Complexity of D'' in the presence of slab-debris and phase changes

Details Complexity of D'' in the presence of slab-debris and phase changes Complexity of D'' in the presence of slab-debris and phase changes

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3312s07s&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 12, CiteID L12S07

Physics

9

Geodesy And Gravity: Earth'S Interior: Dynamics (1507, 7207, 7208, 8115, 8120), Seismology: Body Waves, Seismology: Mantle (1212, 1213, 8124), Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)

Scientific paper

A lower mantle S-wave triplication with a Scd branch is easily observed beneath Central American and its lateral variations has been studied extensively. Attempts to model Scd depth variations with a phase boundary based on tomography predict smooth variations [e.g., Sidorin et al., 1999a]. Recently, Hutko et al. [2005] presents evidence of a sharper feature with a vertical step-like jump of over 50 km, for paths sampling the western edge of a fast lower mantle structure beneath the Cocos Plate. We present a similar type of very anomalous Scd waveforms sampling the edge further to the east. We are able to model these waveforms by adopting the phase-boundary model but enhancing the existing tomographic anomaly just above the velocity jump, which appears to be a folded-slab.

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