www.elsevier.com/locate/epsl Inner core rotation from event-pair analysis
The last decade has witnessed an animated debate on whether the inner core rotation is a fact or an artifact. Here we examine the temporal change of inner core waves using a technique that compares differential travel times at the same station but between two events. The method does not require prec...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.210.6564 2023-05-15T18:23:34+02:00 www.elsevier.com/locate/epsl Inner core rotation from event-pair analysis Xiaodong Song A Georges Poupinet The Pennsylvania State University CiteSeerX Archives 2007 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.210.6564 http://www.geology.illinois.edu/people/xsong/Sites/papers/song_poupinet07_epsl.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.210.6564 http://www.geology.illinois.edu/people/xsong/Sites/papers/song_poupinet07_epsl.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geology.illinois.edu/people/xsong/Sites/papers/song_poupinet07_epsl.pdf inner core rotation PKP differential times bootstrap text 2007 ftciteseerx 2016-01-07T17:50:29Z The last decade has witnessed an animated debate on whether the inner core rotation is a fact or an artifact. Here we examine the temporal change of inner core waves using a technique that compares differential travel times at the same station but between two events. The method does not require precise knowledge of earthquake locations and earth models. The pairing of the events creates a large data set for the application of statistical tools. Using measurements from 87 events in the South Sandwich Islands recorded at College, Alaska station, we conclude the temporal change is robust. The estimates of the temporal change range from about 0.07 to 0.10 s/decade over the past 50 yr. If we used only pairs with small inter-event distances, which reduce the influence of mantle heterogeneity, the rates range from 0.084 to 0.098 s/decade, nearly identical to the rate inferred by Zhang et al. [Zhang, J., Song, X.D., Li, Y.C., Richards, P.G., Sun, X.L., Waldhauser, F., Inner core differential motion confirmed by earthquake waveform doublets, Science 309 (5739) (2005) 1357–1360.] from waveform doublets. The rate of the DF change seems to change with time, which may be explained by lateral variation of the inner core structure or the change in rotation rate on decadal time scale. © 2007 Elsevier B.V. All rights reserved. Text South Sandwich Islands Alaska Unknown Doublets ENVELOPE(98.667,98.667,-66.417,-66.417) Doublets The ENVELOPE(98.667,98.667,-66.417,-66.417) Sandwich Islands South Sandwich Islands |
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English |
topic |
inner core rotation PKP differential times bootstrap |
spellingShingle |
inner core rotation PKP differential times bootstrap Xiaodong Song A Georges Poupinet www.elsevier.com/locate/epsl Inner core rotation from event-pair analysis |
topic_facet |
inner core rotation PKP differential times bootstrap |
description |
The last decade has witnessed an animated debate on whether the inner core rotation is a fact or an artifact. Here we examine the temporal change of inner core waves using a technique that compares differential travel times at the same station but between two events. The method does not require precise knowledge of earthquake locations and earth models. The pairing of the events creates a large data set for the application of statistical tools. Using measurements from 87 events in the South Sandwich Islands recorded at College, Alaska station, we conclude the temporal change is robust. The estimates of the temporal change range from about 0.07 to 0.10 s/decade over the past 50 yr. If we used only pairs with small inter-event distances, which reduce the influence of mantle heterogeneity, the rates range from 0.084 to 0.098 s/decade, nearly identical to the rate inferred by Zhang et al. [Zhang, J., Song, X.D., Li, Y.C., Richards, P.G., Sun, X.L., Waldhauser, F., Inner core differential motion confirmed by earthquake waveform doublets, Science 309 (5739) (2005) 1357–1360.] from waveform doublets. The rate of the DF change seems to change with time, which may be explained by lateral variation of the inner core structure or the change in rotation rate on decadal time scale. © 2007 Elsevier B.V. All rights reserved. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Xiaodong Song A Georges Poupinet |
author_facet |
Xiaodong Song A Georges Poupinet |
author_sort |
Xiaodong Song A |
title |
www.elsevier.com/locate/epsl Inner core rotation from event-pair analysis |
title_short |
www.elsevier.com/locate/epsl Inner core rotation from event-pair analysis |
title_full |
www.elsevier.com/locate/epsl Inner core rotation from event-pair analysis |
title_fullStr |
www.elsevier.com/locate/epsl Inner core rotation from event-pair analysis |
title_full_unstemmed |
www.elsevier.com/locate/epsl Inner core rotation from event-pair analysis |
title_sort |
www.elsevier.com/locate/epsl inner core rotation from event-pair analysis |
publishDate |
2007 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.210.6564 http://www.geology.illinois.edu/people/xsong/Sites/papers/song_poupinet07_epsl.pdf |
long_lat |
ENVELOPE(98.667,98.667,-66.417,-66.417) ENVELOPE(98.667,98.667,-66.417,-66.417) |
geographic |
Doublets Doublets The Sandwich Islands South Sandwich Islands |
geographic_facet |
Doublets Doublets The Sandwich Islands South Sandwich Islands |
genre |
South Sandwich Islands Alaska |
genre_facet |
South Sandwich Islands Alaska |
op_source |
http://www.geology.illinois.edu/people/xsong/Sites/papers/song_poupinet07_epsl.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.210.6564 http://www.geology.illinois.edu/people/xsong/Sites/papers/song_poupinet07_epsl.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766203589659721728 |