Small-scale lateral variations in D'' attenuation and velocity structure

Details Small-scale lateral variations in D'' attenuation and velocity structure Small-scale lateral variations in D'' attenuation and velocity structure

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30h..18f&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 8, pp. 18-1, CiteID 1435, DOI 10.1029/2002GL016179

Physics

4

Seismology: Body Wave Propagation, Physical Properties Of Rocks: Wave Attenuation, Seismology: Core And Mantle, Tectonophysics: Dynamics, Convection Currents And Mantle Plumes, Tectonophysics: Earth'S Interior-Composition And State (1212)

Scientific paper

Combined ScS-S differential attenuation and travel-time studies, with data from temporary and permanent arrays, produce quality factor, Qμ(D''), estimates for D'' beneath Central America. Similarities between S and ScS ray paths through the upper mantle reduce the upper mantle elastic and anelastic contributions to differential studies. Differential attenuation correlates with ScS attenuation but not S attenuation, indicating that the attenuation primarily stems from lower mantle interactions. We image a ~250 km wide high-attenuation low-velocity anomaly within a ~600 km wide low-attenuation high-velocity region at the core-mantle boundary (CMB). The observed inverse exponential relationship between attenuation and velocity is consistent with a 200 +/- 50 km thermal anomaly, but does not preclude chemical, phase, or structural variations. Observation of a small-scale thermal anomaly within D'' may provide significant evidence in favor one kind of plume formation at the CMB.

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