A new catalogue of normal-mode splitting function measurements up to 10 mHz

Arwen Deuss; Jeroen Ritsema; Hendrik van Heijst

doi:10.1093/gji/ggt010

A new catalogue of normal-mode splitting function measurements up to 10 mHz

Arwen Deuss^*, Jeroen Ritsema, Hendrik van Heijst

^*Corresponding author for this work

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Abstract

The splitting of the Earth's free-oscillation spectra places important constraints on the wave speed and density structure of the Earth's mantle and core. We present a new set of 164 self-coupled and 32 cross-coupled splitting functions. They are derived from modal spectra up to 10 mHz for 91 events with M-w >= 7.4 from the last 34 yr (1976-2010). Our data include the 2001 June 23 Peru event (M-w = 8.4), the Sumatra events of 2004 (M-w = 9.0) and 2005 (M-w = 8.6), the 2008 Wenchuan, China event (M-w = 7.9) and the 2010 Chile event (M-w = 8.8). The new events provide significant improvement of data coverage particularly in continental areas. Almost half of the splitting functions have never been measured before. In particular, we measured 33 new modes sensitive to mantle compressional wave velocity, 10 new inner-core sensitive modes and 22 new cross-coupled splitting functions. These provide new constraints on the large-scale compressional structure of the mantle and the odd-degree structure of the mantle and inner core and can be used in future inversions of heterogeneous Earth structure. Our new splitting function coefficient data set will be available online.

Original language	English
Pages (from-to)	920-937
Number of pages	18
Journal	Geophysical Journal International
Volume	193
Issue number	2
DOIs	https://doi.org/10.1093/gji/ggt010
Publication status	Published - May 2013

Funding

AD has been funded by the European Research Council under the European Community's Seventh Framework programme (FP7/2007-2013)/ERC grant agreement 204995 and by a Philip Leverhulme Prize. JR is supported by NSF grant EAR-0944167. We thank Mike Ritzwoller, Gabi Laske and an anonymous reviewer for constructive comments which helped to improve the manuscript. The facilities of the IRIS Data Management System, and specifically the IRIS Data Management Center, were used for access to waveform and metadata required in this study. We also acknowledge use of the 'Global CMT project' webpage for the earthquake source parameters used in this study.

Keywords

Surface waves and free oscillations
Seismic anisotropy
Seismic tomography
Mantle processes
Core
outer core and inner core
INNER-CORE ANISOTROPY
FREE-OSCILLATION SPECTRA
SHEAR-VELOCITY MODEL
PERIOD NORMAL-MODES
ASPHERICAL STRUCTURE
LOWER MANTLE
WAVE VELOCITY
EARTHS MANTLE
CONSTRAINTS
DENSITY

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10.1093/gji/ggt010

Cite this

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title = "A new catalogue of normal-mode splitting function measurements up to 10 mHz",

abstract = "The splitting of the Earth's free-oscillation spectra places important constraints on the wave speed and density structure of the Earth's mantle and core. We present a new set of 164 self-coupled and 32 cross-coupled splitting functions. They are derived from modal spectra up to 10 mHz for 91 events with M-w >= 7.4 from the last 34 yr (1976-2010). Our data include the 2001 June 23 Peru event (M-w = 8.4), the Sumatra events of 2004 (M-w = 9.0) and 2005 (M-w = 8.6), the 2008 Wenchuan, China event (M-w = 7.9) and the 2010 Chile event (M-w = 8.8). The new events provide significant improvement of data coverage particularly in continental areas. Almost half of the splitting functions have never been measured before. In particular, we measured 33 new modes sensitive to mantle compressional wave velocity, 10 new inner-core sensitive modes and 22 new cross-coupled splitting functions. These provide new constraints on the large-scale compressional structure of the mantle and the odd-degree structure of the mantle and inner core and can be used in future inversions of heterogeneous Earth structure. Our new splitting function coefficient data set will be available online.",

