Attenuation tomography of the upper inner core
Date
2017
Authors
Pejic, Tanja
Tkalčić, Hrvoje
Sambridge, Malcolm
Cormier, Vernon F.
Benavente, Roberto
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley Blackwell
Abstract
The solidification of the Earth's inner core shapes its texture and rheology, affecting the attenuation and scattering of seismic body waves transmitted through it. Applying attenuation tomography in a Bayesian framework to 398 high-quality PKIKP waveforms, we invert for the apparent Qp for the uppermost 400 km below the inner core boundary at latitudes 45°S to 45°N. We use damping and smoothing for regularization of the inversion, and it seems that the smoothing regularization combined with the discrepancy principle works better for this particular problem of attenuation tomography. The results are consistent with a regional variation in inner core attenuation more complex than hemispherical, suggesting coupling between inner core solidification and the thermal structure of the lowermost mantle
Description
Keywords
Citation
Collections
Source
Journal of Geophysical Research: Solid Earth
Type
Journal article
Book Title
Entity type
Access Statement
Open Access