On the limitations of interstation distances in ambient noise tomography

Yinhe Luo*, Yingjie Yang, Yixian Xu, Hongrui Xu, Kaifeng Zhao, Kai Wang

*Corresponding author for this work

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Abstract

Ambient noise tomography (ANT) has recently become a popular tomography method to study crustal structures thanks to its unique capability to extract short-period surface waves. Empirically, in order to reliably measure surface wave dispersion curves from time-domain cross-correlations, interstation distances between a pair of stations have to be longer than two/three wavelengths. This requirement imposed a strong constraint on the use of ANT at the long-period end at local-and regional-scale tomography studies. In this study, we use ambient noise data from USArray/Transportable Array recorded during 2007-2012 to investigate whether dispersion measurements from cross-correlations of ambient noise at short interstation distances are consistent with those at long distances and whether the short-path dispersion measurements can be used in tomography, especially in local-and regional-scale tomography. Our results show that: (1) surface wave phase velocity dispersion curves measured by a frequency-time analysis technique (FTAN) from time-domain cross-correlations are consistent with those measured by a spectral method tracing the zero crossings of the real part of cross-spectrum functions in frequency domain; (2) dispersion measurements from time-domain cross-correlations with short interstation distances, up to only one wavelength, are consistent with and also reliable as those with interstation distances longer than three wavelengths and (3) these short-path measurements can be included in ANT to improve path coverage and resolution.

Original languageEnglish
Pages (from-to)652-661
Number of pages10
JournalGeophysical Journal International
Volume201
Issue number2
DOIs
Publication statusPublished - May 2015

Bibliographical note

Copyright The Authors 2015. First published in Geophysical Journal International, Volume 201, Issue 2, pp. 652-661. The original publication is available at http://doi.org/10.1093/gji/ggv043, published by Oxford University Press on behalf of The Royal Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • Surface waves and free oscillations
  • Seismic tomography
  • Computational seismology

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