Global seismic body‐wave observations of temporal variations in the Earth's inner core, and implications for its differential rotation
Differential rotation of the Earth's inner core has been predicted in some geodynamo models, and seismic studies over the past 15 yr have resolved rotation rates up to 1° yr−1. Most previous seismic body-wave studies have focussed on South Sandwich Islands events recorded at station COL in Alas...
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:2189 2023-05-15T18:23:33+02:00 Global seismic body‐wave observations of temporal variations in the Earth's inner core, and implications for its differential rotation Mäkinen, Anna M Deuss, Arwen 2011-08 application/pdf http://eprints.esc.cam.ac.uk/2189/ http://eprints.esc.cam.ac.uk/2189/1/Makinen_Deuss_j.1365-246X.2011.05146.x.pdf http://onlinelibrary.wiley.com/doi/10.1111/j.1365-246X.2011.05146.x/abstract en eng http://eprints.esc.cam.ac.uk/2189/1/Makinen_Deuss_j.1365-246X.2011.05146.x.pdf Mäkinen, Anna M and Deuss, Arwen (2011) Global seismic body‐wave observations of temporal variations in the Earth's inner core, and implications for its differential rotation. Geophysical Journal International, 181 (1). pp. 355-370. DOI https://doi.org/10.1111/j.1365-246X.2011.05146.x <https://doi.org/10.1111/j.1365-246X.2011.05146.x> 02 - Geodynamics Geophysics and Tectonics Article PeerReviewed 2011 ftucambridgeesc https://doi.org/10.1111/j.1365-246X.2011.05146.x 2020-08-27T18:09:11Z Differential rotation of the Earth's inner core has been predicted in some geodynamo models, and seismic studies over the past 15 yr have resolved rotation rates up to 1° yr−1. Most previous seismic body-wave studies have focussed on South Sandwich Islands events recorded at station COL in Alaska. Here, we present a globally extended study into temporal variations in the inner core over some 25 yr, using PKPbc-PKPdf traveltime residuals. To test for differential rotation of the inner core, displacement of inner-core heterogeneities over time is sought. We introduce a new method of space-flattening to remove the effect of spatial variations on the time variations; this allows for the use of both polar, semi-equatorial and equatorial geometries. First, we reanalyse polar paths from South Sandwich Islands events to stations COL and INK in North America. These stations yield a differential rotation of the inner core at a rate of 0.12–0.38° yr−1 in an eastward direction, in agreement with previous studies. However, station DAWY, which has a very similar path through the inner core as COL, yields at best a westward differential rotation of the inner core. Thus DAWY results are incompatible with the COL/INK inferred rotation. Secondly, earthquakes in the Aleutian Islands region, observed at BOSA and LBTB in southern Africa, exhibit temporal variations that are incompatible with the South Sandwich Islands-COL/INK inferred rotation rate. Thirdly, Kuril Islands events, recorded in South America at station BDF, yield inconclusive results. Finally, our final piece of evidence for the irreconcilability of differential inner-core rotation with global data comes from using earthquakes in the Vanuatu region, recorded at BCAO/BGCA in Central Africa, an equatorial geometry. These residuals resolve a westward inner-core rotation at a rate of 0.14° yr−1, over the same time period that South Sandwich Islands events indicate an eastward rotation. As any rigid-body rotation should yield the same direction and rate independent of where the inner core is sampled, our results allow us to reject previously reported inner-core differential rotation rates of up to 0.1–0.5° yr−1. Instead, our results suggest that structure in either the inner or the outer core is varying with time, over relatively short timescales and in ways that cannot be explained by, and do not support, a differentially rotating inner core. Article in Journal/Newspaper South Sandwich Islands Alaska Aleutian Islands University of Cambridge, Department of Earth Sciences: ESC Publications Sandwich Islands South Sandwich Islands Geophysical Journal International 187 1 355 370 |
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Open Polar |
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University of Cambridge, Department of Earth Sciences: ESC Publications |
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ftucambridgeesc |
language |
English |
topic |
02 - Geodynamics Geophysics and Tectonics |
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02 - Geodynamics Geophysics and Tectonics Mäkinen, Anna M Deuss, Arwen Global seismic body‐wave observations of temporal variations in the Earth's inner core, and implications for its differential rotation |
