DOI: 10.1785/bssa0610041051. The velocities in the outer core

10.1785/bssa0610041051

Crossref journal-article

Seismological Society of America (SSA)

Bulletin of the Seismological Society of America (790)

Abstract

abstract Earlier studies of the velocity distribution in the outer core have been based on the travel times of SKS.SKS arrivals can only be observed satisfactorily for arc distances at the surface greater than 85°. This lower limit of observation of SKS corresponds to an arc distance of 40.2° within the core. Thus the velocities in the outermost 250 km of the core are based upon an extrapolation. We have used observations of the difference in time of arrival of SKKS and SKS to obtain core travel times extending the range of observation down to a Δ within the core of about 14°. The velocity distribution thus found is significantly lower than those of Jeffreys (Bullen, 1963) and Randall (in press) near the core mantle boundary.

Bibliography

Hales, A. L., & Roberts, J. L. (1971). The velocities in the outer core. Bulletin of the Seismological Society of America, 61(4), 1051â1059.

Authors 2

A. L. Hales (first)
J. L. Roberts (additional)

References 8 Referenced 54

{'key': '2021091017412151700_BIB1', 'volume-title': 'Seismology', 'author': 'Bullen', 'year': '(1963)'} / Seismology by Bullen ((1963))
Engdahl E. R. (1968). Core phases and the Earth's core, Ph.D. Thesis, St. Louis University, 197 pp.
{'key': '2021091017412151700_BIB3', 'first-page': '1975', 'article-title': 'Velocity distributions in the lower mantle', 'volume': '58', 'author': 'Hales', 'year': '(1968)', 'journal-title': 'Bull. Seism. Soc. Am.'} / Bull. Seism. Soc. Am. / Velocity distributions in the lower mantle by Hales ((1968))
{'key': '2021091017412151700_BIB4', 'article-title': 'Travel times of seismic waves', 'author': 'Hales', 'year': '(1971)'} / Travel times of seismic waves by Hales ((1971))
{'key': '2021091017412151700_BIB5', 'first-page': '461', 'article-title': 'The travel times of S and SKS', 'volume': '60', 'author': 'Hales', 'year': '(1970)', 'journal-title': 'Bull. Seism. Soc. Am.'} / Bull. Seism. Soc. Am. / The travel times of S and SKS by Hales ((1970))
{'key': '2021091017412151700_BIB6', 'first-page': '1427', 'article-title': 'Shear velocities in the lower mantle and the radius of the core', 'volume': '60', 'author': 'Hales', 'year': '(1970)', 'journal-title': 'Bull. Seism. Soc. Am.'} / Bull. Seism. Soc. Am. / Shear velocities in the lower mantle and the radius of the core by Hales ((1970))
{'key': '2021091017412151700_BIB7', 'article-title': 'SKS and seismic velocities in the outer core', 'author': 'Randall', 'year': '(1971)'} / SKS and seismic velocities in the outer core by Randall ((1971))
10.1785/BSSA0580041293 / Bull. Seism. Soc. Am. / Estimation of PcP travel times and the depth to the core by Taggart ((1968))

Dates

Type	When
Created	3 years, 11 months ago (Sept. 10, 2021, 1:41 p.m.)
Deposited	3 years, 11 months ago (Sept. 10, 2021, 1:41 p.m.)
Indexed	1 year, 4 months ago (April 27, 2024, 11:58 a.m.)
Issued	54 years, 1 month ago (Aug. 1, 1971)
Published	54 years, 1 month ago (Aug. 1, 1971)
Published Online	54 years, 1 month ago (Aug. 1, 1971)
Published Print	54 years, 1 month ago (Aug. 1, 1971)

Funders 0

None

BibTeX

@article{Hales_1971, title={The velocities in the outer core}, volume={61}, ISSN={0037-1106}, url={http://dx.doi.org/10.1785/bssa0610041051}, DOI={10.1785/bssa0610041051}, number={4}, journal={Bulletin of the Seismological Society of America}, publisher={Seismological Society of America (SSA)}, author={Hales, A. L. and Roberts, J. L.}, year={1971}, month=aug, pages={1051–1059} }

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