Variations in shear-wave splitting in young Pacific seafloor
Variations in shear-wave splitting in young Pacific seafloor
Analysis of SKS phases recorded by ocean-bottom seismometers in the GLIMPSE Experiment has expanded the region of in situ measurements of shear-wave splitting in young seafloor near the southern East Pacific Rise. Average splitting times at individual GLIMPSE sites range from 1.1 to 2.2 s with fast direction azimuths trending approximately in the direction of absolute plate motion and fossil spreading for the Pacific plate. The GLIMPSE study area at 12 to 14°S is adjacent to the MELT Experiment. The new observations demonstrate that splitting delays are not uniform on the Pacific plate and that the contrast between the Nazca and Pacific plates is not a fundamental consequence of the asymmetric plate motion. The variations in degree of splitting could be caused by small-scale convection, variations in water content, or rate of deformation in the asthenospheric return flow to the East Pacific Rise.
L15609
Harmon, Nicholas
10d11a16-b8b0-4132-9354-652e72d8e830
Forsyth, Donald W.
9a82b182-42c0-4799-acf9-bf513c11ea0f
Fischer, Karen M.
5acb751d-c894-4a40-b944-cea48b0ad966
Webb, Spahr C.
93217a52-e287-472f-a6ee-d5cc6b95862c
6 August 2004
Harmon, Nicholas
10d11a16-b8b0-4132-9354-652e72d8e830
Forsyth, Donald W.
9a82b182-42c0-4799-acf9-bf513c11ea0f
Fischer, Karen M.
5acb751d-c894-4a40-b944-cea48b0ad966
Webb, Spahr C.
93217a52-e287-472f-a6ee-d5cc6b95862c
Harmon, Nicholas, Forsyth, Donald W., Fischer, Karen M. and Webb, Spahr C.
(2004)
Variations in shear-wave splitting in young Pacific seafloor.
Geophysical Research Letters, 31, .
(doi:10.1029/2004GL020495).
Abstract
Analysis of SKS phases recorded by ocean-bottom seismometers in the GLIMPSE Experiment has expanded the region of in situ measurements of shear-wave splitting in young seafloor near the southern East Pacific Rise. Average splitting times at individual GLIMPSE sites range from 1.1 to 2.2 s with fast direction azimuths trending approximately in the direction of absolute plate motion and fossil spreading for the Pacific plate. The GLIMPSE study area at 12 to 14°S is adjacent to the MELT Experiment. The new observations demonstrate that splitting delays are not uniform on the Pacific plate and that the contrast between the Nazca and Pacific plates is not a fundamental consequence of the asymmetric plate motion. The variations in degree of splitting could be caused by small-scale convection, variations in water content, or rate of deformation in the asthenospheric return flow to the East Pacific Rise.
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Published date: 6 August 2004
Organisations:
Ocean and Earth Science
Identifiers
Local EPrints ID: 66062
URI: http://eprints.soton.ac.uk/id/eprint/66062
ISSN: 0094-8276
PURE UUID: 0d5580e0-6e8f-4115-a784-71ad76f6eb64
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Date deposited: 27 Apr 2009
Last modified: 14 Mar 2024 02:55
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Author:
Donald W. Forsyth
Author:
Karen M. Fischer
Author:
Spahr C. Webb
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