Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3210301s&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 10, CiteID L10301
Physics
3
Seismology: Subduction Zones (1207, 1219, 1240), Seismology: Lithosphere (1236), Tectonophysics: Continental Tectonics: Compressional, Geographic Location: Europe
Scientific paper
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.
Ritter Joachim R. R.
Sudhaus Henriette
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