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

^*Corresponding author for this work

non-UU output of UU-AW members

University of Cambridge

Research output: Contribution to journal › Article › Academic › 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
DOIs	https://doi.org/10.1002/grl.50514
Publication status	Published - 16 Jun 2013

Keywords

normal modes
splitting functions
Stoneley modes
core-mantle boundary
lowermost mantle
BENEATH AFRICA
EARTHS MANTLE
DENSITY
VELOCITY
HETEROGENEITY
CONSTRAINTS
TOMOGRAPHY
WAVE
MHZ

Access to Document

10.1002/grl.50514

Cite this

@article{d4dda06e60e04169b92440d91369c982,

title = "Observations of core-mantle boundary Stoneley modes",

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.",

keywords = "normal modes, splitting functions, Stoneley modes, core-mantle boundary, lowermost mantle, BENEATH AFRICA, EARTHS MANTLE, DENSITY, VELOCITY, HETEROGENEITY, CONSTRAINTS, TOMOGRAPHY, WAVE, MHZ",

author = "Paula Koelemeijer and Arwen Deuss and Jeroen Ritsema",

year = "2013",

month = jun,

day = "16",

doi = "10.1002/grl.50514",

language = "English",

volume = "40",

pages = "2557--2561",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "Wiley Online Library",

number = "11",

}

TY - JOUR

T1 - Observations of core-mantle boundary Stoneley modes

AU - Koelemeijer, Paula

AU - Deuss, Arwen

AU - Ritsema, Jeroen

PY - 2013/6/16

Y1 - 2013/6/16

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 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.

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 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.

KW - normal modes

KW - splitting functions

KW - Stoneley modes

KW - core-mantle boundary

KW - lowermost mantle

KW - BENEATH AFRICA

KW - EARTHS MANTLE

KW - DENSITY

KW - VELOCITY

KW - HETEROGENEITY

KW - CONSTRAINTS

KW - TOMOGRAPHY

KW - WAVE

KW - MHZ

U2 - 10.1002/grl.50514

DO - 10.1002/grl.50514

M3 - Article

SN - 0094-8276

VL - 40

SP - 2557

EP - 2561

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 11

ER -

Observations of core-mantle boundary Stoneley modes

Abstract

Keywords

Access to Document

Fingerprint

Cite this