Is inner core translation a good model? Vernon Cormier, Lizzie Day, Zack Geballe, Marine Lasbleis, Mohammad Youssof, Han Yue.

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Presentation transcript:

Is inner core translation a good model? Vernon Cormier, Lizzie Day, Zack Geballe, Marine Lasbleis, Mohammad Youssof, Han Yue

Does the inner core grows layer by layer? Does it convect? Deguen, 2012

Modified from a figure by Jessica Irving Inner inner core? EastWest FAST isotropic velocity More attenuating (low Q) Less anisotropic SLOW isotropic velocity Less attenuation (high Q) More anisotropic Summary of seismic features

Waszek & Deuss, JGR, 2012 Hemispheres of P-wave travel time

T-dependent viscoelasticity is not the cause East West

8.5 mol % Si < 8.8 mol % Si Composition is an unlikely cause Cottaar and Buffet (2012) Alfe et al. (2002)

Translation: a type of convection SlowFast Monnereau et al., Science, 2010

Translation: a type of convection Make figure of isetropes and geotherm to show that latent heat fights convection.

Age distribution in a translating inner core 300 km 500 km Age (Ma) km 100 km

Average age sampled by imaginary seismic data set

Age  domain size  seismic properties

Model explains the Vp hemispheres!

1 elasticity model fits, 5 do not

Tuned parameter #2: Domains grow to ~ λ seismic /2π Calvet and Margerin, 2008

Q from model < observed Q

Other seismic features Inner inner core? EastWest Modified from a figure by Jessica Irving

Future tests Try to explain innermost inner core with a textured polycrystalline scattering model Test a spectrum of iron elasticity models Map Vp in different frequency bins Map Q Conclusion: Rigid translation is consistent with observed hemispherical variation in Vp provided that: (1) domains grow to approximately λ Seismic /2π, (2) the iron alloy making up the inner core has relatively high elastic anisotropy