Abstract
We use teleseismic waveforms from a seismic refraction experiment along a N‐S profile across the Vrancea region, Romania, to study seismic attenuation. This unique data set with an average station spacing of about 2–3 km provides spatial high‐resolution estimates of the variability in seismic attenuation. Time windows of the analyzed seismic phases are extracted with a multiple‐taper technique and spectral ratios (δt*) are determined. Our results from 4 teleseismic phases (P, pP, PKPdf, and PP) of two events underneath Hokkaido, Japan and New Guinea find a significant variation of the seismic attenuation along the line. A major influence of local site effects on the values of δt* can be excluded as well as a correlation with the Vrancea slab. The variations of the δt* operators from different phases at individual stations seem to be caused by the projection of three‐dimensional attenuating structures at deep lithospheric levels.
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