keywords = "Surface waves and free oscillations, Seismic anisotropy, Seismic tomography, Mantle processes, Core, outer core and inner core, INNER-CORE ANISOTROPY, FREE-OSCILLATION SPECTRA, SHEAR-VELOCITY MODEL, PERIOD NORMAL-MODES, ASPHERICAL STRUCTURE, LOWER MANTLE, WAVE VELOCITY, EARTHS MANTLE, CONSTRAINTS, DENSITY",

author = "Arwen Deuss and Jeroen Ritsema and \{van Heijst\}, Hendrik",

year = "2013",

month = may,

doi = "10.1093/gji/ggt010",

language = "English",

volume = "193",

pages = "920--937",

journal = "Geophysical Journal International",

issn = "0956-540X",

publisher = "Oxford University Press",

number = "2",

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T1 - A new catalogue of normal-mode splitting function measurements up to 10 mHz

AU - Deuss, Arwen

AU - Ritsema, Jeroen

AU - van Heijst, Hendrik

PY - 2013/5

Y1 - 2013/5

N2 - The splitting of the Earth's free-oscillation spectra places important constraints on the wave speed and density structure of the Earth's mantle and core. We present a new set of 164 self-coupled and 32 cross-coupled splitting functions. They are derived from modal spectra up to 10 mHz for 91 events with M-w >= 7.4 from the last 34 yr (1976-2010). Our data include the 2001 June 23 Peru event (M-w = 8.4), the Sumatra events of 2004 (M-w = 9.0) and 2005 (M-w = 8.6), the 2008 Wenchuan, China event (M-w = 7.9) and the 2010 Chile event (M-w = 8.8). The new events provide significant improvement of data coverage particularly in continental areas. Almost half of the splitting functions have never been measured before. In particular, we measured 33 new modes sensitive to mantle compressional wave velocity, 10 new inner-core sensitive modes and 22 new cross-coupled splitting functions. These provide new constraints on the large-scale compressional structure of the mantle and the odd-degree structure of the mantle and inner core and can be used in future inversions of heterogeneous Earth structure. Our new splitting function coefficient data set will be available online.

AB - The splitting of the Earth's free-oscillation spectra places important constraints on the wave speed and density structure of the Earth's mantle and core. We present a new set of 164 self-coupled and 32 cross-coupled splitting functions. They are derived from modal spectra up to 10 mHz for 91 events with M-w >= 7.4 from the last 34 yr (1976-2010). Our data include the 2001 June 23 Peru event (M-w = 8.4), the Sumatra events of 2004 (M-w = 9.0) and 2005 (M-w = 8.6), the 2008 Wenchuan, China event (M-w = 7.9) and the 2010 Chile event (M-w = 8.8). The new events provide significant improvement of data coverage particularly in continental areas. Almost half of the splitting functions have never been measured before. In particular, we measured 33 new modes sensitive to mantle compressional wave velocity, 10 new inner-core sensitive modes and 22 new cross-coupled splitting functions. These provide new constraints on the large-scale compressional structure of the mantle and the odd-degree structure of the mantle and inner core and can be used in future inversions of heterogeneous Earth structure. Our new splitting function coefficient data set will be available online.

KW - Surface waves and free oscillations

KW - Seismic anisotropy

KW - Seismic tomography

KW - Mantle processes

KW - Core

KW - outer core and inner core

KW - INNER-CORE ANISOTROPY

KW - FREE-OSCILLATION SPECTRA

KW - SHEAR-VELOCITY MODEL

KW - PERIOD NORMAL-MODES

KW - ASPHERICAL STRUCTURE

KW - LOWER MANTLE

KW - WAVE VELOCITY

KW - EARTHS MANTLE

KW - CONSTRAINTS

KW - DENSITY

U2 - 10.1093/gji/ggt010

DO - 10.1093/gji/ggt010

M3 - Article

SN - 0956-540X

VL - 193

SP - 920

EP - 937

JO - Geophysical Journal International

JF - Geophysical Journal International

IS - 2

ER -

A new catalogue of normal-mode splitting function measurements up to 10 mHz

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