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Publication . Article . 2018

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

Andrea Berbellini; Martin Schimmel; Ana M. G. Ferreira; Andrea Morelli;
Open Access  
Published: 30 Nov 2018
Publisher: Oxford University Press
Country: Spain
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 v S 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. © The Author(s) 2018. Published by Oxford University Press on behalf of The Royal Astronomical Society.
This work received a fundamental contribution by TIDES COST Action ES1401 (in particular by Short Term Scientific Mission program). A.M.G. Ferreira and A. Berbellini are also grateful for funding from NERC project NE/N011791/1. M. Schimmel acknowledges funding by the Spanish MISTERIOS project (CGL2013-48601-C2-1-R).
Peer reviewed
Subjects by Vocabulary

Microsoft Academic Graph classification: Geodesy Seismic tomography S-wave Ambient noise level Geology Seismic noise Northern italy Polarization (waves) Rayleigh wave symbols.namesake symbols Inversion (meteorology)

arXiv: Physics::Geophysics

Subjects

Crustal imaging, Seismic noise, Seismic tomography, Site effects, Surface waves and free oscillations, Seismology, Geochemistry and Petrology, Geophysics, Crustal imaging, Seismic noise, Seismic tomography, Site effects, Surface waves and free oscillations, Seismology

Funded by
EC| EPOS IP
Project
EPOS IP
EPOS Implementation Phase
  • Funder: European Commission (EC)
  • Project Code: 676564
  • Funding stream: H2020 | RIA
Validated by funder
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EPOS