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High-frequency Po/So guided waves in the oceanic lithosphere: II-heterogeneity and attenuation

Kennett, Brian; Furumura, Takahashi; Zhao, Yan

Description

In the western Pacific, high-frequency seismic energy is carried to very great distances from the source. The Po and So phases with observed seismic velocities characteristic of the mantle lithosphere have complex and elongated waveforms that are well explained by a model of stochastic heterogeneity. However, in the eastern part of the Pacific Basin equivalent paths show muted Po and weak, or missing, So. Once established, it is hard to eliminate such guided Po and So energy in the mantle...[Show more]

dc.contributor.authorKennett, Brian
dc.contributor.authorFurumura, Takahashi
dc.contributor.authorZhao, Yan
dc.date.accessioned2015-12-10T22:40:27Z
dc.identifier.issn0956-540X
dc.identifier.urihttp://hdl.handle.net/1885/57470
dc.description.abstractIn the western Pacific, high-frequency seismic energy is carried to very great distances from the source. The Po and So phases with observed seismic velocities characteristic of the mantle lithosphere have complex and elongated waveforms that are well explained by a model of stochastic heterogeneity. However, in the eastern part of the Pacific Basin equivalent paths show muted Po and weak, or missing, So. Once established, it is hard to eliminate such guided Po and So energy in the mantle lithosphere by purely structural effects. Even sharp changes in lithospheric thickness or complex transitions at fracture zones only weaken the mantle ducted wave trains, but Po and So remain distinct. In contrast, the effect of attenuation is much more severe and can lead to suppression of the So phase to below the noise level after passage of a few hundred kilometres. The differing characteristics of Po and So across the Pacific can therefore be related directly to the thermal state via the enhanced attenuation in hotter regions, such as the spreading ridges and backarc regions.
dc.publisherBlackwell Publishing Ltd
dc.sourceGeophysical Journal International
dc.titleHigh-frequency Po/So guided waves in the oceanic lithosphere: II-heterogeneity and attenuation
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume199
dc.date.issued2014
local.identifier.absfor040407 - Seismology and Seismic Exploration
local.identifier.ariespublicationu4027924xPUB402
local.type.statusPublished Version
local.contributor.affiliationKennett, Brian, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFurumura, Takahashi, University of Tokyo
local.contributor.affiliationZhao, Yan, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage614
local.bibliographicCitation.lastpage630
local.identifier.doi10.1093/gji/ggu286
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2015-12-09T10:59:21Z
local.identifier.scopusID2-s2.0-84906816677
local.identifier.thomsonID000342215600042
CollectionsANU Research Publications

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