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Solid Earth An interactive open-access journal of the European Geosciences Union
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Volume 6, issue 4
Solid Earth, 6, 1117–1130, 2015
https://doi.org/10.5194/se-6-1117-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Solid Earth, 6, 1117–1130, 2015
https://doi.org/10.5194/se-6-1117-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 09 Oct 2015

Research article | 09 Oct 2015

Measuring and crust-correcting finite-frequency travel time residuals – application to southwestern Scandinavia

M. L. Kolstrup1,a and V. Maupin1 M. L. Kolstrup and V. Maupin
  • 1Department of Geosciences, University of Oslo, P.O. Box 1047, 0316 Oslo, Norway
  • anow at: Norwegian Defense Research Establishment, P.O. Box 115, 3191 Horten, Norway

Abstract. We present a data-processing routine to compute relative finite-frequency travel time residuals using a combination of the Iterative Cross-Correlation and Stack (ICCS) algorithm and the Multi-Channel Cross-Correlation method (MCCC). The routine has been tailored for robust measurement of P- and S-wave travel times in several frequency bands and for avoiding cycle-skipping problems at the shortest periods. We also investigate the adequacy of ray theory to calculate crustal corrections for finite-frequency regional tomography in normal continental settings with non-thinned crust. We find that ray theory is valid for both P and S waves at all relevant frequencies as long as the crust does not contain low-velocity layers associated with sediments at the surface. Reverberations in the sediments perturb the arrival times of the S waves and the long-period P waves significantly, and need to be accounted for in crustal corrections. The data-processing routine and crustal corrections are illustrated using data from a~network in southwestern Scandinavia.

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We present a data-processing routine for robust measurements of relative arrival times of P and S waves, filtered in different frequency bands and recorded at regional networks of seismological stations. We also analyse the influence of crustal structure on the arrival times of P and S waves, and find that arrival times are generally different in different frequency bands in the presence of sedimentary layers. These findings are illustrated using data from southwestern Scandinavia.
We present a data-processing routine for robust measurements of relative arrival times of P and...
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