Seismological evidence for a mid-mantle discontinuity beneath Hawaii and Iceland
Receiver functions derived from body waves recorded in Iceland and on the Hawaiian Islands reveal a seismic velocity discontinuity at about 1050 km depth beneath the two regions of presumed mantle upwelling. The waveforms of the converted phases from the mid-mantle discontinuity indicate a velocity...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.544.6884 2023-05-15T16:45:58+02:00 Seismological evidence for a mid-mantle discontinuity beneath Hawaii and Iceland Yang Shen A Cecily J. Wolfe B Sean C. Solomon C The Pennsylvania State University CiteSeerX Archives 2003 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.544.6884 http://www.higp.hawaii.edu/~cecily/shen.epsl.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.544.6884 http://www.higp.hawaii.edu/~cecily/shen.epsl.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.higp.hawaii.edu/~cecily/shen.epsl.pdf mantle discontinuities transition zones mantle composition Iceland Hawaii text 2003 ftciteseerx 2016-01-08T11:14:02Z Receiver functions derived from body waves recorded in Iceland and on the Hawaiian Islands reveal a seismic velocity discontinuity at about 1050 km depth beneath the two regions of presumed mantle upwelling. The waveforms of the converted phases from the mid-mantle discontinuity indicate a velocity increase with depth. The lack of consistent scattering found in recent systematic searches for seismic boundaries in the middle mantle argues against a globally continuous, sub-horizontal mineralogical phase transition near 1000 km depth. The sense of the velocity change at the mid-mantle discontinuity beneath the two hotspots is consistent with geodynamic models in which the mantle has distinct chemical reservoirs and the material beneath the compositional boundary in these areas is more silicon-rich than the overlying mantle, although the possibility of a yet-unknown phase transition particular to mantle plume material cannot be ruled out. Text Iceland Unknown |
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English |
topic |
mantle discontinuities transition zones mantle composition Iceland Hawaii |
spellingShingle |
mantle discontinuities transition zones mantle composition Iceland Hawaii Yang Shen A Cecily J. Wolfe B Sean C. Solomon C Seismological evidence for a mid-mantle discontinuity beneath Hawaii and Iceland |
topic_facet |
mantle discontinuities transition zones mantle composition Iceland Hawaii |
description |
Receiver functions derived from body waves recorded in Iceland and on the Hawaiian Islands reveal a seismic velocity discontinuity at about 1050 km depth beneath the two regions of presumed mantle upwelling. The waveforms of the converted phases from the mid-mantle discontinuity indicate a velocity increase with depth. The lack of consistent scattering found in recent systematic searches for seismic boundaries in the middle mantle argues against a globally continuous, sub-horizontal mineralogical phase transition near 1000 km depth. The sense of the velocity change at the mid-mantle discontinuity beneath the two hotspots is consistent with geodynamic models in which the mantle has distinct chemical reservoirs and the material beneath the compositional boundary in these areas is more silicon-rich than the overlying mantle, although the possibility of a yet-unknown phase transition particular to mantle plume material cannot be ruled out. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Yang Shen A Cecily J. Wolfe B Sean C. Solomon C |
author_facet |
Yang Shen A Cecily J. Wolfe B Sean C. Solomon C |
author_sort |
Yang Shen A |
title |
Seismological evidence for a mid-mantle discontinuity beneath Hawaii and Iceland |
title_short |
Seismological evidence for a mid-mantle discontinuity beneath Hawaii and Iceland |
title_full |
Seismological evidence for a mid-mantle discontinuity beneath Hawaii and Iceland |
title_fullStr |
Seismological evidence for a mid-mantle discontinuity beneath Hawaii and Iceland |
title_full_unstemmed |
Seismological evidence for a mid-mantle discontinuity beneath Hawaii and Iceland |
title_sort |
seismological evidence for a mid-mantle discontinuity beneath hawaii and iceland |
publishDate |
2003 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.544.6884 http://www.higp.hawaii.edu/~cecily/shen.epsl.pdf |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
http://www.higp.hawaii.edu/~cecily/shen.epsl.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.544.6884 http://www.higp.hawaii.edu/~cecily/shen.epsl.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766036112787111936 |