topic_facet |
02 - Geodynamics Geophysics and Tectonics |
description |
Differential rotation of the Earth's inner core has been predicted in some geodynamo models, and seismic studies over the past 15 yr have resolved rotation rates up to 1° yr−1. Most previous seismic body-wave studies have focussed on South Sandwich Islands events recorded at station COL in Alaska. Here, we present a globally extended study into temporal variations in the inner core over some 25 yr, using PKPbc-PKPdf traveltime residuals. To test for differential rotation of the inner core, displacement of inner-core heterogeneities over time is sought. We introduce a new method of space-flattening to remove the effect of spatial variations on the time variations; this allows for the use of both polar, semi-equatorial and equatorial geometries. First, we reanalyse polar paths from South Sandwich Islands events to stations COL and INK in North America. These stations yield a differential rotation of the inner core at a rate of 0.12–0.38° yr−1 in an eastward direction, in agreement with previous studies. However, station DAWY, which has a very similar path through the inner core as COL, yields at best a westward differential rotation of the inner core. Thus DAWY results are incompatible with the COL/INK inferred rotation. Secondly, earthquakes in the Aleutian Islands region, observed at BOSA and LBTB in southern Africa, exhibit temporal variations that are incompatible with the South Sandwich Islands-COL/INK inferred rotation rate. Thirdly, Kuril Islands events, recorded in South America at station BDF, yield inconclusive results. Finally, our final piece of evidence for the irreconcilability of differential inner-core rotation with global data comes from using earthquakes in the Vanuatu region, recorded at BCAO/BGCA in Central Africa, an equatorial geometry. These residuals resolve a westward inner-core rotation at a rate of 0.14° yr−1, over the same time period that South Sandwich Islands events indicate an eastward rotation. As any rigid-body rotation should yield the same direction and rate independent of where the inner core is sampled, our results allow us to reject previously reported inner-core differential rotation rates of up to 0.1–0.5° yr−1. Instead, our results suggest that structure in either the inner or the outer core is varying with time, over relatively short timescales and in ways that cannot be explained by, and do not support, a differentially rotating inner core. |
format |
Article in Journal/Newspaper |
author |
Mäkinen, Anna M Deuss, Arwen |
author_facet |
Mäkinen, Anna M Deuss, Arwen |
author_sort |
Mäkinen, Anna M |
title |
Global seismic body‐wave observations of temporal variations in the Earth's inner core, and implications for its differential rotation |
title_short |
Global seismic body‐wave observations of temporal variations in the Earth's inner core, and implications for its differential rotation |
title_full |
Global seismic body‐wave observations of temporal variations in the Earth's inner core, and implications for its differential rotation |
title_fullStr |
Global seismic body‐wave observations of temporal variations in the Earth's inner core, and implications for its differential rotation |
title_full_unstemmed |
Global seismic body‐wave observations of temporal variations in the Earth's inner core, and implications for its differential rotation |
title_sort |
global seismic body‐wave observations of temporal variations in the earth's inner core, and implications for its differential rotation |
publishDate |
2011 |
url |
http://eprints.esc.cam.ac.uk/2189/ http://eprints.esc.cam.ac.uk/2189/1/Makinen_Deuss_j.1365-246X.2011.05146.x.pdf http://onlinelibrary.wiley.com/doi/10.1111/j.1365-246X.2011.05146.x/abstract |
geographic |
Sandwich Islands South Sandwich Islands |
geographic_facet |
Sandwich Islands South Sandwich Islands |
genre |
South Sandwich Islands Alaska Aleutian Islands |
genre_facet |
South Sandwich Islands Alaska Aleutian Islands |
op_relation |
http://eprints.esc.cam.ac.uk/2189/1/Makinen_Deuss_j.1365-246X.2011.05146.x.pdf Mäkinen, Anna M and Deuss, Arwen (2011) Global seismic body‐wave observations of temporal variations in the Earth's inner core, and implications for its differential rotation. Geophysical Journal International, 181 (1). pp. 355-370. DOI https://doi.org/10.1111/j.1365-246X.2011.05146.x <https://doi.org/10.1111/j.1365-246X.2011.05146.x> |
op_doi |
https://doi.org/10.1111/j.1365-246X.2011.05146.x |
container_title |
Geophysical Journal International |
container_volume |
187 |
container_issue |
1 |
container_start_page |
355 |
op_container_end_page |
370 |
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1766203570340757504 |