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Global Love wave overtone measurements

Visser, K; Lebedev, S; Trampert, Jeannot; Kennett, Brian

Description

Love wave phase velocities for fundamental and higher models are difficult to measure because the different modes cannot easily be separated. Following Yoshizawa and Kennett (2002), we generate suites of path specific one-dimensional shear wave velocity profiles using the Neighbourhood Algorithm of Sambridge (1999a). From this family of O(104) models both fundamental and higher mode phase velocities with mutually consistent uncertainties are calculated. We have fully automated the method and...[Show more]

dc.contributor.authorVisser, K
dc.contributor.authorLebedev, S
dc.contributor.authorTrampert, Jeannot
dc.contributor.authorKennett, Brian
dc.date.accessioned2015-12-08T22:37:26Z
dc.identifier.issn0094-8276
dc.identifier.urihttp://hdl.handle.net/1885/35520
dc.description.abstractLove wave phase velocities for fundamental and higher models are difficult to measure because the different modes cannot easily be separated. Following Yoshizawa and Kennett (2002), we generate suites of path specific one-dimensional shear wave velocity profiles using the Neighbourhood Algorithm of Sambridge (1999a). From this family of O(104) models both fundamental and higher mode phase velocities with mutually consistent uncertainties are calculated. We have fully automated the method and analysed over forty thousand Love wave seismograms from the GDSN and GEOSCOPE global networks from 1994-2004. Our phase velocity measurements agree remarkably well with previous studies, but we have been able to enlarge the available dataset dramatically. We present global Love wave phase velocity maps (up to the fifth overtone) with unprecedented resolution due to the improved path coverage. Comparing these maps to existing tomographic models, we discern evidence of significant anisotropy in the lower mantle around a depth of 1000 km in the Pacific.
dc.publisherAmerican Geophysical Union
dc.sourceGeophysical Research Letters
dc.subjectKeywords: Algorithms; Computerized tomography; Maps; Phase velocity; Seismographs; Statistics; Structural geology; Love wave; Neighbourhood algorithm; Shear wave velocity; Shear waves; algorithm; data set; Love wave; lower mantle; phase velocity; S-wave; seismic an
dc.titleGlobal Love wave overtone measurements
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume34
dc.date.issued2007
local.identifier.absfor040407 - Seismology and Seismic Exploration
local.identifier.ariespublicationu4353633xPUB125
local.type.statusPublished Version
local.contributor.affiliationVisser, K, Utrecht University
local.contributor.affiliationLebedev, S, Utrecht University
local.contributor.affiliationTrampert, Jeannot, Utrecht University
local.contributor.affiliationKennett, Brian, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpageL03302 1
local.bibliographicCitation.lastpage5
local.identifier.doi10.1029/2006GL028671
dc.date.updated2015-12-08T09:58:59Z
local.identifier.scopusID2-s2.0-34548099715
CollectionsANU Research Publications

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