A new probe of ULVZ S-wave velocity structure: Array stacking of ScS waveforms

Details A new probe of ULVZ S-wave velocity structure: Array stacking of ScS waveforms A new probe of ULVZ S-wave velocity structure: Array stacking of ScS waveforms

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3307314a&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 7, CiteID L07314

Physics

12

Seismology: Body Waves, Seismology, Seismology: Core (1212, 1213, 8124), Seismology: Mantle (1212, 1213, 8124), Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)

Scientific paper

S-wave velocity reductions in thin layers above the core-mantle boundary (CMB) are resolved by modeling precursors to the tangential-components of core-reflected ScS phases. Unlike most phases used to study ultra-low velocity zone (ULVZ) structure, ScS provides direct sensitivity to shear velocity structure, VS. Recordings of deep earthquakes in the Tonga-Fiji and South American subduction zones at broadband seismic networks in western North America are used to map small-scale ULVZ variability. A two-layer low-VS structure exists under the central Pacific: an abrupt 0.8-2.0% decrease 60-86 km above the CMB is underlain by a 24-30 km thick ULVZ layer having reductions of 3.3-7.4% (with respect to PREM). No corresponding velocity reductions are found under the Cocos plate. The structure above the ULVZ may be associated with reverse transformation of post-perovskite to perovskite in a steep thermal gradient in a boundary layer above the CMB.

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