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Antarctic Ice Properties Revealed From Teleseismic P Wave Coda Autocorrelation

Pham, Thanh-Son; Tkalčić, Hrvoje

Description

Antarctica is largely covered by an ice cap of a variable thickness characterized by relatively low density and seismic velocities. Passive seismological deployments have a limited use in imaging a thin ice layer because of the dominance of a relatively low‐frequency content in the teleseismic wavefield. Here we use passive seismological data and an improved autocorrelation method utilizing P wave coda to image the ice cover. The resulting autocorrelograms are interpreted as reflectivity...[Show more]

dc.contributor.authorPham, Thanh-Son
dc.contributor.authorTkalčić, Hrvoje
dc.date.accessioned2019-06-27T04:37:08Z
dc.identifier.issn2169-9313
dc.identifier.urihttp://hdl.handle.net/1885/164257
dc.description.abstractAntarctica is largely covered by an ice cap of a variable thickness characterized by relatively low density and seismic velocities. Passive seismological deployments have a limited use in imaging a thin ice layer because of the dominance of a relatively low‐frequency content in the teleseismic wavefield. Here we use passive seismological data and an improved autocorrelation method utilizing P wave coda to image the ice cover. The resulting autocorrelograms are interpreted as reflectivity records from a virtual source on the surface and reflection pulses at the ice base. We convert the reflection delay of P waves to the ice thickness measurements using a homogeneous P wave speed compatible with previous studies. Apart from P wave reflectivity, we obtain S wave reflectivity from the autocorrelation of radial component. The ratio of S wave and P wave reflection times represents a measurement of the P over S wave speed ratio (and Poisson's ratio). The successful application to unveil the Antarctic ice sheet properties presented here opens a way for future studies to measure properties of the ice cover in Antarctica, other continents, and icy planets in future space missions.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherWiley Blackwell
dc.rights© 2018. American Geophysical Union.
dc.sourceJournal of Geophysical Research: Solid Earth
dc.titleAntarctic Ice Properties Revealed From Teleseismic P Wave Coda Autocorrelation
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume123
dc.date.issued2018
local.identifier.absfor040407 - Seismology and Seismic Exploration
local.identifier.ariespublicationu5786633xPUB368
local.publisher.urlhttps://www.wiley.com/en-gb
local.type.statusPublished Version
local.contributor.affiliationPham, Thanh Son, College of Science, ANU
local.contributor.affiliationTkalcic, Hrvoje, College of Science, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue9
local.bibliographicCitation.startpage7896
local.bibliographicCitation.lastpage7912
local.identifier.doi10.1029/2018JB016115
local.identifier.absseo960306 - Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2019-03-24T07:20:44Z
local.identifier.scopusID2-s2.0-85053593644
CollectionsANU Research Publications

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