Premium
Evidence for P′P′ asymmetrical scattering at near podal distances
Author(s) -
Wu Wenbo,
Ni Sidao,
Zeng Xiangfang
Publication year - 2012
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2012gl052179
Subject(s) - slowness , scattering , classification of discontinuities , azimuth , waveform , physics , polarization (electrochemistry) , geology , forward scatter , core (optical fiber) , wave propagation , geometry , computational physics , optics , geophysics , seismology , mathematical analysis , mathematics , chemistry , quantum mechanics , voltage
We report strong short period (0.5–1.2 Hz) precursors to P′P′df at podal to short distances (0–50°) with advance time around 60s. From FK analysis, we find that the precursors at epicentral distance of ∼35° arrive along back‐azimuth about +/−120° off the great circle paths (asymmetrical path) with slowness between 2–4 sec/deg, arguing against propagation path in the inner core. Polarization analysis also supports wave propagation in the outer core. Timing and shape of the precursors' waveform envelopes are well matched with synthetic envelopes taking into account the scattering from the rough free surface and volumetric heterogeneities inside the Earth along asymmetrical propagation path. Therefore the precursors are very probably generated with asymmetrical scattering mechanism. This interpretation does not require extra discontinuities or a layer of strong small scale heterogeneities in the upper mantle, which are inferred from P′P′ precursors when only symmetrical scattering is assumed.