Waveform inversion for D″ structure beneath northern Asia using Hi-net tiltmeter data

Details Waveform inversion for D″ structure beneath northern Asia using Hi-net tiltmeter data Waveform inversion for D″ structure beneath northern Asia using Hi-net tiltmeter data

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3620314k&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 20, CiteID L20314

Physics

Geophysics

8

Seismology: Body Waves, Geodesy And Gravity: Earth'S Interior: Composition And State (7207, 7208, 8105, 8124), Seismology: Mantle (1212, 1213, 8124), Mathematical Geophysics: Inverse Theory

Scientific paper

We invert shear-wave waveform data for the radial variation of (isotropic) shear-velocity in D″ beneath Northern Asia. We reduce source and receiver effects by using data for intermediate and deep events beneath Italy and Japan recorded respectively at stations in East Asia and Europe. Relative to PREM, we find a significantly higher S-wave velocity in the depth range from 150 to 300 km above the core-mantle boundary (CMB) and a slightly lower S-wave velocity in the depth range 0-150 km above the CMB. As our previous studies of D″ structure beneath Central America and the Arctic obtained similar S-wave velocity models, we suggest that this pattern of vertical dependence of shear wave velocity in D″ may be a general phenomenon, at least in relatively cold regions.

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