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Journal Articles Geophysical Journal International Year : 2020

Arrival-angle effects on two-receiver measurements of phase velocity

Fabrizio Magrini
  • Function : Author
Giovanni Diaferia
  • Function : Author
Fabio Cammarano
  • Function : Author


We compile a data set of Rayleigh-wave phase velocities between pairs of stations, based on teleseismic events located on the same great circle as the two stations. We validate our observations against dispersion estimates based on ambient-noise cross correlations at the same station pairs. Discrepancies between the results of the two methods can in principle be explained by deviations in the wave propagation path between earthquake and receivers, due to lateral heterogeneity in the Earth's structure, but the latter effect has, so far, not been precisely quantified nor corrected for. We implement an algorithm to measure the arrival angle of earthquake-generated surface waves and correct the dispersion measurements accordingly. Application to a data set from the Central-Western Mediterranean shows that the arrival-angle correction almost entirely accounts for the discrepancy in question, decreasing significantly the velocity bias for a wide range of periods.
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Dates and versions

insu-03691317 , version 1 (06-09-2022)



Fabrizio Magrini, Giovanni Diaferia, Lapo Boschi, Fabio Cammarano. Arrival-angle effects on two-receiver measurements of phase velocity. Geophysical Journal International, 2020, 220, pp.1838-1844. ⟨10.1093/gji/ggz560⟩. ⟨insu-03691317⟩
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