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Surface waves contain fundamental mode and higher modes, which could interfere with each other. If different modes are not properly separated, the inverted Earth structures using surface waves could be biased. In this study, we apply linear radon transform (LRT) to synthetic seismograms and real seismograms from the USArray to demonstrate the effectiveness of LRT in separating fundamental-mode Love waves from higher modes. Analysis on synthetic seismograms shows that two-station measurements on reconstructed data obtained after mode separation can completely retrieve the fundamental-mode Love-wave phase velocities. Results on USArray data show that higher mode contamination effects reach up to ~10 per cent for two-station measurements of Love waves, while two-station measurements on mode-separated data obtained by LRT are very close to the predicted values from a global dispersion model of GDM52, demonstrating that the contamination of overtones on fundamental-mode Love-wave phase velocity measurements is effectively mitigated by the LRT method and accurate fundamental-mode Love-wave phase velocities can be measured.
Bibliographical noteThis article has been accepted for publication in Geophysical Journal International © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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How the Earth moves: Developing a novel seismological approach to map the small-scale dynamics of the upper mantle
Yang, Y., MQRES, M. & MQRES (International), M. (.
20/01/14 → …
Down under Down Under: Using multi-scale seismic tomography to image beneath Australia's Great Artesian Basin
Yang, Y., Rawlinson, N. & MQRES (International), M. (.
4/05/12 → 31/12/16