Discriminating Between Causes of D″ Anisotropy Using Reflections and Splitting Measurements for a Single Path. Issue 5 (15th May 2019)

• Record Type: Journal Article
• Authors: Pisconti, Angelo; Thomas, Christine; Wookey, James
• Is Part Of: Journal of geophysical research. Volume 124:Issue 5(2019)
• Page Start: 4811
• Page End: 4830
• Publication Date: 2019-05-15
• Subjects: D″ -- seismic anisotropy -- array seismology -- shear wave splitting -- postperovskite -- deep mantle flow; Geomagnetism -- Periodicals; Geochemistry -- Periodicals; Geophysics -- Periodicals; Earth sciences -- Periodicals; 551.1
• DOI: 10.1029/2018JB016993
• Languages: English
• ISSNs: 2169-9313

Abstract

Abstract: Knowledge of deep mantle deformation is based on seismic anisotropy: the variation of seismic wave speed and polarization with direction. Measuring this directional dependency requires azimuthal seismic coverage at D″ depth—the bottom few hundred kilometers of the mantle—which is often a limit in retrieving the style of anisotropy. Shear wave splitting is the standard technique for probing mantle anisotropy, and recently, reflections from the D″ region have been used to infer azimuthal anisotropy. Here we combine observations and modeling of D″ reflections with shear wave splitting along a given raypath direction in order to constrain mineralogy and dynamics of the lower mantle. From our modeling, a clear distinction between different anisotropic media is possible by using both types of observations together but only one directional path. We focus on the lowermost mantle beneath the central Atlantic Ocean by using South‐Central American earthquakes recorded in Morocco. We find complex azimuthal and distance variation for both polarities of D″ reflections and shear wave splitting parameters, which rules out a simple style of anisotropy—such as vertical transverse isotropy—for the region. Our preferred model consists of a phase transition from a randomly oriented bridgmanite to lattice‐preferred orientation fabric in postperovskite, developed in a tilted plane sheared along a roughly SW‐NE deformation direction. Key Points: Seismic anisotropy in D″ beneath the Atlantic is detected by using reflections and splitting of seismic waves Modeling of seismic anisotropy shows that mineralogy and deformation can be constrained if both methods are used along a seismic path Our observations are compatible with aligned postperovskite and a SW‐NE deformation direction in the lowermost mantle beneath the Atlantic