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Global tomography using seismic hum

AuthorsHaned, A.; Stutzmann, E.; Schimmel, Martin ; Kiselev, S.; Davaille, A.; Yelles-Chaouche, A.
KeywordsSeismic tomography
Surface waves and free oscillations
Time-series analysis
Issue Date2016
PublisherOxford University Press
CitationGeophysical Journal International, 204(2): 1222-1236 (2016)
AbstractWe present a new upper-mantle tomographic model derived solely from hum seismic data. Phase correlograms between station pairs are computed to extract phase-coherent signals. Correlograms are then stacked using the time-frequency phase-weighted stack method to build-up empirical Green's functions. Group velocities and uncertainties are measured in the wide period band of 30-250 s, following a resampling approach. Less data are required to extract reliable group velocities at short periods than at long periods, and 2 yr of data are necessary to measure reliable group velocities for the entire period band. Group velocities are first regionalized and then inverted versus depth using a simulated annealing method in which the number and shape of splines that describes the S-wave velocity model are variable. The new S-wave velocity tomographic model is well correlated with models derived from earthquakes in most areas, although in India, the Dharwar craton is shallower than in other published models.
Publisher version (URL)http://dx.doi.org/10.1093/gji/ggv516
Appears in Collections:(ICTJA) Artículos
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