A comparison of the upper-mantle structure beneath Eurasia and the North Atlantic and Arctic Oceans
A travel-time curve for P seismic waves recorded at NORSAR from earthquakes in the North Atlantic and Arctic Oceans is of a significantly different character from those for rays bottoming under western Russia and southeast and central Europe. The differences arise principally from variations in the...
Published in: | Geophysical Journal International |
---|---|
Main Authors: | , , |
Format: | Text |
Language: | English |
Published: |
Oxford University Press
1978
|
Subjects: | |
Online Access: | http://gji.oxfordjournals.org/cgi/content/short/54/3/575 https://doi.org/10.1111/j.1365-246X.1978.tb05495.x |
id |
fthighwire:oai:open-archive.highwire.org:gji:54/3/575 |
---|---|
record_format |
openpolar |
spelling |
fthighwire:oai:open-archive.highwire.org:gji:54/3/575 2023-05-15T14:57:12+02:00 A comparison of the upper-mantle structure beneath Eurasia and the North Atlantic and Arctic Oceans England, P. C. Kennett, B. L. N. Worthington, M. H. 1978-09-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/54/3/575 https://doi.org/10.1111/j.1365-246X.1978.tb05495.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/54/3/575 http://dx.doi.org/10.1111/j.1365-246X.1978.tb05495.x Copyright (C) 1978, Oxford University Press Articles TEXT 1978 fthighwire https://doi.org/10.1111/j.1365-246X.1978.tb05495.x 2013-05-26T22:39:22Z A travel-time curve for P seismic waves recorded at NORSAR from earthquakes in the North Atlantic and Arctic Oceans is of a significantly different character from those for rays bottoming under western Russia and southeast and central Europe. The differences arise principally from variations in the outer 200-300 km of the three regions and from the apparently anomalous nature of the velocity distribution between 300 and 500km beneath southern and central Europe. Extremal ‘tau’ inversion is extended to the calculation of bounds on vertical transit time for different depth ranges beneath the three regions. A maximum difference of 5 s is permitted by the bounds in the two-way vertical transit times of P waves between 50 and 800 km below western Russia and the oceans. The bounds obtained on transit times between 300 and 800 km demand no significant difference between the two regions and permit a maximum difference of 2.5 s in two-way transit time. This is consistent with the observation that the oceanic travel-time curve may be fitted to within observational error by a model which is substantially the same as that for western Russia below 300 km. Text Arctic North Atlantic HighWire Press (Stanford University) Arctic Geophysical Journal International 54 3 575 585 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Articles |
spellingShingle |
Articles England, P. C. Kennett, B. L. N. Worthington, M. H. A comparison of the upper-mantle structure beneath Eurasia and the North Atlantic and Arctic Oceans |
topic_facet |
Articles |
description |
A travel-time curve for P seismic waves recorded at NORSAR from earthquakes in the North Atlantic and Arctic Oceans is of a significantly different character from those for rays bottoming under western Russia and southeast and central Europe. The differences arise principally from variations in the outer 200-300 km of the three regions and from the apparently anomalous nature of the velocity distribution between 300 and 500km beneath southern and central Europe. Extremal ‘tau’ inversion is extended to the calculation of bounds on vertical transit time for different depth ranges beneath the three regions. A maximum difference of 5 s is permitted by the bounds in the two-way vertical transit times of P waves between 50 and 800 km below western Russia and the oceans. The bounds obtained on transit times between 300 and 800 km demand no significant difference between the two regions and permit a maximum difference of 2.5 s in two-way transit time. This is consistent with the observation that the oceanic travel-time curve may be fitted to within observational error by a model which is substantially the same as that for western Russia below 300 km. |
format |
Text |
author |
England, P. C. Kennett, B. L. N. Worthington, M. H. |
author_facet |
England, P. C. Kennett, B. L. N. Worthington, M. H. |
author_sort |
England, P. C. |
title |
A comparison of the upper-mantle structure beneath Eurasia and the North Atlantic and Arctic Oceans |
title_short |
A comparison of the upper-mantle structure beneath Eurasia and the North Atlantic and Arctic Oceans |
title_full |
A comparison of the upper-mantle structure beneath Eurasia and the North Atlantic and Arctic Oceans |
title_fullStr |
A comparison of the upper-mantle structure beneath Eurasia and the North Atlantic and Arctic Oceans |
title_full_unstemmed |
A comparison of the upper-mantle structure beneath Eurasia and the North Atlantic and Arctic Oceans |
title_sort |
comparison of the upper-mantle structure beneath eurasia and the north atlantic and arctic oceans |
publisher |
Oxford University Press |
publishDate |
1978 |
url |
http://gji.oxfordjournals.org/cgi/content/short/54/3/575 https://doi.org/10.1111/j.1365-246X.1978.tb05495.x |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic North Atlantic |
genre_facet |
Arctic North Atlantic |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/54/3/575 http://dx.doi.org/10.1111/j.1365-246X.1978.tb05495.x |
op_rights |
Copyright (C) 1978, Oxford University Press |
op_doi |
https://doi.org/10.1111/j.1365-246X.1978.tb05495.x |
container_title |
Geophysical Journal International |
container_volume |
54 |
container_issue |
3 |
container_start_page |
575 |
op_container_end_page |
585 |
_version_ |
1766329284024074240 |