Geophysics: Inner core differential motion confirmed by earthquake waveform doublets

Jian Zhang; Xiaodong Song; Yingchun Li; Paul C. Richards; Xinlei Sun; Felix Waldhauser

doi:10.1126/science.1113193

Geophysics: Inner core differential motion confirmed by earthquake waveform doublets

Jian Zhang, Xiaodong Song, Yingchun Li, Paul C. Richards, Xinlei Sun, Felix Waldhauser

Earth Science and Environmental Change

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

Abstract

We analyzed 18 high-quality waveform doublets with time separations of up to 35 years in the South Sandwich Islands region, for which the seismic signals have traversed the inner core as PKP(DF). The doublets show a consistent temporal change of travel times at up to 58 stations in and near Alaska, and they show a dissimilarity of PKP(DF) coda. Using waveform doublets avoids artifacts of earthquake mislocations and contamination from small-scale heterogeneities. Our results confirm that Earth's inner core is rotating faster than the mantle and crust at about 0.3° to 0.5° per year.

Original language	English (US)
Pages (from-to)	1357-1360
Number of pages	4
Journal	Science
Volume	309
Issue number	5739
DOIs	https://doi.org/10.1126/science.1113193
State	Published - Aug 26 2005

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title = "Geophysics: Inner core differential motion confirmed by earthquake waveform doublets",

abstract = "We analyzed 18 high-quality waveform doublets with time separations of up to 35 years in the South Sandwich Islands region, for which the seismic signals have traversed the inner core as PKP(DF). The doublets show a consistent temporal change of travel times at up to 58 stations in and near Alaska, and they show a dissimilarity of PKP(DF) coda. Using waveform doublets avoids artifacts of earthquake mislocations and contamination from small-scale heterogeneities. Our results confirm that Earth's inner core is rotating faster than the mantle and crust at about 0.3° to 0.5° per year.",

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T2 - Inner core differential motion confirmed by earthquake waveform doublets

AU - Zhang, Jian

AU - Song, Xiaodong

AU - Li, Yingchun

AU - Richards, Paul C.

AU - Sun, Xinlei

AU - Waldhauser, Felix

PY - 2005/8/26

Y1 - 2005/8/26

N2 - We analyzed 18 high-quality waveform doublets with time separations of up to 35 years in the South Sandwich Islands region, for which the seismic signals have traversed the inner core as PKP(DF). The doublets show a consistent temporal change of travel times at up to 58 stations in and near Alaska, and they show a dissimilarity of PKP(DF) coda. Using waveform doublets avoids artifacts of earthquake mislocations and contamination from small-scale heterogeneities. Our results confirm that Earth's inner core is rotating faster than the mantle and crust at about 0.3° to 0.5° per year.

AB - We analyzed 18 high-quality waveform doublets with time separations of up to 35 years in the South Sandwich Islands region, for which the seismic signals have traversed the inner core as PKP(DF). The doublets show a consistent temporal change of travel times at up to 58 stations in and near Alaska, and they show a dissimilarity of PKP(DF) coda. Using waveform doublets avoids artifacts of earthquake mislocations and contamination from small-scale heterogeneities. Our results confirm that Earth's inner core is rotating faster than the mantle and crust at about 0.3° to 0.5° per year.

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Geophysics: Inner core differential motion confirmed by earthquake waveform doublets

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