northern Italy. Observed curves show a good fit with measurements from earthquake records and with theoretical ellipticity curves. The inversion of real data measurements for vS structure shows a good agreement with previous models. In particular, the shear-wave structure beneath Concordia station shows no evidence of a significant layer of liquid water at the base of the ice. The new method can be used to measure ellipticity at high frequency and therefore it will allow the imaging of near-surface structure, and possibly of temporal changes in subsurface properties. It promises to be useful to study near-surface processes in a wide range of geological settings, such as volcanoes, fault zones and glaciers.

Type: Article
Title: Constraining S-wave velocity using Rayleigh wave ellipticity from polarization analysis of seismic noise
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/gji/ggy512
Publisher version: https://doi.org/10.1093/gji/ggy512
Language: English
Additional information: This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Crustal imaging; Seismic noise; Seismic tomography; Site effects; Surface waves and free oscillations
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10066547
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