Observations of core‐mantle boundary Stoneley modes

Paula Koelemeijer; Arwen Deuss; Jeroen Ritsema

doi:10.1002/grl.50514

Observations of core‐mantle boundary Stoneley modes

Paula Koelemeijer, Arwen Deuss, Jeroen Ritsema

Department of Earth Sciences

Research output: Contribution to journal › Article › peer-review

Abstract

Core-mantle boundary (CMB) Stoneley modes represent a unique class of normal modes with extremely strong sensitivity to wave speed and density variations in the D" region. We measure splitting functions of eight CMB Stoneley modes using modal spectra from 93 events with M_w> 7.4 between 1976 and 2011. The obtained splitting function maps correlate well with the predicted splitting calculated for S20RTS+Crust5.1 structure and the distribution of S_diff and P_diff travel time anomalies, suggesting that they are robust. We illustrate how our new CMB Stoneley mode splitting functions can be used to estimate density variations in the Earth's lowermost mantle.

Original language	English
Pages (from-to)	2557-2561
Number of pages	5
Journal	Geophysical Research Letters
Volume	40
Issue number	11
Early online date	1 May 2013
DOIs	https://doi.org/10.1002/grl.50514
Publication status	Published - 16 Jun 2013

Keywords

core-mantle boundary
lowermost mantle
normal modes
splitting functions
Stoneley modes

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10.1002/grl.50514

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AU - Deuss, Arwen

AU - Ritsema, Jeroen

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N2 - Core-mantle boundary (CMB) Stoneley modes represent a unique class of normal modes with extremely strong sensitivity to wave speed and density variations in the D" region. We measure splitting functions of eight CMB Stoneley modes using modal spectra from 93 events with Mw> 7.4 between 1976 and 2011. The obtained splitting function maps correlate well with the predicted splitting calculated for S20RTS+Crust5.1 structure and the distribution of Sdiff and Pdiff travel time anomalies, suggesting that they are robust. We illustrate how our new CMB Stoneley mode splitting functions can be used to estimate density variations in the Earth's lowermost mantle.

AB - Core-mantle boundary (CMB) Stoneley modes represent a unique class of normal modes with extremely strong sensitivity to wave speed and density variations in the D" region. We measure splitting functions of eight CMB Stoneley modes using modal spectra from 93 events with Mw> 7.4 between 1976 and 2011. The obtained splitting function maps correlate well with the predicted splitting calculated for S20RTS+Crust5.1 structure and the distribution of Sdiff and Pdiff travel time anomalies, suggesting that they are robust. We illustrate how our new CMB Stoneley mode splitting functions can be used to estimate density variations in the Earth's lowermost mantle.

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Observations of core‐mantle boundary Stoneley modes

Abstract

Keywords

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