Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3303305t&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 3, CiteID L03305
Physics
5
Physical Properties Of Rocks: Wave Attenuation, Seismology: Body Waves, Seismology: Core (1212, 1213, 8124), Seismology: Mantle (1212, 1213, 8124), Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)
Scientific paper
P'P' (PKPPKP) are P waves that travel from a hypocenter through the Earth's core, reflect from the free surface and travel back through the core to a recording station on the surface. Here we report the observations of hitherto unobserved near-podal P'P' waves (at epicentral distance <10°) and very prominent precursors preceding the main energy by as much as 60 s. We interpret these precursors as a back-scattered energy from horizontally connected small-scale heterogeneity in the upper mantle beneath the oceans in a zone between 150 and 220 km depth beneath the Earth's surface. From these observations, we identify a frequency dependence of attenuation quality factor Q in the lithosphere through forward modeling of the observed amplitude spectra of the main and back-scattered P'P' waves.
Cormier Vernon F.
Flanagan Megan P.
Tkalčić Hrvoje
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